| Entries |
| Document | Title | Date |
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| 20080309351 | High Voltage Insulation Monitoring Sensor - A sensor for condition monitoring the high voltage insulation of an electrical, generation, transmission or distribution system and/or an item of plant is described. The sensor comprises an impedance measurement unit that connects directly, via a single point of connection, to the electrical system to be tested. The electrical components of the impedance measurement unit are arranged so that high frequency partial discharge signals and low frequency power cycle information signal are preferentially transmitted through separate branches. Analysis of these separated signals thus enables extraction of information about the insulation of the electrical system being monitored. Safe operation of the sensor for users is also achieved through an opto-electronic circuit being employed to control the impedance measuring unit. | 12-18-2008 |
| 20090096464 | Electrical leakage detecting device for a fuel cell system - An electrical leakage determining circuit determines the occurrence of electrical leakage at a negative electrode of a fuel cell when a potential difference V between a positive electrode of the fuel cell and ground, which is detected by a potential difference detecting circuit, exceeds a preset potential difference threshold Vth, and determines the occurrence of electrical leakage at the positive electrode of the fuel cell when an insulation resistance R between the positive electrode of the fuel cell and ground, which is detected by a resistance detection circuit, falls below a resistance threshold Rth preset to be equal to or smaller than a resistance value Rw of a coolant. Upon determination of the occurrence of electrical leakage, the electrical leakage determining circuit opens a switching contact provided on a power supply line to interrupt power supply from the fuel cell to various power consumption components. | 04-16-2009 |
| 20090108850 | Insulation resistance decrease detector for industrial vehicle - An insulation resistance decrease detector for an industrial vehicle is disclosed. The detector includes a coupling capacitor, a sensing resistor, an AC voltage applying section having a first terminal and a second terminal, a voltage detecting section, and a determining section. The AC voltage applying section applies an AC voltage of a predetermined frequency to the vehicle body through the sensing resistor and the coupling capacitor. The voltage detecting section detects the voltage at a node between the sensing resistor and the coupling capacitor. The determining section determines that a resistance value of the insulation resistor has decreased when the level of voltage detected by the voltage detecting section becomes less than or equal to a predetermined level. | 04-30-2009 |
| 20090134881 | Insulation resistance detection system, insulation resistance detection apparatus and insulation resistance detection method - An insulation resistance determining system ( | 05-28-2009 |
| 20090201028 | EVALUATION METHOD OF INSULATING FILM AND MEASUREMENT CIRCUIT THEREOF - Provided is a method of evaluating dielectric breakdown by applying a current to an insulating film, in which measurement for a forward direction current and measurement for a backward direction current are performed in a short period of time. For this purpose two MOS diodes in which an electrode of one MOS diode and a base of another MOS diode are short-circuited respectively are prepared to form a circuit to which the current is applied, providing current flow in one insulating film reverse to current flow in another insulating film, which enables the application of both the forward direction current and the backward direction current. | 08-13-2009 |
| 20090251154 | System and method for testing winding insulation resistance - A power electronics system configured to determine a condition of a winding insulation is disclosed. The system may include at least one capacitor, and a first resistance coupled to the at least one capacitor. The system may further include a plurality of electronic switching devices coupled to at least the first resistance and the at least one capacitor, wherein the plurality of electronic switching devices are configured to selectively couple the at least one capacitor to a power source to charge the at least one capacitor during a first time interval and selectively couple the at least one capacitor to a second resistance during a second time interval. The system may further include a voltage measuring device configured to detect a change in voltage at a terminal of the at least one capacitor in response to the selective coupling of the at least one capacitor to the second resistance. The system may further include a computing system configured to determine a condition of the insulation based on the detection. | 10-08-2009 |
| 20090302862 | METHOD AND SYSTEM FOR MONITORING PARTIAL DISCHARGE WITHIN AN ELECTRIC GENERATOR - Electrical generators used for power generation typically operate at high voltage. The High operating voltage results in a severe electrical stress environment for the generator conductor insulation system. The high electrical stress cal lead to a phenomena such as corona, partial discharge and arcing that can cause damage to the insulation and conductors. Disclosed is a novel method and system of detecting partial discharge activity within an electric generator. The method employs at least two Rogowski loops non-contactingly surrounding individual iso-phase bus conductors, where the loops are wired in differential mode to detect fast moving electrical pulses indicative of partial discharge. | 12-10-2009 |
| 20090315566 | AC Current Sensor for Measuring Electric AC Current in a Conductor and an Indicator System Comprising Such a Sensor - The invention concerns a current sensor ( | 12-24-2009 |
| 20090315567 | ELECTRICAL CONDITIONING OF MEMS DEVICE AND INSULATING LAYER THEREOF - A method of fabricating a MEMS device includes conditioning of an insulating layer by applying a voltage across the insulating layer via a conductive sacrificial layer for a period of time, prior to removal of the conductive sacrificial layer. This conditioning process may be used to saturate or stabilize charge accumulated within the insulating layer. The resistance across the insulating layer may also be measured to detect possible defects in the insulating layer. | 12-24-2009 |
| 20100045303 | LOOP RESISTANCE TESTER CONTROL SYSTEM - A method is present for remotely controlling, monitoring, and analyzing loop resistance in a vehicle. A loop resistance test unit is positioned in the vehicle. A set of commands is sent from a monitoring unit to the loop resistance test unit over a wireless communications interface. Measurements are generated with the loop resistance test unit in response to the set of commands. The measurements are received from the loop resistance test unit at the monitoring unit in response to the set of commands send over the wireless communications interface. | 02-25-2010 |
| 20100045304 | METHOD OF TESTING INSULATION PROPERTY OF WAFER-LEVEL CHIP SCALE PACKAGE AND TEG PATTERN USED IN THE METHOD - A test element group (TEG) pattern formed of two wiring patterns alternately disposed in a swirl configuration is used for testing an insulation property of a wafer-level chip scale package (WL-CSP) having a micro wiring such as an inductor element. The insulation property of the WL-CSP can be monitored with enhanced accuracy by measuring a resistance value between solder terminals electrically connected to the swirl-shaped TEG pattern. | 02-25-2010 |
| 20100045305 | METHOD AND SYSTEM FOR PARTIAL DISCHARGE TESTING OF AN INSULATION COMPONENT - The disclosure relates to a method for partial discharge testing of an insulation component, wherein at least one X-ray pulse is applied to the insulation component, an AC voltage is applied to the insulation component and the partial discharge induced by the at least one X-ray pulse is measured, wherein the dose rate of the at least one X-ray pulse is at least about 10 | 02-25-2010 |
| 20100073012 | METHOD FOR DETECTING WATER LEAKAGE OF COIL AND WATER LEAKAGE DETECTOR APPLICABLE TO THIS METHOD - According to the present invention, a method of detecting water leakage in a coil, which determines whether or not cooling water leaks into an insulation layer, the water being supplied to a conductor of a coil covered with the insulation layer, including: applying an AC voltage to the conductor; bringing a surface electrode device into pressure contact with the insulation layer; grounding the surface electrode device through an impedance; measuring a potential of the surface electrode device; and determining that the cooling water leaks from the conductor into the insulation layer when a measured potential is higher than a potential of a normal coil | 03-25-2010 |
| 20100073013 | VALIDATION OF ARC FLASH DETECTION SYSTEMS - An arc flash validation unit may generate stimulus to be received by an arc flash detection unit (AFDU) and observe the response of the AFDU thereto. The response of the AFDU to the stimulus may allow for validation of the AFDU (e.g., validation that the AFDU is operating as expected). In addition, the arc flash validation unit may determine the response time of the AFDU. Different types of stimulus may be provided to the AFDU, including electro-optical (EO) stimulus (e.g., visible light), current stimulus, and the like. Results of the validation may be displayed on a human-machine interface, which may display an estimate of the total energy that would be released in an actual arc flash event. The estimate may be used to define appropriate safety parameters for the equipment monitored by the AFDU. | 03-25-2010 |
| 20100090708 | ELECTRIC DISCHARGE DETECTION METHOD AND ELECTRIC DISCHARGE MACHINING APPARATUS - An electric discharge machining apparatus having a gate signal generator for generating a gate signal, a power source for applying a voltage across a work gap formed between a tool electrode and a workpiece, a gap voltage detector for detecting a gap voltage of the work gap, an electric discharge detector for supplying an electric discharge detection signal representing electric discharge to the gate signal generator. The electric discharge detector includes a counter for generating a sample clock having a frequency greater than the frequency of the gate signal, and a comparator for receiving the gap voltage and determining that a fall in the gap voltage is larger than a specified voltage difference in each sample clock. The electric discharge detection signal is generated in response to an output signal of the comparator. | 04-15-2010 |
| 20100171511 | MOTOR INSULATION DETERIORATION DETECTION DEVICE - Disclosed is an insulation deterioration detection device that can accurately detect insulation deterioration in multiple motors by a simple circuit configuration. When detecting insulation deterioration, one end A of a smoothing capacitor is connected via a first switch to ground, and the other end B is connected via a second switch to motor windings; in this condition, link voltage is measured by a voltage measuring circuit provided in a converter unit, and the measured link voltage value is transmitted to a microcomputer in each inverter unit via serial communication. Current flowing via motor insulation resistance Z | 07-08-2010 |
| 20100194403 | PARTIAL DISCHARGE DETECTION SENSOR AND PARTIAL DISCHARGE DETECTION DEVICE USING THE SAME - A partial discharge detection sensor is used for detecting a partial discharge signal in a gas-insulated equipment using a PCB substrate, and a partial discharge detection device employs the partial discharge detection sensor. The partial discharge detection sensor includes a PCB substrate, a partial discharge signal detection pattern formed on the PCB substrate to detect a partial discharge signal in the gas-insulated equipment, and a connection terminal for receiving the partial discharge signal detected by the partial discharge signal detection pattern and transmitting the partial discharge signal to a connector that emits the partial discharge signal to the outside. The partial discharge detection sensor is attached to an inner wall of an enclosure of the gas-insulated equipment. | 08-05-2010 |
| 20100201376 | DETECTING ASYMMETRICAL TRANSISTOR LEAKAGE DEFECTS - A method of detecting low-probability defects in large transistor arrays (such as large arrays of SRAM cells), where the defects manifesting themselves as asymmetrical leakage in a transistor (such as a pulldown nFET in an SRAM cell). These defects are detected by creating one or more test arrays, identical in all regards to the large transistor arrays up until the contact and metallization layers. The test array(s) is (are) disposed side-by-side with the “normal” array(s) on the same reticle so that process variations that affect the normal array will also affect the test array. The contact and metallization layers for the test array are adapted to connect groups (sub-blocks) of transistors together in parallel for leakage testing. The group size is chosen to ensure that the leakage current associated with a single defective transistor is significantly greater than the aggregate leakage current associated with all of non-defective transistors in the group. Leakage is measured by applying an appropriate off-state voltage (e.g., 0V) by a common connection to all of the gates of the transistors in the test array, then measuring the aggregate drain/source leakage current, both forward and reverse (e.g., first grounded source and positively biased drain, then grounded drain and positively biased source) comparing the difference between the two leakage current measurements. The sub-blocks (groups) may be tested one at a time using a sub-block selection decoder to select the sub-block being tested. | 08-12-2010 |
| 20100225331 | Continuity testing apparatus and continuity testing method including open/short detection circuit - A continuity testing apparatus includes open/short detection circuits provided for to-be-tested terminals, respectively and configured to determine the presence or absence of at least any one of an open-circuit failure and a short-circuit failure in to-be-tested terminals. Then, the continuity testing apparatus generates detected results of the open/short detection circuits based on the condition of continuity of the to-be-tested terminals having connections to the open/short detection circuits and the detected results from the open/short detection circuits in the preceding stages, and outputs the generated detected results to the open/short detection circuits in the succeeding stages. Further, the continuity testing apparatus determines the condition of continuity based on the output from the open/short detection circuit in the last stage. | 09-09-2010 |
| 20100237877 | SYSTEM OPEN-CIRCUIT TESTING METHOD - A system open testing method is provided. Firstly, a system to be tested having at least an ESD protection unit, a signal input pad, a first voltage level end, and a second voltage level end is provided, wherein the first voltage level end and the second voltage level end are utilized for accessing electric power, the ESD protection unit has one end coupled to the signal input pad and the other end coupled to the first voltage level end. Afterward, a diode is connected to the signal input pad, and the conducting direction of the diode is opposite to that of the interior diode in the ESD circuit. Thereafter, a testing signal is send through the diode to the system. | 09-23-2010 |
| 20100237878 | LEAK CURRENT CALCULATION APPARATUS AND METHOD FOR CALCULATING LEAK CURRENT - A leak current calculation apparatus includes an acquiring section for acquiring partial circuit information, and a grouping section for forming a plurality of groups each comprising a part of the partial circuits connected with each other and for generating group information. The apparatus includes a leak difference value calculating section for calculating a leak difference value, which is a difference between a provisional maximum value acquired by adding up the maximum values of the leak current values of all the partial circuits and a sum of maximum values of the leak current values contained in the group information of the groups, and a maximum leak current calculating section for calculating the maximum leak current value of the integrated circuit by adjusting the provisional maximum value with the leak difference value. | 09-23-2010 |
| 20100308841 | CIRCUIT ARRANGEMENT FOR MONITORING AN ELECTRICAL INSULATION - A circuit configuration monitors the electrical insulation of an electrically conductive part in relation to a first pole and a second pole of an electrical power network for example, an electrical drive network in a hybrid vehicle. The circuit configuration is characterized in that between the electrically conductive part and the two poles, a voltage divider having at least two resistors is arranged in each case. A measuring unit is associated with each of the two voltage dividers and provided for measuring a partial voltage, which drops via at least one of the resistors. A switch unit is associated each with the two voltage dividers and is provided for alternately bypassing at least one of the resistors. | 12-09-2010 |
| 20100315096 | INSULATION RESISTANCE DETECTING APPARATUS - An insulation resistance detecting apparatus is provided to detecting an insulation resistance of a load circuit. The insulation resistance detecting apparatus comprises: a coupling capacitor of which a first end is connected to the load circuit; a periodic waveform output section which is connected to a second end of the coupling capacitor, and outputs a periodic waveform to the second end; a waveform shaping section which extracts and amplifies a part of the periodic waveform including a peak point; and an arithmetic operation section which determines the insulation resistance of the load circuit on the basis of a first wave height value as a wave height value of a waveform outputted from the waveform shaping section and a second wave height value as a wave height value of the periodic waveform. | 12-16-2010 |
| 20110006781 | INSULATION STATE DETECTOR - An insulation state detector includes a capacitor, a measurement section measuring a charging voltage of the capacitor, a measuring circuit that connects the capacitor, which is insulated from a DC power source after being charged by the DC power source, between the measurement section and a ground potential portion, a detector detecting an insulation state of a voltage boosting circuit, and a reversed-polarity measuring circuit that connects the capacitor to the measurement section and the ground potential portion with reversed polarity when a potential corresponding to a division ratio of a positive-side ground fault resistor and a negative-side ground fault resistor on a secondary side of the voltage boosting circuit exceeds a positive potential of the DC power source and the capacitor is charged with reversed polarity by a secondary-side positive potential at the time of charging of the capacitor using the positive potential of the DC power source. | 01-13-2011 |
| 20110006782 | INSULATION MONITORING OF SERVICING UNITS USED IN A POTROOM FOR THE PRODUCTION OF ALUMINUM BY IGNEOUS ELECTROLYSIS - A system permanently monitoring the insulation of a frame from its neighbors, comprising:
| 01-13-2011 |
| 20110012615 | Systems and methods for assessing standoff capabilities of in-sevice power line insulators - An electrical power transmission system includes electrical insulators arranged to electrically isolate live power lines. Measurement devices are physically incorporated or integrated in the insulator structures. The measurement devices measure and report insulator properties during live wire conditions. | 01-20-2011 |
| 20110012616 | Systems and methods for assessing standoff capabilities of in-service power line insulators - An electrical power transmission system includes electrical insulators arranged to electrically isolate live power lines. Measurement devices are physically incorporated or integrated in the insulator structures. The measurement devices measure and report insulator properties during live wire conditions. | 01-20-2011 |
| 20110037482 | Nondestructive inspection method of insulator using frequency resonance function - A nondestructive inspection method of testing insulators using frequency resonance function that can inspect an anomaly of an insulator by vibrating the insulator with a force having the characteristic of white noise, measuring the change in motion of the insulator according to the vibration and calculating the frequency resonance function of the insulator is disclosed. | 02-17-2011 |
| 20110057667 | METHOD AND APPARATUS FOR DETECTING DETERIORATION OF LIGHTNING ARRESTER - An apparatus for detecting deterioration of a lightning arrester includes: a high-frequency power supply; a pair of detecting terminals | 03-10-2011 |
| 20110068806 | VLF Test Generator - Disclosed is a very low frequency test generator for generating a high voltage having a low frequency in order to test the insulation of capacitive loads, in particular power cables. Said VLF test generator comprises an oscillator part which generates a high voltage that has a high frequency and is modulated with a lower frequency at an output, and a demodulator which is connected to the oscillator part, demodulates the high voltage, and recovers the low frequency therefrom. A discharge resistor for the capacitive load is connected in parallel to the demodulator, said discharge resistor conducting back to the aforementioned output. | 03-24-2011 |
| 20110084705 | INSULATION MEASURING APPARATUS - An insulation measuring apparatus, comprises: a measuring circuit including a first capacitor; a control unit that reads a voltage set on the first capacitor to decide an insulation state of a power supply, and control a path configuration of the measuring circuit; a switching section provided in a path located between the measuring circuit and the control unit; and a second capacitor provided between a ground and a path located between the switching section and the control unit. The control unit controls the path configuration of the measuring circuit, by turning ON the switching section to set a voltage corresponding to the voltage that is set on the first capacitor on the second capacitor, and then by turning OFF the switching section to read the voltage set on the second capacitor and to discharge an electric charge corresponding to the voltage being set on the first capacitor. | 04-14-2011 |
| 20110140714 | DETERMINATION OF INSULATION RESISTANCE OF AN ELECTRIC DC CIRCUIT - A method for determining an insulation resistance of an electric DC circuit having at least a first and a second terminal includes performing a measurement cycle, verifying whether the change of a measured current exceeds a predetermined change rate, calculating a total insulation resistance, and calculating a first insulation resistance between the first terminal and a reference potential and a second insulation resistance between the second terminal and the reference potential. An insulation resistance measurement circuit is also provided for carrying out the aforementioned method. | 06-16-2011 |
| 20110148432 | METHOD AND DEVICE FOR CHECKING THE ELECTRICAL INSULATION AS WELL AS A METHOD AND SYSTEM FOR PRODUCING PHOTOVOLTAIC MODULES - An electrical insulation test as well as the production of photovoltaic modules, especially of thin-film photovoltaic modules, provides a current-conducting component disposed on a panel-shaped substrate, which are insulated electrically in the area of the module edge. In order to simplify testing of the insulation of such photovoltaic modules, it is proposed that, during the production of the photovoltaic module, testing of the electrical insulation takes place, for which, through the use of a mechanical contacting device a test voltage is applied between the module edge on the one hand and the electrical connections of the photovoltaic module, which are remote from the module edge, lead to the outside, on the other hand. | 06-23-2011 |
| 20110156719 | ELECTRICAL INSULATION TEST APPARATUS - An electrical insulation test apparatus includes a cap having an indentation, and a conductive cushion arranged in the indentation. The conductive cushion has a receiving space sized to meet a tested photovoltaic panel. Since the conductive cushion is deformable, the conductive cushion will deform upon the size of the tested photovoltaic panel for completely contacting with peripheral surfaces of the tested photovoltaic panel when the tested photovoltaic panel is in the receiving space. | 06-30-2011 |
| 20110163759 | CIRCUIT FAULT DETECTING DEVICE AND METHOD - To detect accurately an insulation fault in a load circuit, Power supply lines and an electric heater (a load circuit) are connected by a detecting portion to detect a detected voltage (detected value) in accordance with the magnitude of a leakage current Id that flows through a ground between the power supply lines and the electric heater, and an evaluation as to whether or not there is a breakdown of insulation of the electric heater relative to the ground is performed by an evaluating portion based on the detected value obtained when the relay contact points are open. | 07-07-2011 |
| 20110181296 | ARC FAULT DETECTOR WITH CIRCUIT INTERRUPTER - There is here disclosed a method and apparatus for detecting the occurrence of arcing of a conductor by monitoring the current on an AC power line. The signal detected is split and directed along four separate paths to generate four signals having separate characteristics which represent the current in the line. A first path is for a signal representative of the current flowing in the line. A second path is for a signal having a pulse for each occurrence of a positive step change in current that is significant and has a di/dt value above a predetermined value. A third path is for a signal having a pulse for each occurrence of a negative step change in current that is significant and has a di/dt value above a predetermined value. A fourth path is for a signal having a voltage level representative of the broadband noise signal on the line. Using at least one of five different methods in combination with one of three input signals, a reference signal designated as “SINE” is generated. The SINE signal generated in combination with a CURRENT input is used to produce a control waveform “DELTA”. DELTA can be represented as a relative value or as an absolute difference between the SINE and the CURRENT. Each occurring half cycle of the DELTA signal is analyzed by, for example, a micro-controller for specific identifiable characteristics found to indicate the presence of arcing. Upon the detection of arcing, an output signal can be generated to activate a circuit interrupting mechanism, sound an audio alarm and/or alert a central monitoring station. | 07-28-2011 |
| 20110193563 | PARTIAL DISCHARGE MONITOR - This invention relates to high voltage electrical or power systems and in particular to a method and device for monitoring partial discharges in high voltage electrical or power systems. The method comprises defining a low trigger level and a high trigger level electrical pulse amplitude levels, monitoring at least one phase of the electrical system for an occurrence of a pulse within a defined minor time frame; detecting a peak amplitude of a pulse occurring in the electrical system within the minor time frame; determining if the detected peak amplitude of the pulse exceeds the lower and higher trigger levels; assigning a pulse number to the pulse if the peak amplitude of the pulse exceeds the trigger levels; capturing the pulse if the pulse number associated with the pulse is less than a predetermined pulse number threshold in the minor time frame; and storing the captured pulses in a memory. | 08-11-2011 |
| 20110227584 | INSULATION TEST METHOD FOR LARGE-SCALE PHOTOVOLTAIC SYSTEMS - In large-scale photovoltaic systems, it is not appropriate to use a conventional insulation monitor, since its test pulse is damped too much by the number and length of the feed lines. According to an embodiment of the invention, a remedy is provided here in that the photovoltaic system is subdivided through circuit design into multiple subsystems that are electrically insulated from one another, and the test pulse is transmitted to the connecting line associated with the applicable subsystem in sequential order. According to a second embodiment, the behavior of the current of the test pulse through the connecting lines is sensed by current sensors and evaluated in an analysis unit. | 09-22-2011 |
| 20110234238 | SIMULATION OF PRINTED CIRCUIT BOARD IMPEDANCE VARIATIONS AND CROSSTALK EFFECTS - A method for altering an impedance of a conductive pathway on a microelectronic package includes applying a magnetic field to the conductive pathway. The microelectronic package may be, for example, a printed circuit board. The method also includes controlling a magnitude of the magnetic field at the conductive pathway for altering the impedance of the conductive pathway. The magnetic field may be applied by, for example, an electromagnet or a permanent magnet. A magnetic field may also be applied for simulating crosstalk effects on a conductive pathway. | 09-29-2011 |
| 20110241696 | Method For The Simulation Of Defects With Spark Testers And Spark Testers - Method for the simulation of defects in the case of spark testers, in which breakdowns are recognized and displayed by a detector and added by means of a defect counter, wherein the high voltage is applied to a stationary standard spark gap and pulsed test voltages of predetermined level, duration and frequency are generated by the high voltage generator of the spark tester in short regular intervals. | 10-06-2011 |
| 20110241697 | INSULATION DIAGNOSIS METHOD, INSULATION DIAGNOSIS SYSTEM, AND ROTATING ELECTRIC MACHINE - An insulation diagnosis method according to the present invention includes: measurement step through which a signal generated at a diagnosis target device is measured; detection step through which a frequency or a frequency band manifesting a maximum amplitude signal strength is detected from the signal having been measured through the measurement step; and identification step through which an insulation defect type pertaining to an insulation defect having occurred in the diagnosis target device is identified based upon the frequency or the frequency band manifesting the maximum amplitude signal strength having been detected through the detection step. | 10-06-2011 |
| 20110254564 | System and Method for Detecting Voltage Dependence in Insulation Systems Based on Harmonic Analysis - A method of testing an insulation system is disclosed. The method comprises coupling a first test lead to a first conductor, the first conductor at least partly isolated by the insulation system and coupling a second test lead to a second conductor or a ground. The method further comprises applying a test signal to the first test lead, receiving a test response from the second test lead, and analyzing the test response from the second test lead to determine a harmonic content of the test response. The method further comprises, when the harmonic content is equal to or greater than a predetermined threshold, determining that the insulator system has non-linear properties. | 10-20-2011 |
| 20110285402 | METHOD AND SYSTEM FOR NON-DESTRUCTIVE DETECTION OF COATING ERRORS - The present invention relates to a method and a measuring arrangement for the non-destructive detection of coating errors in an electrically conductive substrate layer, which is coated with at least one electrically insulating cover layer. An input signal is inductively or capacitively input into the electrically conductive substrate layer by means of a signal input device. A measurement signal is output from the substrate layer via the cover layer by means of a signal output device. An evaluation unit is used to evaluate the output measurement signal. In this case, a coating error is detected when a signal parameter change of a signal parameter of the output measurement signal exceeds an adjustable threshold value. | 11-24-2011 |
| 20110291666 | DEVICE AND METHOD FOR DETERMINING PARTIAL DISCHARGES AT AN ELECTRICAL COMPONENT - The present invention relates to a method for determining partial discharges at an electrical component ( | 12-01-2011 |
| 20120025845 | SHORT CIRCUIT DETECTION IN AN INKJET PRINTHEAD - A short detection apparatus, system and method detect short circuits in an inkjet printhead using a comparison of measured current consumption and an estimate of current consumption based on print data. The apparatus includes a current sensor to measure current consumed by the printhead to eject a droplet of ink, a current estimator to estimate a current consumption of the printhead due to print data provided to the printhead, and a comparator to compare the measured consumed current to the estimated consumed current. A short circuit in the printhead is indicated when the comparison exceeds a predetermined threshold. | 02-02-2012 |
| 20120074955 | METHODS AND SYSTEMS FOR QUANTIFYING DEGRADATION OF WIRING INSULATION - A system for the measurement of degradation of electrical wire insulation quality is described. The system includes a clamping device for engaging the electrical wire to be tested for insulation degradation, the clamping device comprising a channel formed therein for placement of the electrical wire, a plurality of plates placed proximate the channel, the plates electrically connected to generate a capacitance and placed proximate the channel such that the wire insulation provides a portion of a dielectric for the generated capacitance, and a measurement device operatively attached to the plurality of plates such that the measurement device is configured to indicate an amount of degradation associated with the wire insulation based on at least one of the measured capacitance and dissipation factor. | 03-29-2012 |
| 20120086461 | DETECTION AND COMPENSATION OF MULTIPLEXER LEAKAGE CURRENT - A multiplexed input/output (I/O) system detects leakage currents on a selected input channel. The system includes a leakage detection multiplexer connected to provide an output selected from one of a plurality of input channels. In addition, the leakage detection multiplexer provides as part of the output measured leakage currents associated with the selected input channel. Based on the detected leakage currents, a determination can made regarding whether the detected leakage currents have compromised the integrity of the multiplexer output. In addition, the detected leakage current can be used to compensate the output provided by the multiplexer to account for the presence of leakage currents on the selected channel. | 04-12-2012 |
| 20120119754 | METHOD AND DEVICE FOR INSULATION MONITORING OF NON-GROUNDED ELECTRICAL DC AND AC GRIDS - Exemplary methods are directed to insulation monitoring of non-grounded electrical DC power supply systems and AC power supply systems which have a resistive (R | 05-17-2012 |
| 20120119755 | INSULATION RESISTANCE MEASUREMENT DEVICE AND INSULATION RESISTANCE MEASUREMENT METHOD - An object is to detect an insulation failure of a DC circuit with high sensitivity and in safety by means of a simple detection circuit. An insulation resistance measurement device of this invention is a device for measuring an insulation resistance to ground of a DC source circuit and is provided with connection terminals for connections to a positive electrode and a negative electrode of a series power supply, switch elements connected between the connection terminals and the ground potential and configured to switch connections between the connection terminals and the ground potential, resistive elements connected through the switch elements between the connection terminals, respectively, and the ground potential, and a voltage detection unit for detecting voltage drops in the resistive elements. | 05-17-2012 |
| 20120242348 | Device for Detecting Partial Discharge in an Insulation System of Rotary Electric Machines - A device for determining partial discharge in an insulation system of a rotating electrical machine with low capacitance decoupling has a coupler as a high pass and an adapter device connected or connectable to the coupler. The adapter device has a frequency separating filter for dividing a decoupled signal provided by the coupler into a high frequency signal and a low frequency signal. A mixer is provided for the high frequency signal and the low frequency signal for converting the high frequency signal. An output is provided where the converted high frequency signal is tapped for evaluation by an evaluation device connectable to the adapter device. | 09-27-2012 |
| 20120299603 | ON-LINE MONITORING SYSTEM OF INSULATION LOSSES FOR UNDERGROUND POWER CABLES - A monitoring system adapted to assess insulation losses of an underground power cable includes a cable circuit having first and second, spaced-apart terminals. The cable circuit is disposed along a section of the underground power cable. The system further includes a communications device adapted to transmit data gathered at the first and second terminals, and a processor adapted to receive and process the data measured at the same time with the synchronization device and transmitted from the communications device. | 11-29-2012 |
| 20120306510 | Method and System for Assessing Insulation Deterioration in Live Underground Power Cables - A method for assessing insulation deterioration in a live underground power cable may include, in one embodiment, attaching a coupling device to a live underground power cable and using the coupling device to couple a test signal onto the power cable. The power cable may carry a normal AC power signal at a first frequency, while the test signal may have a second frequency different from the first frequency. The test signal may be detected after it has traveled a distance along the power cable. It may then be analyzed to determine a change in velocity and/or attenuation of the test signal as a function of the normal AC power signal. The severity of water trees in the power cable may be inferred based on the magnitude of the change. | 12-06-2012 |
| 20120319699 | INSULATION DETERIORATION DIAGNOSIS APPARATUS - The invention is related to an insulation deterioration diagnostic apparatus for an electric path connected between an inverter device and an inverter-driven load device, including: a zero-phase current transformer having an annular magnetic core, a magnetizing coil wound around the magnetic core, and a detecting coil wound around the magnetic core, the transformer being for detecting a zero-phase current of an electric path; a magnetization control circuit for supplying an alternating current having a frequency at least twice as high as a drive frequency of the load device to the magnetizing coil to magnetize the magnetic core; and a frequency extracting circuit for extracting a frequency component identical to the drive frequency fd, from the output signal of the detecting coil, whereby precisely measuring a current leaking from an inverter-driven load device over a wide range of frequencies. | 12-20-2012 |
| 20130043881 | APPARATUS AND METHOD FOR IDENTIFYING HIGH RISK NON-CERAMIC INSULATORS (NCI) WITH CONDUCTIVE OR HIGH PERMITTIVITY DEFECTS - An apparatus and method for identifying the presence of high conductivity or permittivity conditions in a wide range of electrically insulating materials is disclosed. The apparatus includes a grounded enclosure containing electronics for controlling measurement and communication processes and first and second spaced-apart electrode assemblies for engaging an insulator to be tested. The first and second electrode assemblies are mounted in the enclosure for linear movement such that pressing of the first and second electrodes against an insulator causes the electronics to initiate a measurement. | 02-21-2013 |
| 20130234726 | PARTIAL DISCHARGE SENSOR FOR A HIGH VOLTAGE INSULATION MONITORING DEVICE - The present invention relates to a partial discharge sensor for a high-voltage insulation monitoring device comprising a housing and located in the housing a measurement circuit for measurement of partial discharges in a high voltage system to be tested and a coupling capacitor having one electrode connected to the measurement circuit and the other electrode to a first high voltage conductor to be connected to a high voltage line of the system to be tested, wherein it further comprises a calibration circuit located in the housing and comprising a calibration capacitor having one electrode connected to the calibration circuit and the other electrode connected to said first or a second high voltage conductor to be connected to a high voltage line. | 09-12-2013 |
| 20130257451 | DIELECTRIC STRENGTH VOLTAGE TESTING METHOD FOR ELECTRONICS DEVICE - A first X capacitor is connected between one of a plurality of hot line sections of a hot line that is located at an output side of a first relay as viewed from a commercial alternating-current power supply, and one of a plurality of neutral line sections of a neutral line that is located at an input side of a second relay as viewed from the commercial alternating-current power supply. A second X capacitor is connected between one of the hot line sections that is located at the output side of the first relay as viewed from the commercial alternating-current power supply, and one of the neutral line sections that is located at an output side of the second relay as viewed from the commercial alternating-current power supply. | 10-03-2013 |
| 20130271153 | ACTIVE MATRIX DEVICE AND METHOD OF DRIVING THE SAME - An active matrix electrowetting on dielectric (AM-EWOD) device includes a plurality of array elements configured to manipulate one or more droplets of fluid on an array, each of the array elements including a corresponding array element circuit. Each array element circuit includes a top substrate electrode and a drive electrode between which the one or more droplets may be positioned, with an insulator layer being interposed between the one or more droplets and the drive electrode; and write circuitry configured to write data to the array element. At least some of the array element circuits include measure circuitry configured to detect a pinhole defect in the insulator layer. | 10-17-2013 |
| 20130328571 | Method And Device For Insulation Monitoring Comprising A Signal Quality Display - A method and to a device for insulation monitoring in ungrounded electrical direct or alternating current networks includes coupling in a measuring signal between active conductors of the network to be monitored and ground and registration of measured values of the measuring signal. The registered measured value of the measuring signal is determined in the form of a signal quality value which is displayed on a display. | 12-12-2013 |
| 20140049264 | PROGNOSTICS SYSTEM AND METHOD FOR FAULT DETECTION IN ELECTRICAL INSULATION - A diagnostic/prognostics system for failure detection in an electrical insulation system is provided. The system includes at least two current transformers designed to detect high frequency component signals from the insulation system. The system also includes a data acquisition module coupled to the at least two current transformers, wherein the data acquisition module receives the high frequency component signals and analyzes the received high frequency component signals to identify one or more faulty components in the electrical insulation system. | 02-20-2014 |
| 20140084942 | System and Method for an Arc Fault Detector - Embodiments of the present disclosure include a method of operating an arc fault detection system, an arc fault detection system, and a system. An embodiment is a method of operating an arc fault detection system coupled to a power line, the method including determining one or more arc fault detection windows in power line signals on the power line, the power line signals comprising a communication signal and an alternating current (AC) power signal. The method further includes receiving the power line signals from the power line during the one or more arc fault detection windows, and performing arc fault detection processing on the received power line signals. | 03-27-2014 |
| 20140103939 | DETECTION OF AN INSULATION DEFECT - An electrical power supply device includes a DC voltage source with terminals, a controller, and an insulation-defect detecting device for detecting an insulation defect of the voltage source. The device has input terminals connected to source terminals, and circuits connected between respective input terminals and an intermediate point. The insulation-defect current-detection circuit connects between ground and the intermediate point. Both circuits have current-limiter circuits that open and close a connection between respective inputs and the intermediate point. Both current-limiter circuits are rated for traversal by a current of less than a standardized safety threshold when the first current-limiter circuit is closed and one of the terminals of the DC voltage source is shorted to ground. The control circuit is configured to simultaneously keep one current-limiter circuits open and the other closed. | 04-17-2014 |
| 20140125353 | HIGH PERFORMANCE SENSOR FOR PARTIAL DISCHARGE SIGNAL-ANALYZING SYSTEMS - A capacitor component is adapted for capacitive coupling to an electrical power apparatus in which a PD is suspected, such as a shielded power cable; and an impedance transformance device has an input side connected directly to the capacitor component. Together the two components are used as a sensor to pick up and convey PD signals to a PD signal-analyzing system. Although the two components inherently form a classic high-pass RC filter, in accordance with the invention the input impedance at the capacitor side is much greater than the output impedance at the signal-analyzing system side. The effect is to pass much more of the lower frequency components of the PD signal for analysis by the PD signal-analyzing system than if the tranformance device were not included. | 05-08-2014 |
| 20140232416 | SYSTEM AND METHOD FOR DETECTING AND LOCATING AN INSULATION FLAW IN A SOLAR GENERATOR ON A SPACE VEHICLE - A system and method for detecting and locating an insulation flaw in a solar generator on a spacecraft. The solar generator comprises a plurality of flaps. Each flap bears at least one solar cell that is connected to an electrical distribution network and electrically insulated from the flap. Each flap is connected, by a first load and by a second load, to a first electrical line and a second electrical line, respectively. The ratio of the impedances of the first load and of the second load of a flap being denoted as an impedance ratio of the flap. The solar generator comprises at least two flaps exhibiting different respective impedance ratios. The system comprises a component for evaluating the currents flowing in the first and second electrical lines, and a detector for detecting and locating an insulation flaw in the solar generator based on the evaluations of the currents. | 08-21-2014 |
| 20140266245 | Apparatus and Method for Insulation Testing of an Electrical Supply Network - An apparatus embodiment comprises a voltage source, a measuring device, a controller, and at least two connecting elements. The connecting elements connect to an electrical supply network comprising at least a phase conductor and a neutral conductor. The voltage source applies at least a first voltage and a second voltage to a pair of the conductors of the electrical supply network. The measuring device measures the resistance between the pair of conductors. The controller compares a first resistance measured by the measuring device between the pair of conductors to a predetermined first threshold resistance value and detects that an electric device is connected to the electrical supply network when the first resistance is lower than or equal to the first threshold. When an electric device is not detected, the controller is further configured to perform a higher voltage insulation test of the electrical supply network. | 09-18-2014 |
| 20140285214 | ELECTRICAL INSULATING PROPERTY TESTER, ELECTRICAL INSULATING PROPERTY TESTING METHOD AND ELECTRICALLY INSULATED WIRE PRODUCING METHOD - An electrical insulating property tester includes a guaranteed voltage applying unit for applying a guaranteed voltage to a running line provided with an electrical insulating layer around an electrical conducting wire, a grounding unit arranged downstream of the guaranteed voltage applying unit, for grounding the running line to thereby remove electric charge electrostatically induced on the running line, and a test voltage applying unit arranged downstream of the grounding unit, for applying a test voltage lower than the guaranteed voltage to the running line, to thereby detect a leakage current value. | 09-25-2014 |
| 20140292350 | FAILURE DETECTION APPARATUS FOR AN ELECTRICALLY HEATED CATALYST - The present invention is intended to detect insulation failure of an EHC. In the invention, a heat generation element of the EHC is electrically insulated by an insulating member. Then, a determination as to whether insulation failure has occurred is made based on an insulation resistance value of the insulating member at the time when an amount of water absorption in the insulating member is smaller than a predetermined amount of water absorption and when an amount of PM deposition in the insulating member is smaller than a predetermined amount of PM deposition, a change in the insulation resistance value of the insulating member at the time when the amount of water absorption in the insulating member decreases from an amount equal to or larger than the predetermined amount of water absorption to an amount smaller than the predetermined amount of water absorption, and a change in the insulation resistance value of the insulating member at the time when the amount of PM deposition in the insulating member decreases from an amount equal to or larger than the predetermined amount of PM deposition to an amount smaller than the predetermined amount of PM deposition. | 10-02-2014 |
| 20140306718 | Method And Device For Determining An Operating Parameter Of A Fluid Insulated Electrical Apparatus - A method for deriving at least one operating parameter of a fluid-insulated electrical apparatus, in particular of gas-insulated switchgear. The operating parameter is dependent on a dielectric breakdown strength of an insulation fluid of the electrical apparatus. The insulation fluid includes at least three components that are assigned to at least a first and a second component group such that at least one component group comprises at least two components. The component groups differ in their weighted average values of the molecular masses of the components in the respective component groups. At least one quantity which is indicative of the concentration of the first component group and of the concentration of the second component group is determined from the insulation fluid, e.g. by measuring one or more measurement variables with one or more sensors. The operating parameter is then derived using the at least one quantity. | 10-16-2014 |
| 20140320149 | DEVICE FOR DETECTING FAULT IN AN ELECTRIC LINE - A device for detecting faults in an electric line between a voltage source and a load is disclosed, The device includes a signal-generation unit a signal-receiving unit and an evaluation mechanism. The signal-generation unit is configured to produce a power-line signal and transmit the power-line signal via the electric line to an external mechanism. The signal-receiving unit is configured to receive a response signal from the external mechanism, The evaluation mechanism is configured to detect an occurrence of a fault, when the signal-receiving unit fails to receive a response signal. | 10-30-2014 |
| 20140333325 | TEST MODULE DEVICE AND A TEST METHOD FOR MONITORING THE STABILITY OF PROCESSES - The present invention discloses a test method for monitoring the stability of process and a test module device thereof. The test module device comprises: a substrate, a certain number of the first metal wires, a certain number of the second metal wires, an insulating block is disposed between the adjacent first metal wires. The method comprises: a preconfigured value of the test current in the test module is provided in the process; the multiple test module devices are provided. The present invention adopts a method adopting an offset to set the upper metal wire and lower metal wire in the test module instead of regular equal interval setting. Consequently, the safety zone of the overlay in the process can be determined. The present invention can monitor the stability of the process. | 11-13-2014 |
| 20140361789 | NON-CONTACT DISCHARGE EVALUATION METHOD AND NON-CONTACT DISCHARGE EVALUATION APPARATUS - The magnitude (charge quantity) and energy of discharge are obtained by optical measurement based on light emission, and are evaluated. A discharge source is caused to emit discharge light by applying a voltage to the discharge source from a known power supply, the intensity waveform of the discharge light emission is measured using a light receiving element, the waveform of discharge current is simultaneously measured using a current conversion probe or a current waveform detector, and a database is created in which a relation with analysis data sets obtained by analyzing the waveforms is recorded in consideration of applied power information. The intensity waveform of discharge light emission from a piece of equipment under measurement is measured using the light receiving element, and light emission data obtained by analyzing the waveform is compared with the data recorded in the database so as to estimate the magnitude of discharge as a value. | 12-11-2014 |
| 20150008939 | MEASURING LEAKAGE CURRENTS AND MEASURING CIRCUIT FOR CARRYING OUT SUCH MEASURING - An embodiment of a measuring circuit for measuring the leakage current flowing in a portion of an electronic device when said portion is biased by a biasing unit of the electronic device is proposed. The measuring circuit includes a first section configured to generate a threshold current, a second section configured to receive the leakage current, a third section configured to compare the threshold current with the leakage current, and a fourth section configured to generate an output voltage based on the comparison between the threshold current and the leakage current. Said first section is configured to set the value of said threshold current to a different value at each reiteration of an operating cycle. Said fourth section is configured to measure said leakage current based on a detection of a change in the value of the output voltage between two reiterations of the operating cycle. | 01-08-2015 |
| 20150015273 | Method For Determining An Electrical Property Of Cable Insulation - A method for determining conductivity of cable insulation of a cable including at least one conductor that determines the central axis of the cable and insulation layer surrounding the conductor longitudinally and radially includes steps of retrieving a cable sample from a cable, which sample includes a length of at least one insulation layer and preparing an insulation sample from the cable sample. The insulation sample is prepared from cable sample by cutting a circular layer having a set thickness at desired radius from the central axis of the cable. | 01-15-2015 |
| 20150022219 | INSULATION STATE DETECTING DEVICE - In a high-speed measurement mode, a high-voltage measurement mode (V0 measurement) is omitted and only a negative-pole side ground fault resistor voltage measurement mode (VC1n measurement) and a positive-pole side ground fault resistor voltage measurement mode (VC1p measurement) are performed. In the negative-pole side ground fault resistor voltage measurement mode (VC1n measurement) and the positive-pole side ground fault resistor voltage measurement mode (VC1p measurement), the charging time for the flying capacitor is set to a second predetermined time period that is shorter than a first predetermined time period, which is different from basic operations in a normal measurement mode. | 01-22-2015 |
| 20150028885 | METHOD FOR EVALUATION OF CABLE AGING DEGRADATION BASED ON SLICE SAMPLING - A method for evaluation of cable aging degradation based on slice sampling is revealed. An insulation layer of a cable is aged or degraded from the outside in under influence of high temperature, liquid immersion, radiation exposure, or other factors. The present invention gets slices as samples of the cable by cutting from the outside in. Then related tests including dielectric withstand test, insulation resistance measurement, elongation test, etc. are carried out. Besides the state of cable aging degradation being of the slice being found out, different positions in the insulation layer such as an outer layer, a middle layer and an inner layer can also be evaluated. | 01-29-2015 |
| 20150028886 | Circuit Arrangement For Generating a Test Voltage, in Particular For Testing The Insulation of Installed Cable - The invention relates to a circuit arrangement for generating a test voltage, in particular for testing electrical equipment, comprising an alternating voltage source or a voltage source having constant or essentially constant voltage and a circuit means connected to the voltage source for generating a preferably low-frequency alternating voltage U0. A power converter, preferably configured as a resonant converter, is connected to the alternating voltage source. A transformer device connected to the power converter is used for generating a high frequency UT, and a rectifier circuit means, in particular a cascaded and/or multistage one, is used for converting the high frequency to an amplitude that can be changed to a direct current voltage UHV. Furthermore, a switch device for charging the equipment being tested with the direct current voltage UHV and for discharging same is provided. In said circuit arrangement, the input of a converter is connected to the alternating voltage source U0 and the output of the converter is connected to the switch device for charging and discharging the equipment being tested. On the input side, the power converter is configured with (n) switch elements, and on the output side, the power converter comprises several (k) stages. The rectifier circuit means (C | 01-29-2015 |
| 20150054524 | Partial Discharge Measurement Device and Method - A partial discharge measurement device according to the present invention includes a frequency separation unit for separating a partial discharge signal which occurs in an apparatus under diagnosis and is detected by a sensor into the partial discharge signal and a main circuit voltage phase signal, an arithmetic device which receives the partial discharge signal and the main circuit voltage phase signal separated by the frequency separation unit and calculates a partial discharge signal synchronized with a main circuit voltage based on the partial discharge signal and the main circuit voltage phase signal, a power supply device for extracting a voltage obtained by dividing the main circuit voltage and supplying a power supply voltage to the arithmetic device, and a control unit for issuing an instruction for powering on or off at least the arithmetic device to the power supply device. | 02-26-2015 |
| 20150061696 | BATTERY PROTECTED AGAINST ELECTRIC ARCS - The invention relates to a DC electrical power supply source including
| 03-05-2015 |
| 20150061697 | IMPLANTABLE MEDICAL DEVICE AND METHOD FOR MONITORING THE INSULATION OF AN ELECTRODE LINE OF SUCH A MEDICAL DEVICE - An implantable medical device including at least one electrode line having an electrode pole, an electrode feed line, a counter electrode to the at least one electrode line, and an insulation sleeve. The insulation sleeve surrounds the electrode feed line and provides insulation between the electrode feed line and an electrolyte formed by bodily fluid. The electrode feed line and the electrode pole(s) include different materials, wherein the materials are different based on electrochemical series. The implantable medical device includes an insulation test unit having a DC voltage detector arranged between the electrode pole and the counter electrode, in order to detect an electrochemical voltage produced in the event of an insulation fault of the insulation sleeve due to defective contact between the electrolyte and the electrode feed line. | 03-05-2015 |
| 20150084643 | INSULATION INSPECTION METHOD AND INSULATION INSPECTION APPARATUS - An insulation test apparatus and method for a circuit board having a plurality of wiring patterns formed thereon includes: selection means for selecting wiring patterns to be tested, power supply means for sending a predetermined electrical output between a first object to be measured and a target object to be measured; measurement means for measuring an electrical signal between the first object to be measured and the target object to be measured; and calculation means for calculating the resistance of an insulation failure portion between the first object to be measured and the target object to be measured. | 03-26-2015 |
| 20150123676 | TEMPERATURE COMPENSATION OF INSULATION MONITORING FOR ROTATING MACHINES - A system includes a monitoring and/or protection system that includes an insulation derivation circuit. The insulation derivation circuit is configured to derive a first temperature compensation curve based on a first temperature and a first current, and the monitoring and/or protection system is configured to communicatively couple to a first current sensor configured to sense the first current traversing a first phase of a stator winding of a motor, a generator, or a combination thereof. The insulation derivation circuit is also configured to communicatively couple to a first temperature sensor configured to sense the first temperature of the stator when the stator is energized, and the temperature compensation curve is configured to map a temperature to a leakage dissipation factor. | 05-07-2015 |
| 20150137828 | Device for diagnosing a circuit arrangement - An apparatus for diagnosing a circuit arrangement for a short circuit and/or a line interruption. The circuit arrangement has at least two load circuits which are connected in parallel. A current measuring device for providing a current signal, which represents the current in the common supply line, is connected in a common supply line to the at least two parallel-connected load circuits. A voltage measuring device detect a node point voltage of each load circuit in the two switching states of the respective switching element. An evaluation device receives the current signal and the node point voltages, converts the current signal into at least one logic current value and the node point voltages into logic voltage values, and infers the type and location of the fault on the basis of prespecified combinations of the at least one logic current value and the logic voltage values. | 05-21-2015 |
| 20150293167 | INSULATION DETECTING DEVICE AND INSULATION DETECTING METHOD OF NON-GROUNDED POWER SUPPLY - An insulation detecting device includes a control unit configured to monitor a measurement voltage of a flying capacitor charged through a second path, and in a case where a measurement voltage is about 0 V (zero volt), control a switching of switches, control a charging of the flying capacitor through a third path and a measuring of a charged voltage of the flying capacitor charged through the third path, and measure a first measurement voltage in a first time after the switching to the third path and a second measurement voltage in a second time different from the first time, and a calculating unit configured to calculate a ground fault resistance formed between a direct-current power supply and a ground based on the first measurement voltage and the second measurement voltage. | 10-15-2015 |
| 20150346268 | CIRCUIT BOARD INSPECTING APPARATUS AND CIRCUIT BOARD INSPECTING METHOD - A circuit board inspecting apparatus is disclosed for inspecting a circuit board having wiring patterns separated from each other and forming a plurality of wiring pattern pairs. The apparatus includes a low-voltage inspection part to apply a first low-potential difference below a threshold voltage between wiring patterns in a first of the plurality of wiring pattern pairs, and to detect a first current flowing therebetween. A resistance measurement part is provided to measure a first resistance value between the wiring patterns of the first wiring pattern pair upon detection of the first current and a high-voltage inspection part is configured to selectively apply, based on the first resistance value, a high-potential difference above said threshold voltage, between the wiring patterns in a second of said plurality of wiring pattern pairs. | 12-03-2015 |
| 20150346269 | MOBILE HIGH-VOLTAGE TESTER - A mobile tester is provided for “Very Low Frequency” (VLF) testing of a measurement object, which has means for generating an AC voltage which has an effective amplitude of greater than or equal to 1 kV and a frequency in the range of between 0.01 and 1 Hz, a connection element for connecting the measurement object, and means for measuring and evaluating the test voltage applied to the measurement object and the test current caused thereby. In a first operating mode, the tester autonomously carries out a VLF test using the test voltage generated. The tester also has a communication interface for emitting a synchronization signal or for receiving an externally generated synchronization signal, and the tester is set up, in a second operating mode, to synchronize the generated test voltage with the test voltage generated by at least one further tester of the same type. | 12-03-2015 |
| 20150355256 | METHOD AND APPARATUS FOR DETECTING PARTIAL DISCHARGE WITHIN ELECTRICAL EQUIPMENT - A partial discharge detection apparatus detects a plurality of discharge events, finds a time interval between the plurality of discharge events, and determines, where the discharge events occur at a time interval shorter than a threshold time, that a partial discharge has occurred within a metal enclosure, or determines, where the discharge events occur only at a time interval longer than the threshold time, that a discharge has occurred outside the metal enclosure. The partial discharge detection apparatus can thus readily distinguish between a partial discharge that occurs within the metal enclosure of a gas-insulated switchgear and a discharge that occurs outside the metal enclosure. | 12-10-2015 |
| 20150355257 | CIRCUIT TESTING METHOD AND CIRCUIT TESTING SYSTEM - The present disclosure provides a circuit testing method and a circuit testing system for testing the circuit of a transmissive capacitive touch panel, wherein, the method comprises: when testing a certain induction line in a first electrode matrix or a second electrode matrix, configuring all induction lines in the first electrode matrix and the second electrode matrix except for the induction line to be tested as ground wires, applying a first voltage to the induction line to be tested, and detecting current on the induction line to be tested, and determining that the induction line to be tested is in a short-circuit state when the current is generated on the induction line to be tested; repeating the above step, and testing other induction lines in turn. | 12-10-2015 |
| 20150355263 | System and Method for Detecting Voltage Dependence in Insulation Systems Based on Harmonic Analysis - A method of testing an insulation system is disclosed. The method comprises coupling a first test lead to a first conductor, the first conductor at least partly isolated by the insulation system and coupling a second test lead to a second conductor or a ground. The method further comprises applying a test signal to the first test lead, receiving a test response from the second test lead, and analyzing the test response from the second test lead to determine a harmonic content of the test response. The method further comprises, when the harmonic content is equal to or greater than a predetermined threshold, determining that the insulator system has non-linear properties. | 12-10-2015 |
| 20160018453 | LEAKAGE CURRENT DETECTION DEVICE AND NONVOLATILE MEMORY DEVICE HAVING THE SAME - A leakage current detection device includes a test detection circuit, a reference detection circuit, a comparator, and a latch circuit. The test detection circuit is coupled between a test node and a test line, provides a voltage to the test node to charge the test line, floats the test node and the test line, and decreases a voltage of the test node based on leakage current of the test line. The reference detection circuit is coupled between a reference node and a reference line, provides the voltage to the reference node to charge the reference line, floats the reference node and the reference line, and decreases a voltage of the reference node based on self-discharge of the reference line. The comparator outputs a comparison signal by comparing voltages of the test node and the reference node. The latch circuit latches the comparison signal to output a test result signal. | 01-21-2016 |
| 20160018455 | LEAKAGE CURRENT SENSOR FOR SUSPENSION TYPE INSULATOR - A sensor apparatus for detecting leakage current in a suspension-type insulator of an electrical power system includes: a housing having a first half of a leakage current sensor contained therein; a door pivotally connected to the housing by a hinge, and having a second half of the leakage current sensor contained therein, the door pivotable about the hinge between an open position in which the first and second halves of the leakage current sensor are separate from each other, and a closed position in which mating surfaces of the first and second halves of the leakage current sensor join together to define a closed perimeter; and a clamping mechanism connected to the housing comprising a first jaw and a second jaw, wherein the jaws are moveable between an open position and a closed position. | 01-21-2016 |
| 20160054373 | INSULATION INSPECTION APPARATUS AND INSULATION INSPECTION METHOD - An insulation inspection technique for allowing the occurrence of sparks to be detected more satisfactorily and allowing a board in which sparks have occurred to be more satisfactorily detected as being detective is provided. An insulation inspection apparatus detects a voltage induced between insulation inspection target wiring patterns by the application of a voltage during a time period from the start of the voltage application between the insulation inspection target wiring patterns to a predetermined time when the voltage between the insulation inspection target wiring patterns has stabilized. When a voltage drop due to sparks occurring between the insulation inspection target wiring patterns is detected during the time period, the board to be inspected is determined to be defective. In particular, supply current during the time period is set in accordance with the number of inspection points of an upstream wiring pattern of the insulation inspection target wiring patterns. | 02-25-2016 |
| 20160072157 | INSPECTION METHOD FOR FILM COVERED BATTERY - A film covered battery ( | 03-10-2016 |
| 20160124036 | Real-Time Insulation Detector for Feeding High-Frequency Low-Voltage Signal of Power System - A real-time insulation detector for feeding a high-frequency low-voltage signal is electrically connected with a power system, and the power system includes a power circuit comprised of a main power circuit and plural branch circuits, a plurality of power transformers are arranged in the main power circuit and the plural branch circuits, and each current power transformer has a positive electrode point and a negative electrode point arranged on a low-voltage side thereof, the real-time insulation detector contains a central controller, a signal generator, a circuit selector, a plurality of detection circuits, plural first safety circuits, and plural second safety circuits. Thereby, the real-time insulation detector automatically feeds a high-frequency low-voltage detection signal, and when the power system runs in an uninterruptible power network, the central controller judges aging insulation comes from which one cable or component of the power system. | 05-05-2016 |
| 20160161543 | PARTIAL DISCHARGE DETECTION SYSTEM - A partial discharge detection system for detecting partial discharge events in an electrical component includes a transducer configured to receive a signal from the electrical component generated due to an occurrence of a partial discharge in the electrical component and responsively provide a transducer output signal to a signal processing chain A signal processing chain comprises one or more of the following. A filter coupled to the transducer filters the transducer output signal and responsively generating a filtered output. An amplifier coupled to the filter amplifies the filtered output and responsively provide an amplified output. A detector converts the amplified output to a detected baseband signal. A filter removes elements of the baseband signal that are not characteristic of partial discharge and outputs a filtered baseband output. A peak hold system matches the time scale of partial discharge events to the timescale of an analog to digital conversion process, resulting in a sampled, filtered, baseband signal. A digital signal processor performs a Discrete Fourier Transform (DFT) on the filtered baseband output and responsively generates a plurality of coefficients which correspond to a plurality of different modulation frequencies of the sampled, filtered, baseband signal. A controller identifies an occurrence of a partial discharge in the electrical component based upon the plurality of coefficients. | 06-09-2016 |
| 20160178690 | INSULATION INSPECTION METHOD AND INSULATION INSPECTION APPARATUS | 06-23-2016 |
| 20160187407 | ARC FAULT DETECTION SYSTEM AND METHOD AND CIRCUIT INTERRUPTER EMPLOYING SAME - A DC arc fault detection module includes a current detecting section having at least one output, wherein the current detecting section is structured to determine whether at least one signal based on a current measured from a DC supply line exceeds at least one corresponding predetermined threshold level and cause the at least one output to indicate that the threshold level has been exceeded. The module also includes a processing device structured to: (i) receive the at least one output, (ii) determine whether an arc fault in the DC electrical system has occurred based on at least the at least one output, (iii) determine an estimation of background noise based on at least one signal indicative of a current on the DC supply line, and (iv) adjust the at least one corresponding predetermined threshold level based on the estimation of background noise. | 06-30-2016 |
| 20160187408 | ARC FAULT DETECTION SYSTEM AND METHOD AND CIRCUIT INTERRUPTER EMPLOYING SAME - An AC arc fault detection module includes a current detecting section having at least one output and being structured to determine whether at least one signal based on a current measured from an AC phase line exceeds at least one corresponding predetermined threshold level and cause the at least one output to indicate that the threshold has been exceeded. The module also includes a processing device structured to: (i) receive the at least one output, (ii) determine whether an arc fault in the AC electrical system has occurred based on at least the at least one output, (iii) determine an estimation of background noise based on at least one signal indicative of a current on the AC phase line, and (iv) adjust the at least one corresponding predetermined threshold level based on the estimation of background noise. | 06-30-2016 |
| 20160252563 | SYSTEM AND METHOD FOR TESTING INSULATED JOINTS IN TRACK SYSTEMS | 09-01-2016 |
| 20160377670 | INSULATION DETECTOR AND ELECTRIC APPARATUS - An insulation detector for highly accurately detecting or measuring, with a simple configuration, insulation resistance of a load or an apparatus to a ground or a housing and connected to an electric apparatus including one or both of an intra-apparatus capacitor and a battery, the insulation detector including an intra-insulation detector capacitor, a voltage detecting unit that detects a voltage of the intra-insulation detector capacitor, and a current-path forming switch for connecting the ground or the housing, the intra-apparatus capacitor, and the intra-insulation detector capacitor in series and forming a current path including insulation resistance of the electric apparatus. The insulation detector measures the insulation resistance by measuring a time constant of a change in the voltage of the intra-insulation detector capacitor. A capacitance value of the intra-insulation detector capacitor is a value negligible in the measurement of the insulation resistance compared with a capacitance value of the intra-apparatus capacitor. | 12-29-2016 |
| 20170234922 | APPARATUSES, SYSTEMS AND METHODS FOR DETECTING CORONA | 08-17-2017 |
