Class / Patent application number | Description | Number of patent applications / Date published |
324546000 | Winding or coil | 36 |
20080278175 | SYSTEMS AND APPARATUS FOR MONITORING INTERNAL TEMPERATURE OF A GRADIENT COIL - Systems, methods and apparatus are provided through which in some embodiments a thermal sensor of a magnetic coil of a magnetic resonance imaging system (MRI) is positioned, placed and/or mounted externally to the magnetic coil. The external placement of the thermal sensor does not require replacement of the entire magnetic coil, yielding less expensive replacement of a failed thermal sensor. | 11-13-2008 |
20090108849 | Method to detect shorted solenoid coils - A method for testing the continuity of a coil that is subjected to a high frequency pulse modulated current that includes sensing a coil voltage and comparing a ratio of the sensed coil voltage to the supply voltage to a threshold to determine whether the solenoid coil is functional. | 04-30-2009 |
20090219033 | Device for triggering an electromagnetic actuator and method for testing a first inductor of an electromagenetic actuator - In a device for triggering an electromagnetic actuator and a method for testing an inductor of an electromagnetic actuator, the inductor is connected to a test circuit in such a way that a resonant circuit is created, and an evaluation circuit is provided that evaluates at least one electrical parameter of this resonant circuit to determine whether the inductance lies within predefined tolerances. | 09-03-2009 |
20100201375 | DETERMINING SOLENOID HEALTH - A health monitoring arrangement for a solenoid includes
| 08-12-2010 |
20110031979 | IGNITION SYSTEM OPEN SECONDARY DETECTION - This document discusses, among other things, a system and method for detecting an open secondary condition in a secondary coil of an ignition coil using a control signal received from a control input of a switch configured to control the flow of current to a primary coil of the ignition coil. In an example, the flow of current in the primary coil of the ignition coil can be controlled using an insulated gate bipolar junction transistor (IGBT), and the open secondary condition in the secondary coil of the ignition coil can be detected using a received gate voltage of the IGBT. | 02-10-2011 |
20110089954 | STATION FOR DETECTING WINDING PRODUCTS AND METHOD FOR DETECTING INTER-TURN SHORT CIRCUIT - A detecting station of a winding product and a method for detecting an inter-turn short circuit are provided. The method includes following steps. First, a high voltage pulse is input to two ends of a winding of a winding product. Next, a voltage value of an electrifying process of the winding is extracted for generating an extracting data. Finally, a time-frequency converting operation is performed to the extracting data, and a time-frequency analysis information is generated for indicating whether or not the inter-turn short circuit is occurred in the winding. | 04-21-2011 |
20110163757 | ELECTRONIC LOAD SIMULATOR DEVICE FOR TESTING RF COILS - The invention relates to a magnetic resonance coil testing arrangement ( | 07-07-2011 |
20120206151 | FAULT DETECTION FOR LAMINATED CORE - A method of evaluating the condition of a laminated core of an electric machine including positioning a magnetic flux injection excitation yoke extending between a pair of teeth of the laminated core, and the excitation yoke being wound with an excitation winding defining an electrical circuit for producing a magnetic flux excitation. Power is supplied to an excitation winding wound around the yoke to produce a magnetic flux in the yoke and to form a magnetic circuit through the yoke and the laminated core. A characteristic of the electrical circuit of the excitation winding is measured to identify a fault in the magnetic circuit corresponding to an eddy current between individual laminations in the laminated core. | 08-16-2012 |
20130009650 | VOLTAGE DETECTOR, MALFUNCTION DETECTING DEVICE, CONTACTLESS POWER TRANSMITTING DEVICE, CONTACTLESS POWER RECEIVING DEVICE, AND VEHICLE - A voltage detector for detecting a voltage generated in a second resonant coil that is disposed to face a first resonant coil and that performs at least one of electric power transmission and electric power reception to and from the first resonant coil in a contactless manner by means of electromagnetic resonance includes: a first high-impedance element having one end connected to one end of the second resonant coil; a second high-impedance element having one end connected to the other end of the second resonant coil; a low-impedance element connected between the other end of the first high-impedance element and the other end of the second high-impedance element and having an impedance smaller than each of those of the first and second high-impedance elements; and an output terminal for outputting a signal associated with a voltage applied across the low-impedance element. | 01-10-2013 |
20130088241 | FAILURE DETECTING APPARATUS FOR SIGNAL DETECTION APPARATUS - A failure detecting apparatus that detects an isolation failure between a plurality of coils included in a signal detection apparatus. The failure detecting apparatus includes a voltage applying unit that applies a DC voltage to a coil in the plurality of coils; a differential signal generating unit that generates a differential signal from a voltage at the coil and a predetermined voltage; a threshold voltage setting circuit that outputs a threshold voltage; and a comparator that compares the differential signal with the threshold voltage, thereby detecting whether or not an isolation failure exists. The differential signal generating unit includes either first setting unit for setting an absolute value of the differential signal to be amplified with a predetermined gain or second setting unit for setting the predetermined voltage to be different from a ground potential, and the predetermined gain is set to a value different from one and zero. | 04-11-2013 |
20140354298 | APPARATUS AND METHOD FOR DETECTING PARTIAL DISCHARGE AT TURN-TO-TURN INSULATION IN MOTOR - Apparatus and method for partial discharge detection of turn-to-turn insulation in motor has a surge generator for generating a surge voltage to the windings of the motor by applying a pulse voltage, and a partial discharge current detector for detecting partial discharge currents between the winding turns of the motor. The surge generator generates in and between the windings of the motor the surge voltage that has the rise time and fall time corresponding to the rise time of the surge voltage observed at the motor terminal when the motor is driven by an inverter, and that is repeated at a frequency of 50 Hz to 20 kHz. | 12-04-2014 |
20150123675 | device for monitoring an operation of an inductive element - A device for monitoring an operation of an inductive element, includes a current-measuring device is switched in series with the inductive element. The device is configured to ascertain a first time-discrete and value-discrete signal, which characterizes a current flowing through the current-measuring device; to ascertain a second time-discrete and value-discrete signal, which characterizes a current flowing through the current-measuring device and has a predefinable time shift in relation to the first signal; and to infer the presence of a shunt from a comparison of the first signal with the second signal. Also described is a method for monitoring the operation of the inductive element. | 05-07-2015 |
20150309107 | METHOD AND SYSTEM FOR DETECTING HEALTH OF WINDINGS FOR ELECTROMAGNETIC DEVICES - The present disclosure provides a method and system for measuring an increase in wattage to detect a potential winding failure. The increase in watts in the winding occurs when a time-varying magnetic field from active turns of the winding induces a time-varying current on shorted turns of the winding. The resistance through the shorted turns and the induced current result in power usage and increased watts. The wattage increase is much greater than a resistance decrease in the winding by the shorted turns. Measuring the watts results in detecting a shorting winding with greater sensitivity than measuring the resistance. In one embodiment, the winding can be tested offline with a wattmeter and power supply. In another embodiment, the winding in use and its wattage can be monitored continuously or periodically locally or remotely, with an optional sensor to initiate a signal upon reaching a certain percentage increase in watts. | 10-29-2015 |
20160025798 | RF COIL STORAGE DEVICE AND RF COIL DEVICE - According to one embodiment, an RF coil storage device stores an RF coil device which receives a magnetic resonance signal from an object with a coil element in magnetic resonance imaging. This RF coil storage device includes a storage rack on which the RF coil device is placed, and processing circuitry configured to acquire an index signal which is used for determining presence/absence of a failure, from the RF coil device placed on the storage rack. | 01-28-2016 |
20160187411 | METHOD AND APPARATUS FOR ACTIVE LOAD IMPEDANCE MONITORING - An apparatus that includes a power amplifier; a load that is operatively connected to be electrically driven from the power amplifier; and an impedance monitor that is configured to in real-time identify a favorable segment within an output waveform of the power amplifier, model the baseline power spectral density of a load driven by the power amplifier during the identified segment of the output waveform, sample an empirical power spectral density of the load during the identified segment of the output waveform, and indicate a load fault in the event that the empirical power spectral density deviates from the baseline power spectral density beyond at least one pre-determined error criteria. | 06-30-2016 |
324547000 | Transformer | 21 |
20100026312 | System and Method for Power System Component Testing - A method of testing a power system component is disclosed. The method comprises coupling a test set to the power system component and displaying a test form on a display integral with the test set. The method also comprises inputting at least a first test control parameter into the test form using an interface integral with the test set. The method also comprises stimulating the power system component using the test set to produce a first response of the power system component, wherein the stimulating is performed based at least in part on the first test control parameter. The method also comprises displaying a first test result in the test form on the display, wherein the first test result is based on the first response. | 02-04-2010 |
20100231229 | LEAKAGE CURRENT COMPENSATION FOR HIGH VOLTAGE TRANSFORMERS - A method and system for measuring and compensating for a leakage current in a high voltage transformer. Such a method and/or system include the use of a primary winding and a secondary winding, which can be provided on a core of a soft-magnetic material. A current transformer can be placed about the leads to both the terminals of the primary winding. The current transformer can be utilized to reliably measure the leakage current flowing from the secondary winding to the primary winding through one or more amplifiers to a ground terminal. The leakage current flows back to the transformer secondary winding through a low-side current sense resistor. The total current monitor signal can be generated by the low-side current sense resistor and the leakage current measured by the current transformer is vector-subtracted from the total current monitor signal. The result is a current monitor signal fully representative of the high voltage transformer's actual load current. | 09-16-2010 |
20100259280 | APPARATUS FOR TESTING TRANSFORMERS - The invention relates to a device for testing transformers, having a static frequency converter ( | 10-14-2010 |
20100315095 | CURRENT TRANSFORMER AND ELECTRICAL MONITORING SYSTEM - A current transformer comprises a magnetic core having a closed central opening, at least two conductors extending through the central opening and positioned symmetrically within the magnetic core, and at least one set of winding turns wound around the core in a balanced configuration with respect to the at least two conductors. | 12-16-2010 |
20110012614 | low voltage and intense current phase-controlled switching on equipment - The present invention relates to low voltage electrical equipment testing technique, more particularly, to a low voltage and intense current phase-controlled switching on equipment, comprising: a frame, at least an vacuum arc extinguish chamber, at least a permanent magnet control device and at least a intelligent phase choosing controlled module, with the vacuum arc extinguish chamber and the permanent magnet controlled device mounted on the frame, wherein the vacuum arc extinguish chamber comprises at least a movable contact and a isolated pull rods connected to the movable contact, and the permanent magnet controlled device comprises electromagnetic coils, movable iron cores and output shafts connected to the movable iron cores, and a transmission system is arranged to connect to the isolated pull rod and the output shaft, with the intelligent phase choosing controlled module electrically connected to the electromagnetic coils of the permanent magnet controlled device. | 01-20-2011 |
20110031980 | SYSTEM FOR MONITORING A TRANSFORMER - This invention concerns a system for monitoring a transformer which comprises multiple terminals. The system includes multiple measuring devices and a transformer monitoring device. Each measuring device is arranged adjacently to a terminal of the transformer. Each measuring device includes a housing, a processing unit, a terminal to connect the processing unit to a sensing means to sense an electrical magnitude at the terminal of the transformer, and a data transmission terminal to transmit data between the processing unit and the transformer monitoring device. The transformer monitoring device, which is connected to the multiple measuring devices, is designed to determine, from a combination of the data from the multiple measuring devices, a present state of the transformer. | 02-10-2011 |
20110148431 | PROPERTY MONITORING APPARATUS FOR CURRENT TRANSFORMER OR ELECTRIC TRANSFORMER - The invention provides a property monitoring apparatus comprising a test current output circuit capable of varying an output current, a test current value computing means for computing a current value of a test current output from the test current output circuit, a test current control means for performing feedback control of the test current value computed via the test current value computing means to a target value, a measurement current detection circuit for measuring an output current value of the current transformer or the voltage transformer when the test current controlled to the target value via the test current control means is supplied, for storing a relationship between the output current value of the current transformer or the voltage transformer and the test current value for each target value by varying the target value of the test current via a predetermined pattern, and computing a correction coefficient for correcting a property of the current transformer or the voltage transformer based on the stored relationship. | 06-23-2011 |
20110267072 | DETECTOR OF TRANSFORMER INTERTURN SHORT CIRCUIT USING VOLTAGE DIFFERENTIAL - An improved internturn short circuit detection device of transformer via differential voltage comprises a single-phase transformer (TM). The single-phase transformer (TM) comprises a high-voltage coil (K) and a low-voltage coil (N). A voltage transformer (PT) is positioned at the high voltage side of the single-phase transformer (TM). Two branches of a tap (K | 11-03-2011 |
20120139555 | INSTRUMENT TRANSFORMER TEST EQUIPMENT AND METHOD - A method and apparatus for testing a transformer. A controller generates a switching signal and supplies the switching signal to a solid state switch in circuit with a test load of known magnitude, switching the solid state switch to place the test load in circuit with the transformer. A signal through or across the transformer is then measured. Methods and apparatus for testing a transformer comprise the controller and solid state switch placing a series of test loads of different known magnitudes in circuit with the transformer from the lowest magnitude to the highest, from the highest to the lowest, or both. Additionally, a test load array comprises a plurality of power resistors, a heat sink for accommodating the plurality of power resistors, and a material providing electrical insulation of the power resistors from the heat sink and thermal conductivity between the power resistors and the heat sink. | 06-07-2012 |
20120139556 | DEVICE FOR TESTING HIGH-VOLTAGE EQUIPMENT - An apparatus for testing a high-voltage equipment transformer or inductor has a filter transformer having a primary side connectable to line and a secondary side and a grounded electrostatic shield between the primary and secondary sides. A static frequency converter has a plurality of inputs connected to the filter-transformer outputs and a plurality of outputs. Respective capacitors each have one side connected to a respective one of the converter outputs and an opposite side connected star-fashion to a common ground. A matching transformer has a plurality of inputs connected to the capacitors and a plurality of outputs connectable to the transformer or inductor to be tested. | 06-07-2012 |
20120153964 | SYSTEM AND METHOD FOR DETECTING ISOLATION BARRIER BREAKDOWN - A circuit system includes a first circuit for receiving an input signal, a second circuit for interfacing with a user, a signal path connecting the first circuit to the second circuit, the signal path including a first isolator and a second isolator serially connected to the first isolator, and a capacitance detector that detects a change in a combined capacitance of the first and second isolators as an indicator of a breakdown of one of the first and second isolators. | 06-21-2012 |
20120169350 | TEST ACTUATOR FOR TAP CHANGER - The invention relates to a testing drive for examining a stepping switch or a tap changer as part of transformer tests, wherein the testing drive has a servomotor that acts on an adapter by means of a gear train, wherein the adapter can be connected to the upper gear stage of the stepping switch or tap changer during the tests. | 07-05-2012 |
20130221983 | SYSTEMS AND METHODS FOR PROVIDING TRANSFORMER RATINGS USING HARMONICS DATA - A method of providing transformer rating information. The method includes the steps of: (a) determining k-factors for eddy losses and stray losses related to a transformer; and (b) providing a revised rating for the transformer using the k-factors determined at step (a). | 08-29-2013 |
20130285671 | METHOD AND APPARATUS FOR PROTECTING POWER TRANSFORMERS FROM LARGE ELECTRO-MAGNETIC DISTURBANCES - A protective system far a power transformer having a neutral line connected to ground where large currents can flow in the neutral line due to electro-magnetic disturbances. The system includes circuitry for: (a) sensing the current level in the neutral line and whether it exceeds a predetermined threshold for a predetermined period; and (b) sensing and processing the harmonic content of the load current and determining the existence of certain relationships of the “even” and “odd” harmonics. Signals, including alarms, indicative of excessive conditions are produced. The system may also include circuitry for sensing the load current level and generating a signal alarm if the load level is above a giver) value when the harmonics and the DC current have values in excess of certain predetermined values. | 10-31-2013 |
20140049262 | APPARATUS AND METHOD FOR SAFE STATE RETENTION - A transformer core apparatus includes a body of highly magnetically permeable material, a permanent magnet arranged in a safe state position for saturating the body with a permanent magnetic field, and means for removing the permanent magnetic field from the body. | 02-20-2014 |
20140118003 | Fault diagnosis and preliminary location system and method for transformer core looseness - This invention publishes a fault diagnosis and location system for transformer core looseness, consists of vibration sensors, data collection and computer. It is of power transformer fault intelligent diagnosis technology technical field. Fault diagnosis and location method uses three vibration sensors positioned on the top of transformer tank, to obtain vibration signal, uses signal processing to analyze the signal, and obtains fault characteristics of the transformer core looseness. The characteristics respectively are 50 Hz, 150 Hz and 300 Hz frequency components, in which 300 Hz is main feature. When they reach a certain value at one position, it suggests that transformer core looseness near this position. By the comparison of differences among signals of three positions, fault location can be done. This invention manifests fault characteristics accurately and detects core looseness efficiently. | 05-01-2014 |
20140247056 | Method and Apparatus for Calibrating Voltage Transformer Serial Addition - A series summation-calibrating device based on a semi-insulating voltage transformer includes a symmetrical high voltage test power supply, a three-port serial voltage transformer, a semi-insulating voltage transformer and an error measuring apparatus. The present invention is characterized by: a complete set of equipment for measuring the traceability of power frequency voltage ratio can be manufactured; calibrating the line according to the serial addition based on the semi-insulating voltage transformer; measuring the relative error between the three-port serial voltage transformer and the semi-insulating voltage transformer; and mathematically processing the measuring result to obtain the voltage coefficient curve of the semi-insulating voltage transformer error. The method is easy to operate without being restricted by voltage level, and can establish, from a low voltage of 10V to a high voltage of 1,000V, a standard power frequency voltage ratio measurement system serving as a measurement standard at the national or provincial/ministerial level. | 09-04-2014 |
20150331033 | DEVIATION COMPENSATION METHOD OF POTENTIAL TRANSFORMER - A deviation compensation method of a potential transformer is provided. The deviation compensation method includes: providing a first voltage to first to Nth potential transformers respectively installed at different locations in a high voltage direct current (HVDC) transmission system; measuring voltage values output through the first to Nth transformers by the first voltage supplied; determining whether there is a deviation between the measured voltage values; and determining compensation values for correcting the measured voltage values to the same voltage value when there is the deviation. | 11-19-2015 |
20160054364 | POWER MONITORING SYSTEM FOR A POWER SYSTEM, AND POWER MONITORING DEVICE THEREOF - A power monitoring system includes a power monitoring device and a host. The power monitoring device includes: a plurality of meters, each generating an input detection signal that indicates an electric quantity inputted to a respective load; a detecting unit generating an output detection signal that indicates an electric quantity outputted to a transformer; a processing unit generating, based on the output detection signal and the input detection signals, a state indicator that indicates the presence or absence of energy theft; and a communication unit generating a communication signal that carries the state indicator. The host generates a warning output when the state indicator carried by the communication signal received thereby indicates the presence of energy theft. | 02-25-2016 |
20170234919 | OPTICAL SENSING METHODS AND SYSTEMS FOR POWER APPLICATIONS, AND THE CONSTRUCTION THEREOF | 08-17-2017 |
20180024180 | DEVICE AND METHOD FOR DETERMINING A PARAMETER OF A TRANSFORMER | 01-25-2018 |