| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 324521000 | By phase sensitive or responsive detection | 11 |
| 20090009180 | DIRECTIONAL FAULT CURRENT INDICATOR - A method for identifying a fault condition associated with a power line conductor of an electrical power distribution network. The method comprises determining a load current carried by the conductor is above a minimum load current, determining a learned phase angle relationship between the load current and a source signal, determining a load current magnitude, determining a real-time phase angle relationship between the load current and the source signal and indicating a fault condition when the real-time phase angle relationship is within a predetermined number of angular degrees of the learned phase angle relationship and when the load current magnitude exceeds a fault-indicating current. | 01-08-2009 |
| 20090243623 | SYSTEM AND METHOD FOR DETERMINING A POSITION OF A SINGLE PHASE FAULT TO GROUND IN A FEEDER LINE - A system and a method for determining a position of a single phase fault to ground in a feeder line are provided. The feeder line is electrically connected to an electrical substation via a substation bus. The system includes first and second sensors electrically coupled to a transformer in the electrical substation. The first sensor measures an amplitude and a phase angle of an electrical current being output by the transformer to the substation bus electrically connected to the feeder line. The second sensor measures an amplitude and a phase angle of a voltage being output by the transformer to the substation bus electrically connected to the feeder line. The system further includes a processor that determines a reactance value based on the amplitude of the electrical current, the amplitude of the voltage, a phase angle between the electrical current and the voltage, and a predetermined constant. The processor accesses a table having a plurality of position identifiers associated with positions on the feeder line, and a plurality of reactance component values corresponding to reactance components of Thevenin impedances at the positions on the feeder line relative to the substation bus. The processor selects a first reactance component value from the plurality of reactance component values in the table that substantially corresponds to the reactance value. The processor selects a first position identifier from the plurality of position identifiers that is associated with the first reactance component value. | 10-01-2009 |
| 20100176814 | APPARATUS AND METHOD FOR MONITORING A PHASE LINE OF A SECTION OF AN ELECTRICAL ENERGY TRANSMISSION LINE - An appliance and a method are intended to monitor a phase line of a section of an electrical energy grid line. The appliance comprises a device for monitoring a parameter of a phase line. The parameter is representative of routine operating conditions of the phase line and has a known propagation speed. The appliance also comprises a device for generating an event detection signal each time the parameter has a value that exceeds a threshold, and for storing a reception time when the detection signal is generated. The appliance also has a device for sending a signal representative of a geographic location of the end of the section and a device for performing a geographic location of the event once two consecutive detection signals are generated from the signal representative of the geographic location, and reception times associated with the two detection signals. | 07-15-2010 |
| 20100277181 | METHOD AND DEVICE FOR FAULT LOCATION IN A TWO-TERMINAL TRANSMISSION OR DISTRIBUTION POWER LINE - A method for locating a fault in a two-terminal power transmission or distribution line. Measurements of the three phase currents are received from both terminals. Measurements of the three phase voltages are received from one line terminal. Parameters of the line are received. The fault type is received. Based on this received information the distance to fault from the one terminal where the phase voltages were measured is determined and output. Since only the phase voltages of one line terminal are needed, the functionality of a device, in particular a current differential relay, can be expanded to determine the distance to fault in an off-line mode. | 11-04-2010 |
| 20100301872 | Method for Determination of a Setting Value Which Indicates a Ground Impedance, and Measurement Device - A method for determining an adjustment value for an electrical protection device wherein, upon occurrence of a ground short circuit, first current indicator measured values and first voltage indicator measured values are captured by a first measurement device at a first end of a segment of an electrical power supply line, and second current indicator measured values and second voltage indicator measured values are captured by a second measurement device at a second end of the segment of an electrical power supply line. In order to design a method of this type such that an adjustment value for a ground impedance can be determined in a relatively simple fashion. A fault location value is determined using the first current and voltage indicator measured values and the second current and voltage indicator measured values, indicating a fault location at which the ground short circuit has occurred in the segment of the electrical power supply line, and an adjustment value indicating a ground impedance is calculated using the fault location value. There is also provided a correspondingly equipped measurement device. | 12-02-2010 |
| 20110057661 | APPARATUS AND METHOD FOR IDENTIFYING A FAULTED PHASE IN A SHUNT CAPACITOR BANK - An apparatus and method is provided for identifying a faulted phase in at least one shunt capacitor bank. The apparatus generally includes a sampling circuit for sampling current or voltage signals associated with the shunt capacitor bank. A microcontroller is coupled to the sampling circuit and programmed to measure a compensated neutral point phase angle from the sampled signal, and compare the compensated neutral point phase angle with a fixed reference phase angle to identify the faulted phase of the shunt capacitor bank. The method generally includes the steps of sampling a current or voltage signal associated with the shunt capacitor bank, determining a compensated neutral point phase angle from the sampled signal, and comparing the compensated neutral point phase angle with a fixed reference phase angle to identify the faulted phase of the shunt capacitor bank. The invention also relates to an apparatus and method for identifying the location of the fault (e.g., the section of the bank) in a double ungrounded shunt capacitor bank or double WYE shunt capacitor bank. | 03-10-2011 |
| 20110254562 | METHOD AND DEVICE FOR DETECTING SHORT-CIRCUITS IN THE STATOR CORE OF ELECTRIC MACHINES - A method for detecting turn-to turn faults in a laminate stack of a stator of an electrical machine or a generator includes magnetizing the stator using an auxiliary coil and an auxiliary current so as to form a magnetic field. The magnetic field is measured using a pickup device including at least two detectors disposed in at least two respective different radial positions with respect to a rotor axis so as to provide at least two signals corresponding to the magnetic field at the respective radial positions. The method includes evaluating and comparing a magnitude and/or a phase angle of the signals so as to determine a relative magnitude and/or relative phase angle by subtraction in order to detect turn-to-turn faults. Relative differences in the at least two signals are recorded. Also a device for performing the method. | 10-20-2011 |
| 20130187662 | DETERMINATION OF THE LOCATION OF AN ELECTRICAL DISTURBANCE - According to an embodiment of the present invention, an apparatus for determining the location of an electrical disturbance in a circuit is provided. The apparatus has at least one sensor configured to determine the relative phase of current and voltage waveforms across the circuit inductance of a portion of the circuit produced by a voltage or current perturbation, and a controller configured to identify the location of the electrical disturbance within the circuit from the relative phase of the current and voltage waveforms. | 07-25-2013 |
| 20130328569 | Method And Arrangement For An Internal Failure Detection In A Y-Y Connected Capacitor Bank - A method for detecting an internal failure in a capacitor bank connected to a power system, wherein the capacitor bank includes a plurality of capacitor units that are divided into two Y sections. Each phase in each of the Y sections define a leg and each leg includes series and/or parallel-connected capacitor units. The internal failure may occur in one or more capacitor elements or units or involve one or more legs. The method includes measuring the phase current in one of the phases, calculating the root mean square value, denoted by RMS, of the measured phase currents, measuring the unbalance current between the two sections, calculating the RMS value of the measured unbalance currents, and detecting the phase angle between the measured phase current and the measured unbalance current. | 12-12-2013 |
| 20140002098 | LOCATING OF PARTIAL-DISCHARGE-GENERATING FAULTS | 01-02-2014 |
| 20140361785 | Fault Detection in Subsea Power Cables - A method of detecting a fault in a subsea power cable or in a direct electric heating system including a subsea power cable is provided. Measuring points are distributed along the subsea power cable. The method includes measuring at each measuring point a current in the subsea power cable and comparing the currents measured at the different measuring points. | 12-11-2014 |
