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| Number | Title | Issue Date |
| 8022709 | Method and apparatus for determining circular characteristic A method and a system for determining a circular characteristic for distance protection of a three-phase electric line, the system comprising means for detecting a fault on the electric line, means for identifying a faulted phase or phases of the electric line, mean... | 09/20/2011 |
| 7973537 | Corrective device protection A control system for an electrical power system includes an electrical corrective device, a voltage measuring device coupled to each phase of the electric power system, a current measuring device connected between each phase of the electric power system and the elec... | 07/05/2011 |
| 7969155 | 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 determines if a load current carried by the conductor is above a minimum load current, determines a learned phase angle relation... | 06/28/2011 |
| 7786735 | Corrective device protection A control system for an electrical power system includes an electrical corrective device, a voltage measuring device coupled to each phase of the electric power system, a current measuring device connected between each phase of the electric power system and the elec... | 08/31/2010 |
| 7746080 | 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 co... | 06/29/2010 |
| 7498821 | Non-linear observers in electric power networks In order to make accurate predictions on whether or not a power grid is stable, it is desirable to know the frequency and phase of at least each “control area” in the power grid. Each control area will ideally have power generation matched with its load. Rather ... | 03/03/2009 |
| 7345488 | Apparatus and method for determining a faulted phase of a three-phase ungrounded power system Provided is an apparatus and method for determining a faulted phase resulting from a fault in a three-phase ungrounded power system. The method includes comparing a phase angle of an operating phasor to a phase angle of a fixed reference phasor. The operating phasor... | 03/18/2008 |
| 7339389 | Semiconductor device incorporating characteristic evaluating circuit operated by high frequency clock signal In a semiconductor device, a main circuit is operated by a first clock signal, and at least one characteristic evaluating circuit is operated by a second clock signal whose frequency is higher than a frequency of the first clock signal. Also, at least one deteriorat... | 03/04/2008 |
| 7319576 | Apparatus and method for providing differential protection for a phase angle regulating transformer in a power system Provided is an apparatus and method for providing differential protection for a phase angle regulating transformer having a load side and a source side in a three-phase power system. The method includes calculating a first positive sequence component and a first neg... | 01/15/2008 |
| 7301323 | Quench detection method and apparatus of superconductive conductor When supplying electric power to a superconducting cable including a superconducting shield covering a superconductive conductor, a phase A of a current generated by a magnetic field leaking from the superconducting shield and a phase B of a current passing through ... | 11/27/2007 |
| 7298149 | Fault location using measurements of current and voltage from one end of a line A method to locate a fault from one end of a section of a power line utilizing measurements of current, voltage and angles between the phases at a first end of said section. Symmetrical components of currents are calculated for the current and voltage measurement at... | 11/20/2007 |
| 7299143 | Method and apparatus for improving operational reliability during a loss of a phase voltage The present invention is directed to a method and apparatus for improving operational reliability during a loss of a phase voltage (LOV) in a multi-phase power system, wherein a voltage representative of the LOV phase is calculated. The representative voltage is use... | 11/20/2007 |
| 7283915 | Method and device of fault location The present invention relates to a method for location of a fault utilizing unsynchronized measurements of three phase voltages and currents acquired at the line terminals without synchronization. Phasors for symmetrical components of the measured quantities are det... | 10/16/2007 |
| 7253633 | Threshold adjustment accuracy for ground fault condition determination A polyphase power system with a system safety ground supplies a plurality of power phases over a respective plurality of power lines to power a load. A plurality of phase fault detectors of a fault detection component monitor the plurality of power lines, respective... | 08/07/2007 |
| 7221166 | Fault location using measurements from two ends of a line The present invention relates to a method to locate a fault in a section of a transmission line using measurements of current, voltage and angles between the phases at a first (A) and a second (B) end of said section. The invention is characterised by the steps of, ... | 05/22/2007 |
| 7221140 | Circuit, method and system for providing one or more phase voltages from input voltages The present invention provides a phase voltage circuit. In one embodiment, the phase voltage circuit includes a line voltage stage coupled to at least three input voltage lines and configured to provide at least two corresponding line voltages. Additionally, the pha... | 05/22/2007 |
| 7221548 | Residual-current circuit breaker and a method for testing the reliability performance of a residual-current circuit breaker A test circuit is provided, which is independent of a power supply and which enables a circuit breaker to be tested in a reliable manner. The test circuit includes a test coil which is devoid of electric potential and is wound around a totalizing current transformer... | 05/22/2007 |
| 7200502 | Dual connection power line parameter analysis method and system A method and apparatus is disclosed for determining the power line parameters of a system. Specifically, there is provided a method comprising perturbing a voltage waveform through a first connection, measuring a characteristic of the perturbation through a second c... | 04/03/2007 |
| 7199589 | Method for controlling a switching converter and control device for a switching converter A method and a device is provided for controlling a switching converter comprising a high side switch and a low side switch. The method comprises testing the high side switch for a short circuit, and upon detection of a short circuit in the high side switch, leaving... | 04/03/2007 |
| 7170405 | Method and apparatus for interfacing a power line carrier and an appliance A method and apparatus for communicating between an appliance and a power line carrier communication system includes at least one power line carrier connection, at least one appliance connection, and processing circuitry for translating between an appliance communic... | 01/30/2007 |
| 7164238 | Energy savings device and method for a resistive and/or an inductive load and/or a capacitive load An energy savings device for an inductive, a resistive or a capacitive load, such as a fluorescent light fixture having a magnetic ballast or an electronic ballast, which is powered by an AC voltage waveform. The energy savings device includes a setting unit for set... | 01/16/2007 |
| 7126324 | Precision digital phase meter A method of measuring phase includes receiving an analog signal; converting the analog signal into a digital signal; representing the digital signal as N sets of samples; aligning the N sets of samples to a common time frame; removing zero bias drift from the digita... | 10/24/2006 |
| 7123459 | Protective relay capable of protection applications without protection settings The current differential relay operates without adjustable settings, and includes a phase current differential element with a predetermined threshold, responsive to local phase current values and remote phase current values, to detect three-phase faults and producin... | 10/17/2006 |
| 7106565 | Directional ground relay system A directional ground relay (50) for receiving electric values relating to voltage and current from a power transmission line (1) to be protected. The directional ground relay may decide a direction of a fault in the power transmission line based upon t... | 09/12/2006 |
| 7081756 | Substrate inspection apparatus, substrate inspection method, method of manufacturing semiconductor device and recording medium A substrate inspection apparatus includes a first waveform measurer which acquires a first amplitude waveform that is the amplitude waveform of an AC voltage obtained from a semiconductor of a semiconductor substrate which is being inspected when an external AC powe... | 07/25/2006 |
| 7079961 | Method and apparatus for measuring impedance of electrical component under high interference conditions A test system and method having a test channel and an additional channel, and wherein the ratio of amplitude and phase between the interference current through the device under test and the interference signal on the additional channel are determined. The system fur... | 07/18/2006 |
| 7053626 | Device and method for monitoring the connection of an electrical supply unit The invention relates to a device and a method for monitoring the connection of an electrical supply unit comprising voltage detection (32) detecting phase voltage (14), current detection (32) detecting phase voltages (38), a transformati... | 05/30/2006 |
| 7043379 | Method for quantifying I/O chip/package resonance A method for quantifying effects of resonance in an integrated circuit's power distribution network is provided. The power distribution network includes a first power supply line and a second power supply line to provide power to the integrated circuit. Test ranges ... | 05/09/2006 |
| 7023196 | High level arc fault detector Apparatus and methods for detecting high level arc faults in aircraft power systems are disclosed. One embodiment of the invention with reduced susceptibility to nuisance trips includes three low pass filters each having an output connected to a threshold detector. ... | 04/04/2006 |
| 7016775 | Controller and control method for an electric power steering apparatus A controller controls an electric motor to provide assist power corresponding to steering operation for an electric power steering apparatus. The controller comprises a detecting device, a filtering device, a judging device and a determining device. The detecting de... | 03/21/2006 |
| 6998848 | Method for producing a fault signal which indicates a short to ground A method and apparatus for producing a fault signal are disclosed which indicate a short to ground on a polyphase power transmission line, in which, the phase currents on the power transmission line are detected by means of current transformers in order to form a su... | 02/14/2006 |
| 6989678 | Determining the dielectric properties of wood A wood drying installation for a wood drying kiln including a pair of electrodes adapted to be inserted into a wood stack contained in the kiln, a resistance connected in a series circuit with the electrodes, an AC voltage source connected to apply an AC voltage acr... | 01/24/2006 |
| 6975312 | Computer system having network connector and method of checking connection state of network cable therefor A computer system having a network connector to which a network cable is connected, including a displaying part displaying a connection state of the network cable; a signal processing part processing a signal inputted through the network connector; and a control par... | 12/13/2005 |
| 6959037 | System and method for locating and determining discontinuities and estimating loop loss in a communications medium using frequency domain correlation A system for determining characteristics associated with a communication channel includes a transmitter for transmitting a first signal via the communication channel. The system includes a receiver for receiving a second signal via the communication channel in respo... | 10/25/2005 |
| 6904390 | Method, computer program, and system for automated real-time signal analysis for detection, quantification, and prediction of signal changes A method, computer program, and system for real-time signal analysis providing characterization of temporally-evolving densities and distributions of signal features of arbitrary-type signals in a moving time window by tracking output of order statistic filters (als... | 06/07/2005 |
| 6895349 | Gate comparator A gate comparator control panel, in accordance with the subject invention, allows a user to define up to four different gate regions that may exist on any of the live waveforms, maths waveforms, or REF waveforms. A menu for each gate controls the position of each ga... | 05/17/2005 |
| 6867596 | Fault detection system A system and method for fault detection including a transmitter adapted to transmit a composite signal on a buried cable so that fault leakage of the composite signal returns to the transmitter through the ground surrounding the buried cable. The composite signal is... | 03/15/2005 |
| 6859025 | Measurement of quantities of electric line A method and apparatus for measuring quantities of a multi-phase electric line, the apparatus comprising a control unit and a measurement unit in connection with each phase conductor of the electric line, wherein each measurement unit is arranged to measure a first ... | 02/22/2005 |
| 6833711 | Protective relay for powers systems having dependable out-of-step blocking capability The apparatus detects an out-of-step condition following the clearing of an external multi-phase fault in a protective relay. The apparatus includes a circuit which detects the presence of an external multi-phase fault on the power line and a timing circuit for read... | 12/21/2004 |
| 6815957 | Method and device for inspecting laminated iron cores of electrical machines for interlamination shorts The present invention relates to a method, an apparatus and a computer program for inspecting laminated iron cores (1) of electrical machines for interlamination shorts, in which the laminated iron core (1) is magnetized by means of an auxiliary windin... | 11/09/2004 |
