Fault Location Patents (Class 702/59)
  • Patent number: 11300600
    Abstract: In accordance with one or more embodiments, a system is provided. The system includes feeders, sensors, and a controller. The feeders connect a panel to a generator and a load. The sensors are on the feeders. The controller receives sensor signals from the sensors. The controller evaluates the sensor signals to determine a fault location.
    Type: Grant
    Filed: March 18, 2020
    Date of Patent: April 12, 2022
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: John F. Defenbaugh, Jef William Good, Joshua Berg
  • Patent number: 11280834
    Abstract: The present disclosure relates to determining locations of low-energy events on power lines. For example, an IED may receiving an input signal indicating a local electrical condition of a power line. The IED may detect traveling waves on the power line based on the local electrical condition. The IED may detect traveling waves on the power line based on the local and remote electrical conditions. The IED may determine that the traveling waves are associated with a low-energy event. The IED may determine the location of the low-energy event on the power line based at least in part on the traveling waves.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: March 22, 2022
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Armando Guzman-Casillas, Veselin Skendzic, Mangapathirao Venkata Mynam, Bogdan Z. Kasztenny
  • Patent number: 11237201
    Abstract: A partial discharge detecting system includes a partial discharge detecting device to generate a reference frequency signal, to detect a partial discharge pulse signal, and to convert the detected partial discharge pulse signal into a partial discharge digital signal, a main processor to synchronize the partial discharge digital signal, based on a zero-phase point of the reference frequency signal, to extract effective data from the synchronized partial discharge digital signal, and to store the extracted effective data, and an energy harvesting power supply device to supply power to the partial discharge detecting device and the main processor.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: February 1, 2022
    Assignee: LG ELECTRONICS INC.
    Inventors: Junghwan Kim, Taegu Kang, Byunggoo Kong, Taejung Kwon, Seungha Yoon
  • Patent number: 11218189
    Abstract: A method and an apparatus providing common path distortion (CPD) detection from a field instrument, particularly when the source of the common path distortion is at a portion of the network beyond the subscriber's tap.
    Type: Grant
    Filed: October 9, 2020
    Date of Patent: January 4, 2022
    Assignee: VIAVI SOLUTIONS INC.
    Inventors: Loren R. Eggert, Daniel K. Chappell
  • Patent number: 11211800
    Abstract: A method and system is disclosed for identifying a location of an event in a power distribution network. The method includes receiving voltage and current flowing downstream and upstream of the distribution feeder from at least two distribution-level phasor measurement units (PMUs) installed on a distribution feeder in the power distribution network; calculating changes in forward nodal voltages along the distribution feeder using measurements from at least one PMU of the at least two distribution-level PMUs; calculating changes in backward nodal voltages along the distribution feeder using the measurements from another PMU of the at least two distribution-level PMUs; comparing the calculated changes in the forward nodal voltages to the calculated changes in the backward nodal voltages; and determining the location of the event based on the comparison of the calculated changes of the forward nodal voltages to the calculated changes backward nodal voltages.
    Type: Grant
    Filed: June 7, 2019
    Date of Patent: December 28, 2021
    Assignees: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, LAWRENCE LIVERMORE NATIONAL SECURITY, LLC
    Inventors: Hamed Mohsenian-Rad, Mohammad Farajollahi, Alireza Shahsavari, Emma Mary Stewart
  • Patent number: 11165237
    Abstract: An arc fault detection system samples a high frequency signal on a power line sequentially at different frequency regions according to a frequency hopping sequence, which is repeated a number of times over a predefined period. The different frequency regions include at least one region with a carrier for power line communication on the power line and at least one region without a carrier for power line communication on the power line. The system obtains energy measurements for each frequency region based on the sampled signals, computes an energy level for each frequency region based on the measurements for each region, and assigns a binary value to each region according to the corresponding energy level. The binary value represents a presence or absence of signal content in the frequency region. The system determines a presence or absence of an arc fault based on the binary values for the frequency regions.
    Type: Grant
    Filed: February 12, 2020
    Date of Patent: November 2, 2021
    Assignee: Schneider Electric USA, Inc.
    Inventors: Andi Jakupi, Michel Layour, Hynek Raisigel, Costin Vasile, Paul A. Reid, Gary Scott, Joseph Beierschmitt
  • Patent number: 11146063
    Abstract: The wide application of power electronic components in power systems with renewable energy sources has changed the fault characteristics of conventional power systems, resulting in the performance degradation of conventional protections. To solve these problems, a novel principle of pilot protection based on structural similarity and square error criteria is provided. The structural similarity criterion utilizes the difference of fault characteristics between renewable sources and synchronous generators to identify internal faults, and the square error criterion is used to solve abnormal calculation of the conventional similarity based protection. Compared with conventional differential protections, the disclosed protection shows excellent performance in speed and reliability during various faults.
    Type: Grant
    Filed: March 15, 2021
    Date of Patent: October 12, 2021
    Assignee: North China Electric Power University
    Inventors: Ke Jia, Tianshu Bl, Liming Zheng
  • Patent number: 11119462
    Abstract: A power system energy management system with dynamic state estimation (DSE) is disclosed wherein system dynamic states are estimated using SCADA measurements, PMU measurements, signals of controllers, digital recorders, protection devices, and smart electronic devices. The DSE is solved first by Unscented Kalman Filter, and if the Unscented Kalman Filter is failed, weighted lease square is used to solve the DSE. If weighted lease square is failed, integration method is used to calculate the dynamic states. In another aspect, Unscented Kalman Filter, weighted lease square, and integration calculation are applied to solve the DSE by nodal parallel computing for each generation system.
    Type: Grant
    Filed: October 8, 2019
    Date of Patent: September 14, 2021
    Assignee: Global Energy Interconnection Research Institute (Gelrina)
    Inventors: Renchang Dai, Guangyi Liu, Chen Yuan, Peng Wei, Yongli Zhu, Yi Lu, Zhijun Liao, Zhiwei Wang
  • Patent number: 11073547
    Abstract: The technology described herein is generally directed to a method of locating a fault in a multi-terminal electrical power transmission scheme, such as implemented in a power transmission scheme where each of six terminals is connected with one of four junctions via a power transmission section and each junction interconnects a plurality of power transmission sections. Aspects of the described technology can be directed to measuring the voltage and current at each terminal, calculating from the measured voltage and current at each terminal corresponding voltage and current phasors, determining from the calculated voltage and current phasors a synchronization difference between the measured voltage and current at a designated terminal and the measured voltage and current at each other terminal, modifying the calculated voltage and current phasors to compensate for each synchronization difference, and determining from the compensated voltage and current phasors the location of the fault.
    Type: Grant
    Filed: November 3, 2017
    Date of Patent: July 27, 2021
    Assignee: GENERAL ELECTRIC TECHNOLOGY GMBH
    Inventors: Hengxu Ha, Sankara Subramanian Sri Gopala Krishna Murthi, Gajendiran Balakrishnan
  • Patent number: 11047892
    Abstract: A method and system is provided for locating a fault in a mixed power transmission line. The method is implemented by an Intelligent Electronic Device (IED) of the mixed line. The IED detects a travelling wave from one or more signals received from one or more measurement equipment. Thereafter, the IED identifies a line section with the fault, and generates two or more estimates for the location of the fault based on a time difference between arrival of two peaks of the travelling wave, a velocity of propagation of the travelling wave in the line section identified with the fault, and a length of one or more line sections. The IED determines the location of the fault based on a comparison of each estimate with a threshold, wherein the threshold is estimated based on the one or more signals, equivalent source impedance of each source and total line impedance.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: June 29, 2021
    Assignee: ABB Power Grids Switzerland AG
    Inventors: Naidu Obbalareddi Demudu, Amit Purohit, Sachin Srivastava, Jianping Wang
  • Patent number: 11002780
    Abstract: A distance protection system and method based on a high-frequency fault component is provided for a renewal energy source (RES) system. The voltage drop caused by a fault has a full frequency of components and this can be extracted by a wavelet transform. A frequency selection principle that renders high-frequency impedance models a stable impedance phase angle is determined. On this basis, internal and external faults with respect to a transmission line are determined by comparing the magnitude of a high-frequency operating voltage with the magnitude of a high-frequency voltage at the fault point. This disclosed protection system and method can eliminate the influence of frequency offset and weak feed of the RES system by using high-frequency signals generated by voltage drops at the fault point, and can also tolerate signal noises and fault resistance.
    Type: Grant
    Filed: December 28, 2020
    Date of Patent: May 11, 2021
    Assignee: North China Electric Power University
    Inventors: Ke Jia, Tianshu Bi, Zhe Yang
  • Patent number: 10989752
    Abstract: The present disclosure pertains to systems and methods to detect faults in electric power delivery systems. In one embodiment, a data acquisition system may acquire a plurality of electric power delivery system signals from an electric power transmission line. A traveling wave system may detect a traveling wave based on the plurality of electric power delivery system signals received from the data acquisition system. The traveling wave may be analyzed using a first mode to determine a first mode arrival time and using a second mode to determine a second mode arrival time. A time difference between the first mode arrival time and the second mode arrival time may be determined. A fault location system may estimate or confirm a location of the fault based on the time difference. A protection action module may implement a protective action based on the location of the fault.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: April 27, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Bogdan Z. Kasztenny
  • Patent number: 10985558
    Abstract: The wide application of power electronic components in power systems with renewable energy sources has changed the fault characteristics of conventional power systems, resulting in the performance degradation of conventional protections. To solve these problems, a novel principle of pilot protection based on structural similarity and square error criteria is provided. The structural similarity criterion utilizes the difference of fault characteristics between renewable sources and synchronous generators to identify internal faults, and the square error criterion is used to solve abnormal calculation of the conventional similarity based protection. Compared with conventional differential protections, the disclosed protection shows excellent performance in speed and reliability during various faults.
    Type: Grant
    Filed: August 24, 2020
    Date of Patent: April 20, 2021
    Assignee: North China Electric Power University
    Inventors: Ke Jia, Tianshu Bi, Liming Zheng
  • Patent number: 10921365
    Abstract: A method for testing a printed circuit board is provided. The method includes accessing a list of conductive lands of a printed circuit board to be tested and forming a list of pairs of adjacent conductive lands, based on adjacency assessment in the list of conductive lands. The method includes performing high-potential testing on the printed circuit board, on each of the pairs of adjacent conductive lands.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: February 16, 2021
    Assignee: Arista Networks, Inc.
    Inventor: David A. Cananzi
  • Patent number: 10908202
    Abstract: A distance protection system and method based on a high-frequency fault component is provided for a renewal energy source (RES) system. The voltage drop caused by a fault has a full frequency of components and this can be extracted by a wavelet transform. A frequency selection principle that renders high-frequency impedance models a stable impedance phase angle is determined. On this basis, internal and external faults with respect to a transmission line are determined by comparing the magnitude of a high-frequency operating voltage with the magnitude of a high-frequency voltage at the fault point. This disclosed protection system and method can eliminate the influence of frequency offset and weak feed of the RES system by using high-frequency signals generated by voltage drops at the fault point, and can also tolerate signal noises and fault resistance.
    Type: Grant
    Filed: September 15, 2020
    Date of Patent: February 2, 2021
    Assignee: North China Electric Power University
    Inventors: Ke Jia, Tianshu Bi, Zhe Yang
  • Patent number: 10830807
    Abstract: There is provided a method of locating a fault in a power transmission scheme. The power transmission scheme includes power transmission sections and a first end connection point, a second end connection point, and at least one intermediate connection point. The method includes (i) measuring first and second end voltage phasors at the first and second end connection points respectively; (ii) obtaining a first set of voltage phasors, which includes the measured first end voltage phasor and includes respective voltage phasors at each of the second and intermediate connection points; (iii) obtaining a second set of voltage phasors, which includes the measured second end voltage phasor and includes respective voltage phasors at each of the first and intermediate connection points; (iv) comparing the first and second sets of voltage phasors to identify the power transmission section or connection point corresponding to the location of the fault.
    Type: Grant
    Filed: February 2, 2017
    Date of Patent: November 10, 2020
    Assignee: General Electric Technology GmbH
    Inventors: Hengxu Ha, Sankara Subramanian
  • Patent number: 10690709
    Abstract: A ground electrode (100) positioned in the earth and a monitoring device (200) configured to measure a current and resistance of a ground line, where the monitoring device (200) includes a ground current sensing unit (210) configured to measure the current of the ground line, a resistance sensing unit (220) configured to measure ground resistance of the earth and an earth resistance rate, a voltage sensing unit (230) configured to check a voltage value of commercial power, a temperature and humidity sensing unit (240) configured to check a surrounding temperature and humidity of the monitoring device (200), and a monitoring unit (250) configured to confirm whether the ground current, ground resistance and earth resistance measured are abnormal values by compared with reference values classified based on the temperature and humidity measured.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: June 23, 2020
    Assignee: SUNKWANG LIGHTNING PROTECTION TECHNICAL INSTITUTE INC.
    Inventors: Dong-Jin Kim, Jong-Yeon Kim, Wan-Seong Kwon, Dong-Min Kim, Yong-Su Kim, Byeong-U Kim
  • Patent number: 10666051
    Abstract: Electrical circuit control techniques in power systems are disclosed herein. In one embodiment, a supervisory computer in the power system can be configured to fit phasor measurement data from phasor measurement units into a Gaussian distribution with a corresponding Gaussian confidence level. When the Gaussian confidence level of the fitted Gaussian distribution is above a Gaussian confidence threshold, the supervisory computer can be configured to perform an ambient analysis on the received phasor measurement data to determine an operating characteristic of the power system. The supervisory computer can then automatically applying at least one electrical circuit control action to the power system in response to the determined operating characteristic.
    Type: Grant
    Filed: June 27, 2018
    Date of Patent: May 26, 2020
    Assignee: Washington State University
    Inventors: Vaithianathan Venkatasubramanian, Ebrahim Rezaei
  • Patent number: 10447030
    Abstract: A method is provided for protection in a mixed power transmission line by controlling a switching device connected thereto through an Intelligent Electronic Device (IED). The mixed line has two or more sections with at least one overhead section (10A) and at least one underground section (10B), wherein every two consecutive sections are connected at a junction (10C). The method is implemented by the IED (14), which receives a signal from a measurement equipment. The IED detects a travelling wave from the signal, and determines a first peak of the travelling wave and at least one a peak width, a rise time and a discharge time of the first peak. The IED identifies the section with the fault based on a comparison of at least one of the peak width, the rise time and the discharge time with a corresponding threshold value of each junction, and controls the switching device based on the comparison.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: October 15, 2019
    Assignee: ABB Schweiz AG
    Inventors: Obbalareddi Demudu Naidu, Amit Purohit, Vinay Kariwala, Jianping Wang
  • Patent number: 10445218
    Abstract: Methods and devices for testing graphics hardware may include reading content of a selected capture file from a plurality of capture files. The methods and devices may include transferring content from the selected capture file to an emulator memory of an emulator separate from the computer device. The methods and devices may include executing at least one pseudo central processing unit (pseudo CPU) operation to coordinate the execution of work on a graphics processing unit (GPU) of the emulator using the content from the selected capture file to test the GPU. The methods and devices may include receiving and store rendered image content from the emulator when the work is completed.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: October 15, 2019
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Aaron Rodriguez Hernandez, Jason Gould, Cole Brooking, Nihar Mohapatra, Parikshit Gopal Narkhede, Veena K. Malwankar
  • Patent number: 10436831
    Abstract: A highly accurate fault location method for series-compensated double-circuit transmission lines having series compensation devices and metal oxide varistors (SC&MOV) at first and second terminal ends is provided. Synchronized or unsynchronized current phasors and local voltage phasors are used as input to the fault location method. The voltages and currents at the fault point are formulated as a function of the unknown fault location. Boundary conditions for the particular IED-determined fault type are used to derive the fault location formulas.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: October 8, 2019
    Assignee: ABB Schweiz AG
    Inventors: Ning Kang, Gergely Gombos, Mirrasoul J. Mousavi
  • Patent number: 10291287
    Abstract: A transmission arrangement for an aircraft for transmitting data within the aircraft, wherein the aircraft includes an electrical wiring system of coherent lines for providing electric power for loads in the aircraft, has at least two PLC elements, connectable to a respective one of the lines, for transmitting the data between at least two of the PLC elements via the wiring system, wherein at least one of the PLC elements has at least one filter connection, wherein the filter connection has at least one PLC connection, connectable to a respective one of the lines, and a power connection, connectable to a respective one of the lines, wherein the PLC connection carries power and data and the power connection carries power and is free of data.
    Type: Grant
    Filed: March 30, 2018
    Date of Patent: May 14, 2019
    Assignee: DIEHL AEROSPACE GMBH
    Inventors: Beatrice Kornek-Percin, Goetz Wolk, Sven Gastel, Oliver Pluczinski, Benno Petersen
  • Patent number: 10197614
    Abstract: The present disclosure illustrates the errors that are encountered when using both single-ended and double-ended normal-mode fault location calculations when a fault occurs in a pole-open condition. The disclosure provides systems and methods for accurately calculating the location of faults that occur during pole-open conditions, including single-ended approaches and double-ended approaches.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: February 5, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Gabriel Benmouyal, Brian A. Smyth
  • Patent number: 10161985
    Abstract: A fault location detection method includes detecting an EMI signal and analyzing the spectral content of the electrical signal to identify a fault. A location recorder records the location of the system when the EMI signals are detected and a processor analyses the EMI signals and records the location of the system to determine a location of the fault. A memory includes an aerial photograph of a geographic location within which faults are to be detected and wherein the processor overlays the position of the faults on the aerial photograph. In addition, a transparent intensity map is superimposed onto a satellite photo of a geographic location and this is displayed to a user.
    Type: Grant
    Filed: August 18, 2014
    Date of Patent: December 25, 2018
    Assignee: Eskom Holdings SOC Limited
    Inventor: Simon Higgins
  • Patent number: 10115552
    Abstract: A retrofit CAFI/GFI remote control module may provide dual function protection for simple thermal-magnetic circuit breakers in a residential load center with arc fault and ground fault protection. The module provides line sensors and electronic processing to detect ground faults or arc faults, or both, and operates a bistable relay between the branch breaker and the load to open the circuit, which can then be remotely or manually reset.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: October 30, 2018
    Assignee: Schneider Electric USA, Inc.
    Inventor: Chad R. Mittelstadt
  • Patent number: 9871557
    Abstract: Embodiments provided describe detections of RF leakage test signal emanating from cable plant. In one embodiment a single mobile receive antenna, connected to a complex demodulator mobile receiver, receives a stabilized test signal radiating from the cable plant. The test signal may be a known continuous wave (CW) carrier or other deterministic signal. The received test signal varies in phase as a function of a position of the mobile receive antenna relative to the location of a leakage antenna. The phase variance forms a Doppler shift as the test antenna moves relative to the leakage antenna. The receiver generates multiple in-phase (I) and quadrature (Q) test signal samples over a SPA (synthetic phased array) distance as the test antenna's travels, and the samples are inserted into a Fourier transform. The result of the transform is instantaneous Doppler frequency shift, from which a bearing angle can be computed.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: January 16, 2018
    Assignee: Cable Television Laboratories, Inc.
    Inventor: Thomas H. Williams
  • Patent number: 9863997
    Abstract: Devices, methods, and systems for localizing a fault on a live cable are described herein. One system includes a wire fault localizer configured to receive current information from a location where direct current is applied to a cable comprising a number of loads, receive additional current information from at least two additional locations on the cable, wherein one of the at least two additional locations is on a source side of the cable and one of the at least two additional locations is on a load side of the cable, determine a fault resistance of the cable based on the received current information and received additional current information, and determine a fault distance on the cable based on the fault resistance.
    Type: Grant
    Filed: June 19, 2015
    Date of Patent: January 9, 2018
    Assignee: Honeywell International Inc.
    Inventors: Venkat Poluru, Mahadevanna Basavaraj Shreshthi, Thappeta Peddaiah, Zhenning Liu, Sundeep Vanka
  • Patent number: 9805477
    Abstract: A method for managing the display on a screen of an electronic device of at least one item of information relating to an apparatus. The method includes providing an enriched image of the apparatus, including an image of the apparatus and interest points of the apparatus, choosing at least one interest point from among the plurality of interest points, for obtaining a set of chosen interest points, selecting information to be displayed, providing a set of diagrams of the apparatus available for the apparatus, optimizing, according to a predefined criterion, each diagram of the apparatus available by inserting into the diagram of the apparatus a preview of information to be displayed for obtaining an enriched schematic representation, and classifying the enriched schematic representations according to the predefined criterion.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: October 31, 2017
    Assignee: SCHNEIDER ELECTRIC INDUSTRIES SAS
    Inventors: Denis Morand, Tewfik Meftah
  • Patent number: 9784783
    Abstract: METHOD AND DEVICE TO IDENTIFY, RECORD AND STORE TRAVELING WAVE HEADS IN ELECTRIC POWER SYSTEMS consisting in sending a trigger (5) signal generated from the monitoring of the basic values of voltage and current of the electrical signal (1) of the transmission system in its fundamental frequency of operation (50/60 Hz), where the generated trigger (5) signal is controlled by continuous monitoring of the parameters derived from the basic values of current and voltage and tested against thresholds previously set by a user.
    Type: Grant
    Filed: January 12, 2010
    Date of Patent: October 10, 2017
    Assignee: Reason Tecnologia S.A.
    Inventors: Conrado Werner Seibel, Carlos Alberto Dutra
  • Patent number: 9689909
    Abstract: A sensor detects partial discharges (PDs) in an electrical power system and generates a corresponding analog electrical signal. A data acquisition component receives the signal from the sensor and converts it to digitized zero span data for a series of uniformly spaced frequencies in a frequency spectrum of interest. A digital signal processing component receives the digitized zero span data, analyzes such data, and generates a corresponding phase resolved spectrum signal in three dimensional format including dimensions of amplitude, phase and frequency for each of the uniformly spaced frequencies. A display component receives the analyzed data stream from the processing component and actuates one or more displays from which characteristics of the PD can be identified, such as different types of PDs from different sources, and information on the location of a PD relative to the sensor.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: June 27, 2017
    Assignee: CableWISE Techimp Limited
    Inventor: Jun Guo
  • Patent number: 9622808
    Abstract: The invention relates to a device for contactless communication between a surgical apparatus and at least one surgical instrument. The surgical apparatus comprises a control and evaluation device to which is assigned a writing or reading device which is connected to an antenna for the apparatus. The instrument is assigned at least one writable and readable memory device, embodied as an RFID transponder, which is connected to an antenna for the instrument, so that data can be exchanged between the writing or reading device of the surgical apparatus and the memory device of the instrument by means of wireless communication.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: April 18, 2017
    Assignee: Erbe Elektromedizin GmbH
    Inventors: Juergen Beller, Uwe Schnitzler, Peter Selig
  • Patent number: 9588169
    Abstract: There are disclosed apparatus and methods for testing a live circuit powered from an alternating current (AC) voltage. A zero crossing detector detects zero crossings of the AC voltage. A spread spectrum time domain reflectometer (SSTDR) coupled to the zero crossing detector performs measurements of the live circuit, each measurement synchronized with a zero crossings of the AC voltage. A processor coupled to the SSTDR detects faults in the live circuit based on correlation data provided by the SSTDR.
    Type: Grant
    Filed: November 18, 2016
    Date of Patent: March 7, 2017
    Assignee: LiveWire Innovation, Inc.
    Inventors: Lee Arthur Watkins, Niall Michael McNamara
  • Patent number: 9553215
    Abstract: The invention relates to a method and a device for recognizing faults in a photovoltaic system (1). A first output voltage (U0, UMPP) of the system (1) and/or a first parameter derived from the output voltage (U0, UMPP) is determined at a first point in time in a first operating state of the photovoltaic system (1). At a second point in time in a second operating state comparable to the first operating state, a second output voltage (U0, UMPP) and/or a second parameter of the system (1) derived from the output voltage (U0, UMPP) is determined. Finally, a deviation between the first and the second output voltage (U0, UMPP) and/or between the first and the second parameter is identified and a fault notification is output if the deviation exceeds a predeterminable threshold.
    Type: Grant
    Filed: October 11, 2010
    Date of Patent: January 24, 2017
    Assignee: Fronius International GmbH
    Inventors: Michael Ammer, Thomas Muehlberger, Roland Proetsch, Yvonne Zwirchmayr
  • Patent number: 9482705
    Abstract: The present invention provides methods and apparatus to detect the presence of interferers in a wideband digital VSWR measurement signal. Interferers cause power differences over different intervals of time and frequency, and may be detected by comparing the measured signals in both time and frequency domains with the original signal. Frequency components in the measured signals may be discarded if the interference is deemed too large. The remaining frequency components can then be used to compute the VSWR.
    Type: Grant
    Filed: March 19, 2012
    Date of Patent: November 1, 2016
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Krista Joleen Hind
  • Patent number: 9379771
    Abstract: A system for measuring a length of one or more spans between a first optical transceiver and a second optical transceiver in a fiber-optic network, which can determine, at a processor associated with the first optical transceiver, a round-trip time of an optical signal communicated from the first optical transceiver to the second optical transceiver and back to the first optical transceiver. The system can also determine, at the processor, a half-round-trip time by dividing the round-trip time by two. The system can also determine, at the processor, a distance between the first and the second optical transceivers by multiplying the speed of light by the half-round-trip time.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: June 28, 2016
    Assignee: Cisco Technology, Inc.
    Inventor: Chris Fludger
  • Patent number: 9354048
    Abstract: A method for measuring a substrate in the form of a lithography mask or a mask blank for producing a lithography mask comprises the alignment of a substrate coordinate system (SKS), predetermined by a first marker structure, relative to a position measurement system, a measurement of actual position data (IST) of a second marker structure with predetermined intended position data (POS) in the substrate coordinate system (SKS), and an establishment of a transformation (T) of the substrate coordinate system (SKS) into a transformed substrate coordinate system (tSKS), wherein the transformation (T) is established in such a way that deviations between the actual position data (IST) and the intended position data (POS) of the second marker structure are reduced.
    Type: Grant
    Filed: May 7, 2015
    Date of Patent: May 31, 2016
    Assignee: Carl Zeiss SMS GmbH
    Inventor: Carola Blaesing-Bangert
  • Patent number: 9228962
    Abstract: A cathodoluminescence detection system is provided, including a source of charged particles arranged to illuminate a sample with a charged particle beam, and an optical path having at least two optical components capable of collecting and conveying light radiation coming from the illuminated sample to an analysis device; each optical component of the optical path is selected so that: the maximum output angle of the optical component is less than or equal to 120% of the maximum acceptance angle of the next optical component; and the diameter of the radiation coming from the optical component in the input plane of the next optical component is less than or equal to 120% of the useful input diameter of the next optical component.
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: January 5, 2016
    Assignees: Centre National de la Recherche, Universite Paris Sud 11
    Inventors: Mathieu Kociak, Luiz Fernando Zagonel, Marcel Tence, Stefano Mazzucco
  • Patent number: 9215045
    Abstract: Signals are transmitted from at least one transmitter that is positioned in an electrical network. The signals that have been transmitted are received a single receiver positioned within the electrical network. At the single receiver, the received signals are analyzed and a determination from the analyzing the received signals is made as to whether a fault has occurred in the electrical network and the approximate location of the fault.
    Type: Grant
    Filed: January 23, 2012
    Date of Patent: December 15, 2015
    Assignee: Howard University
    Inventor: Charles J. Kim
  • Patent number: 9182441
    Abstract: A transmission line system, a device for fault protection and computer programs, and a method for locating a fault in a series-compensated two-terminal power transmission line including a compensating bank for providing series-compensation to the transmission line. Different subroutines are utilized for locating faults on line segments from the first terminal to the compensating bank and line segments from the second terminal to the compensating bank. A selection is then made in order to determine a valid result. The subroutines utilize three phase currents synchronized measurements from both terminals and a three phase voltage measurements from one terminal for determining the respective per unit distance to a fault.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: November 10, 2015
    Assignee: ABB Technology AG
    Inventor: Murari Saha
  • Patent number: 9048781
    Abstract: There is provided an abnormality diagnosis device including: a storage storing power generation output data representing a current and a voltage of electrical power generated by each of the subsystems according to sampling time; a correcting unit configured to correct, for each of the subsystems, at least the current out of the current and the voltage in the power generation output data to a current corresponding to a standard insolation condition to generate corrected data including a corrected current and either one of a corrected voltage or the voltage in the power generation output data; a gradient estimating unit configured to produce, for each of the subsystems, an approximation graph of the corrected data and calculate a gradient of the approximation graph; and an abnormality diagnosing unit determining a subsystem for which the gradient satisfies a first threshold to be a subsystem including an abnormal module.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: June 2, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Makoto Sato, Yoshiaki Hasegawa
  • Publication number: 20150142345
    Abstract: A power supply system for use in a communications system comprises a power supply, a cable interface module, and a processor. The power supply is connected to a local supply, a utility supply, and the communications system. The cable interface module detects an FBC signal associated with the communications system. The processor executes a monitoring process in which the processor monitors the FBC signal for characteristics associated with at least one anomaly and generates a trap signal when an anomaly is detected.
    Type: Application
    Filed: October 16, 2014
    Publication date: May 21, 2015
    Inventors: Robert P. Anderson, Pankaj H. Bhatt, John R. Hewitt, Ronald J. Roybal
  • Patent number: 9037424
    Abstract: A system for detecting a short-circuited ultracapacitor cell in a machine is disclosed. The system may have a memory that stores instructions and one or more processors capable of executing the instructions. The one or more processors may be configured to perform cell balancing among ultracapacitor cells arranged within two or more ultracapacitor modules, each ultracapacitor module including at least two ultracapacitor cells connected in series. The one or more processors may be further configured to measure a module voltage generated by each of the plurality of ultracapacitor modules after performing the cell balancing and before applying a load of the machine to the ultracapacitor modules, and determine whether an ultracapacitor cell among the plurality of ultracapacitor cells is short-circuited based on a comparison of the measured module voltages.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: May 19, 2015
    Assignee: Caterpillar Inc.
    Inventors: Igor Dos Santos Ramos, Andrew A. Knitt, Wellington Ying-Wei Kwok, Kaiyu Wang
  • Patent number: 9037425
    Abstract: Disclosed is a method for determining a position of a forced power oscillation disturbance source in a regional interconnected power grid. According to the method, when forced power oscillation occurs in a regional power grid, an algebraic sum of energy flow directional factors in the regions of the regional interconnected power grid is calculated so as to online determine the position of the disturbance source in real-time. Compared with the conventional disturbance source positioning method based on an energy function, the disturbance source positioning method based on calculation of the energy flow directional factors provided by the invention can reduce the impact of a periodic disturbance component and an initial constant on the determination of an aperiodic component of branch potential energy, thus achieving higher accuracy. Moreover, the integration links are reduced and the calculation process is simplified, thus better meeting the requirements for real-time power grid calculation.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: May 19, 2015
    Assignees: STATE GRID CORPORATION OF CHINA, WUHAN CENTRAL CHINA ELECTRIC POWER & GRID TECHNOLOGY COMPANY, LTD.
    Inventors: Dongjun Yang, Jisheng Li, Jianyong Ding, Hanping Xu, Chunjian Luo
  • Patent number: 9026388
    Abstract: It is determined that a drop in the capacity of a sodium-sulfur battery has proceeded to an abnormal level when both the following expression (1) and expression (2) hold. Qe?Qn?K1 . . . (1) where Qe: abnormal block depth of discharge; Qn: normal block depth of discharge; and K1: block abnormality determination set point (setting value) and Qe?K2 . . . (2) where K2: depth of discharge abnormality determination set point (setting value).
    Type: Grant
    Filed: August 2, 2011
    Date of Patent: May 5, 2015
    Assignee: NGK Insulators, Ltd.
    Inventors: Naoki Hirai, Motohiro Fukuhara
  • Patent number: 9026400
    Abstract: A method of processing system diagnostic data is provided for identifying likely device fix(s) associated with a diagnostic data, and identifying a repair procedure(s) for correcting the likely fix(s). The process receiving diagnostic data from a system onboard computer at a remote diagnostic database, the database being arranged to map system diagnostic data to possible vehicle fix(s). The possible device fix(s) are prioritized in accordance with ranked matches of the received diagnostic data to combinations of diagnostic data stored in a prior experience database. The prior experience database having an identified fix associated with each stored combination of diagnostic data. The fix associated with the highest ranked combination of diagnostic data is identified as the most likely fix. The most likely fix is mapped to a system repair database, the most likely fix being directly mapped to an associated repair procedure for repairing the most likely fix.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: May 5, 2015
    Assignee: Innova Electonics, Inc.
    Inventors: Ieon C. Chen, Robert Madison, Keith Andreasen
  • Patent number: 9021539
    Abstract: “Cradle-to-grave” treatment of leaks begins with technicians logging leakage signal strengths and GPS latitude and longitude coordinates in technicians' vehicles as the technicians go about their daily assignments. Leakage signal strengths and GPS latitude and longitude coordinates are then uploaded to a leakage server. The server calculates leak latitude and longitude coordinates and signal strengths. The system sends the leakage signal strengths and/or calculated leak latitude and longitude coordinates to technicians' vehicles, for example, as components of, or attachments to, work orders. The latitudes and longitudes are converted by GPS navigators in the technicians' vehicles to turn-by-turn directions to the calculated leak locations. The technicians drive to the leaks, identify and repair them, and close the work orders.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: April 28, 2015
    Assignee: Trilithic, Inc.
    Inventor: Raleigh Benton Stelle, IV
  • Patent number: 9009516
    Abstract: In one example, a method includes determining, based on motion data generated by a motion sensor of a wearable computing device, a plurality of motion vectors, wherein one or more components operatively coupled to the wearable computing device are operating in a first power mode during a first time period; determining, based on the plurality of motion vectors, a plurality of values. In this example, the method also includes, responsive to determining that each of the plurality of values satisfies a corresponding threshold, transitioning, by at least one component of the one or more components, from operating in the first power mode to operating in a second power mode.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: April 14, 2015
    Assignee: Google Inc.
    Inventors: Kevin Gabayan, William Haldean Brown
  • Patent number: 9006003
    Abstract: A method of detecting bitmap failure associated with physical coordinates is provided. In the method, data of wafer mapping inspection are obtained first, and the data include images of defects in each of layers within a wafer and a plurality of physical coordinates of the defects. Thereafter, a bitmap failure detection is performed to obtain digital coordinates of failure bits within the wafer. The digital coordinates are converted into a plurality of physical locations, and the physical locations are overlapped with the physical coordinates so as to rapidly obtain correlations between the failure bits and the defects.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: April 14, 2015
    Assignee: MACRONIX International Co., Ltd.
    Inventors: Tuung Luoh, Chi-Min Chen, Ling-Wuu Yang, Ta-Hone Yang, Kuang-Chao Chen
  • Publication number: 20150100256
    Abstract: A non-transitory computer-readable recording medium has stored therein a program that causes a computer to execute an imbalance determining process. The imbalance determining process includes: analyzing fluctuation situations of voltage values of respective phases in a power distribution line using a three-phase three-wire system; determining whether a location at which degree of divergence in voltage values among the phases exceeds a predetermined criterion is present; and outputting a result of the determining.
    Type: Application
    Filed: September 29, 2014
    Publication date: April 9, 2015
    Inventors: Tetsuya KASHIWAGI, Yuichi MATSUFUJI
  • Publication number: 20150100255
    Abstract: A method for locating faults in a power network includes reading power network information stored in a database in a data reading step. A power network matrix is created based on the power network information in a power network creating step. A fault current vector is created in a fault current vector creating step. In a fault locating step, a backward substitution is carried out on the fault current vector and the power network matrix to obtain a detection zone vector, and the fault can be located. The fault locating speed of the power network is, thus, increased.
    Type: Application
    Filed: October 9, 2013
    Publication date: April 9, 2015
    Applicant: I-SHOU University
    Inventors: JEN-HAO TENG, SHANG-WEN LUAN, CHAO-SHUN CHEN, YI-CHENG LIN, WEI-HAO HUANG