[특허]Ground fault location system and ground fault detector therefor

[미국특허] Ground fault location system and ground fault detector therefor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01R-031/14
출원번호	US-0271809 (1999-03-18)
발명자 / 주소	Baldwin Thomas L.
출원인 / 주소	ABB Power T&D Company Inc.
대리인 / 주소	Woodcock Washburn Kurtz Mackiewicz & Norris LLP
인용정보	피인용 횟수 : 12 인용 특허 : 9

초록 ▼

A ground fault location system is used in a multi-phase ungrounded or high-impedance grounded power network. A signal generator is coupled to the network at a first location and generates for each network phase an individual non-DC voltage signal between such phase and ground. A ground fault detector is coupled to the network at a second location and has a summing device and an annunciator. The summing device is coupled to all of the phases of the network at such second location, sums any current passing therethrough, and produces a sum signal. The annunciator receives the sum signal and provides an indication when such signal is non-zero. Each phase of the network at the second location has a distribution current passing therethrough, the sum thereof normally being substantially zero and resulting in a substantially zero sum signal and the lack of an indication from the annunciator based on such distribution currents. When the second location is on a path between the first location and a ground fault, the individual voltage signal on at least one of the phases generates a fault current thereon through such path and results in a non-zero sum signal and an indication from the annunciator. When the second location is not on such path, none of the individual voltage signals generates a fault current on any phase through such path, resulting in a substantially zero sum signal and the lack of an indication from the annunciator.

대표청구항 ▼

[ What is claimed:] [1.] A ground fault detector for a multi-phase ungrounded or high impedance grounded electrical power distribution network, wherein a signal generator is coupled to the network at a first particular network location, the generator generating for each phase of the network an individual non-DC ground fault detection voltage signal between such phase and ground, the ground fault detector for being coupled to the network at a second particular network location separate from the first location and comprising:a summing device for being coupled to all of the phases of the network at such second location, the summing device summing any current at such second location and producing at an output thereof a sum signal representative of such summed current; andan annunciator coupled to the output of the summing device for receiving the sum signal, the annunciator for providing an indication when the sum signal is non-zero;wherein when the detector is coupled to the network and the second location is on a path between the first location and a ground fault, the individual voltage signal on at least one of the phases generates a fault current on such phase through such path, the generated fault current resulting in a non-zero sum signal and the annunciator providing the indication.

이 특허에 인용된 특허 (9) 인용/피인용 타임라인 분석

Wallis Lee D. (Murfreesboro TN) Kennedy Robert A. (Murfreesboro TN), Apparatus and method for detecting a fault in a distributed line network.
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Wallis Lee D. (both Murfreesboro TN) Kennedy Robert A. (both Murfreesboro TN), Apparatus and method for detecting a fault in a distributed line network.
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Kang, Chang E.; Lowry, L. Alan; Burkum, Merlin E., Apparatus and method for locating ground faults.
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Potash Jerome (Flemington NJ), Ground fault detector.
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Jeerings Donald I. (2715 Cypress Dr. Clearwater FL 33575) Linders John R. (5747 Isanda Place Sarasota FL 33581), High impedance fault analyzer in electric power distribution.
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Bergman Sten (Vsters SEX) Ljung Stefan (Vsters SEX), High resistance ground fault protection.
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Janning Eugene A. (West Chester OH), Method of and apparatus for detecting ground faults in isolated power supply systems.
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Baumgartl Ulrich,DEX, Method of determining an earth-fault current.
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Yang Lifeng, One-terminal fault location system that corrects for fault resistance effects.
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이 특허를 인용한 특허 (12) 인용/피인용 타임라인 분석

Thaddeus M. Jones, Capacitance rejecting ground fault protecting apparatus and method.
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Hackl, Dieter; Broeckmann, Eckhard; Macht, Burkhard, Device and method for insulation monitoring in a power supply system including a high-resistance grounded neutral point.
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Wu, Zhilin; Voloh, Ilia; He, Lihan; Xu, Zhihan, Fault location system and method for distribution network.
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Morita,Tsuyoshi; Nakazawa,Shinsuke, Ground fault detector for vehicle.
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Dalban Pilon, Bernard; Gruffaz, Franck, Insulation monitoring system for secured electric power system.
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Pan, Yan; Silveira, Paulo; Steurer, Michael; Baldwin, Thomas; Ribeiro, Paulo, Method for locating phase to ground faults in DC distribution systems.
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Premerlani,William James; Zhou,Rui; Liu,Yan; Papallo, Jr.,Thomas Federick; Lavoie,Gregory Paul; Valdes,Marcelo Esteban; Pintar,Michael Gerard, System and method of locating ground fault in electrical power distribution system.
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Bell, David Gordon, Systems and methods for system measurements integrity determination.
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Estrela, Peter; Wilbur, Jr., Edward W., Unbalanced three phase delta power measurement apparatus and method.
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Neddermeyer, III, Robert N.; Truckenbrod, Gregory R.; Nelson, Matthew S.; Muralidhar, Ashok; Henze, Christopher P., Vehicle or environment-controlled unit having a multiphase alternator with a protected high-voltage bus.
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Neddermeyer, III, Robert N.; Truckenbrod, Gregory R.; Nelson, Matthew S.; Muralidhar, Ashok; Henze, Christopher P., Vehicle or environment-controlled unit having a multiphase alternator with a protected high-voltage bus.
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Neddermeyer, III, Robert N.; Truckenbrod, Gregory R.; Nelson, Matthew S.; Muralidhar, Ashok; Henze, Christopher P., Vehicle or environment-controlled unit having a multiphase alternator with a protected high-voltage bus.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Ground fault location system and ground fault detector therefor 원문보기