SE0203174D0 - Earth fault protection for synchronous machines - Google Patents

Earth fault protection for synchronous machines

Info

Publication number
SE0203174D0
SE0203174D0 SE0203174A SE0203174A SE0203174D0 SE 0203174 D0 SE0203174 D0 SE 0203174D0 SE 0203174 A SE0203174 A SE 0203174A SE 0203174 A SE0203174 A SE 0203174A SE 0203174 D0 SE0203174 D0 SE 0203174D0
Authority
SE
Sweden
Prior art keywords
order harmonic
neutral point
criteria
earth fault
harmonic currents
Prior art date
Application number
SE0203174A
Other languages
Swedish (sv)
Inventor
Sture Lindahl
Original Assignee
Alstom Switzerland Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alstom Switzerland Ltd filed Critical Alstom Switzerland Ltd
Priority to SE0203174A priority Critical patent/SE0203174D0/en
Publication of SE0203174D0 publication Critical patent/SE0203174D0/en
Priority to PCT/EP2003/050709 priority patent/WO2004040732A1/en
Priority to AU2003286190A priority patent/AU2003286190A1/en

Links

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Generators And Motors (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

For a synchronous electric generator an earth fault detection or protection circuit is provided using extracted (35A, 35B, 35C) third order harmonic currents (Ia3, Ib3, Ic3) in the phase windings (1A, 1B, 1C) at locations at the neutral point (N, 5). From the third order harmonic currents, directional criteria (Da, Db, Dc) for each phase winding are calculated (35) indicating the relative magnitude of the third order harmonic current reduced by the other third order harmonic currents. The directional criteria are compared (37) to a normal value valid and it is signalled, when at least one of the directional criteria deviate too much from the normal value, to a control device (39) for disconnecting or disabling the phase windings. Two other criteria, a fault detection criterion (FC) and a range control criterion (RC) are also calculated (41; 49) that can prevent the control device from issuing any signal. The earth fault protection circuit can detect earth faults occurring close the neutral point and can be used in all synchronous machines, which have a neutral point that is isolated or earthed through a large impedance, and which are connected directly to either a non-effectively earthed power network or an effectively earthed power network, for instance high voltage generators of the type Powerformer<TM>.
SE0203174A 2002-10-29 2002-10-29 Earth fault protection for synchronous machines SE0203174D0 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE0203174A SE0203174D0 (en) 2002-10-29 2002-10-29 Earth fault protection for synchronous machines
PCT/EP2003/050709 WO2004040732A1 (en) 2002-10-29 2003-10-13 Earth fault protection for synchronous machines
AU2003286190A AU2003286190A1 (en) 2002-10-29 2003-10-13 Earth fault protection for synchronous machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0203174A SE0203174D0 (en) 2002-10-29 2002-10-29 Earth fault protection for synchronous machines

Publications (1)

Publication Number Publication Date
SE0203174D0 true SE0203174D0 (en) 2002-10-29

Family

ID=20289385

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0203174A SE0203174D0 (en) 2002-10-29 2002-10-29 Earth fault protection for synchronous machines

Country Status (3)

Country Link
AU (1) AU2003286190A1 (en)
SE (1) SE0203174D0 (en)
WO (1) WO2004040732A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114200376A (en) * 2021-11-13 2022-03-18 平顶山姚孟发电有限责任公司 Fault pre-judging system for generator terminal voltage transformer and control method thereof
CN114256827A (en) * 2021-12-17 2022-03-29 华中科技大学 Arc extinction method for network-source direct connection system of marine nuclear power platform

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006004800A1 (en) * 2006-01-23 2007-08-02 Siemens Ag Protective device with a circuit breaker, in particular a low-voltage circuit breaker
AT504920B1 (en) 2007-04-04 2008-09-15 Univ Graz Tech EARTH LOCKING BY FOREIGN CURRENT
JP2012189403A (en) * 2011-03-10 2012-10-04 Hitachi Mitsubishi Hydro Corp Revolving electrical machine
CN103947065A (en) 2011-11-16 2014-07-23 维斯塔斯风力系统集团公司 Protection of a permanent magnet generator
WO2019075673A1 (en) * 2017-10-18 2019-04-25 中国电力科学研究院有限公司 Single-phase-to-ground fault detection method and device based on electric field induction, and storage medium
CN112180290B (en) * 2020-09-29 2024-03-08 西安热工研究院有限公司 Positioning method for generator stator ground fault
CN114578223B (en) * 2020-12-01 2024-10-18 许继电气股份有限公司 Enlarged generator stator grounding protection early warning system and method
CN113203950B (en) * 2021-04-30 2022-02-15 华中科技大学 Method and system for diagnosing ground fault degree of generator stator of marine nuclear power platform
CN117538632B (en) * 2023-08-08 2024-07-26 沈阳工业大学 Grounding fault diagnosis device and method for converter transformer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4297738A (en) * 1979-10-29 1981-10-27 Electric Power Research Institute, Inc. Apparatus for and method of detecting high impedance faults on distribution circuits with delta connected loads
CH663298A5 (en) * 1983-11-30 1987-11-30 Bbc Brown Boveri & Cie DEVICE FOR PROTECTING MULTI-PHASE ELECTRICAL MACHINES.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114200376A (en) * 2021-11-13 2022-03-18 平顶山姚孟发电有限责任公司 Fault pre-judging system for generator terminal voltage transformer and control method thereof
CN114256827A (en) * 2021-12-17 2022-03-29 华中科技大学 Arc extinction method for network-source direct connection system of marine nuclear power platform
CN114256827B (en) * 2021-12-17 2022-09-16 华中科技大学 Arc extinction method for network-source direct connection system of marine nuclear power platform

Also Published As

Publication number Publication date
AU2003286190A1 (en) 2004-05-25
WO2004040732A1 (en) 2004-05-13

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