GB1280704A - Improvements relating to the protection of three-phase alternators - Google Patents

Improvements relating to the protection of three-phase alternators

Info

Publication number
GB1280704A
GB1280704A GB4338769A GB4338769A GB1280704A GB 1280704 A GB1280704 A GB 1280704A GB 4338769 A GB4338769 A GB 4338769A GB 4338769 A GB4338769 A GB 4338769A GB 1280704 A GB1280704 A GB 1280704A
Authority
GB
United Kingdom
Prior art keywords
relay
signals
alternator
star
transformer
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB4338769A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
Brown Boveri und Cie AG Switzerland
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 BBC Brown Boveri AG Switzerland, Brown Boveri und Cie AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of GB1280704A publication Critical patent/GB1280704A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors

Landscapes

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

Abstract

1280704 Protective arrangements BROWN BOVERI & CO Ltd 2 Sept 1969 [3 Sept 1968] 43387/69 Heading H2K An earth fault protection circuit for a threephase star-connected alternator 1, comprises a three-phase transformer 8 having a starconnected primary 81 and an open-delta secondary winding 83 connected to supply through a filter circuit 10, 12, 17 and a rectifier 14 a first signal dependent on the third harmonic of the alternator output voltage, a single phase transformer 7 having its primary winding connected between the alternator star point and earth and its secondary winding connected to supply through a filter circuit 11, 13, 18 and a rectifier 15 a second signal dependent on the third harmonic voltage at the star point, and a relay 16 responsive to the relative magnitudes of the first and second signals. Normally these signals balance and the relay 16 is not energized, but when an earth fault occurs on a winding of the alternator adjacent the star point the signals are unbalanced and relay 16 is energized and closes its contacts to energize a relay 23, which after a delay causes the opening of a main switch 3 and the closing of a field short-circuiting switch 5. Protection against other earth faults may be effected by a further relay 9 responsive to signals of the fundamental frequency derived from the transformer 7 and a star-connected secondary winding 82 of the transformer 8.
GB4338769A 1968-09-03 1969-09-02 Improvements relating to the protection of three-phase alternators Expired GB1280704A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1319968A CH488305A (en) 1968-09-03 1968-09-03 Earth-fault protection device for three-phase generators using the third harmonics generated in the generator

Publications (1)

Publication Number Publication Date
GB1280704A true GB1280704A (en) 1972-07-05

Family

ID=4390259

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4338769A Expired GB1280704A (en) 1968-09-03 1969-09-02 Improvements relating to the protection of three-phase alternators

Country Status (7)

Country Link
BE (1) BE738294A (en)
CH (1) CH488305A (en)
DE (1) DE1803858A1 (en)
FR (1) FR2017260A1 (en)
GB (1) GB1280704A (en)
NL (1) NL6913295A (en)
SE (1) SE355444B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT401443B (en) * 1993-08-19 1996-09-25 Elin Energieversorgung ARRANGEMENT FOR DETECTING STANDSTAND LOCKS IN THREE-PHASE MACHINES
WO2003044545A1 (en) * 2001-11-19 2003-05-30 Alstom Technology Ltd Method for the detection of an earth connection occurring in the vicinity of a neutral point in an electrical device, device for carrying out and application of said method
CN106291434A (en) * 2016-10-26 2017-01-04 广东电网有限责任公司揭阳供电局 Method and system for monitoring primary grounding state of capacitor voltage transformer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3928551A1 (en) * 1989-08-29 1991-03-07 Siemens Ag Short circuit detecting circuitry for three=phase machine - uses relays with resistors and filters to detect displacement voltages of third harmonic and fundamental frequency
CN113671252B (en) * 2021-07-02 2024-05-17 浙江中广电器集团股份有限公司 Power supply protection device and method for air source heat pump unit and storage medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT401443B (en) * 1993-08-19 1996-09-25 Elin Energieversorgung ARRANGEMENT FOR DETECTING STANDSTAND LOCKS IN THREE-PHASE MACHINES
WO2003044545A1 (en) * 2001-11-19 2003-05-30 Alstom Technology Ltd Method for the detection of an earth connection occurring in the vicinity of a neutral point in an electrical device, device for carrying out and application of said method
CN106291434A (en) * 2016-10-26 2017-01-04 广东电网有限责任公司揭阳供电局 Method and system for monitoring primary grounding state of capacitor voltage transformer
CN106291434B (en) * 2016-10-26 2023-04-18 广东电网有限责任公司揭阳供电局 Method and system for monitoring primary grounding state of capacitive voltage transformer

Also Published As

Publication number Publication date
FR2017260A1 (en) 1970-05-22
SE355444B (en) 1973-04-16
CH488305A (en) 1970-03-31
DE1803858A1 (en) 1970-03-12
BE738294A (en) 1970-02-16
NL6913295A (en) 1970-03-05

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees