GB169152A - Improvements relating to electrical protective relay apparatus - Google Patents

Improvements relating to electrical protective relay apparatus

Info

Publication number
GB169152A
GB169152A GB22149/21A GB2214921A GB169152A GB 169152 A GB169152 A GB 169152A GB 22149/21 A GB22149/21 A GB 22149/21A GB 2214921 A GB2214921 A GB 2214921A GB 169152 A GB169152 A GB 169152A
Authority
GB
United Kingdom
Prior art keywords
relay apparatus
improvements relating
protective relay
actuated
ground
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
GB22149/21A
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.)
Metropolitan Vickers Electrical Co Ltd
Original Assignee
Metropolitan Vickers Electrical Co 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 Metropolitan Vickers Electrical Co Ltd filed Critical Metropolitan Vickers Electrical Co Ltd
Publication of GB169152A publication Critical patent/GB169152A/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
    • H02H7/08—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 motors

Landscapes

  • Control Of Electric Motors In General (AREA)

Abstract

169,152. Metropolitan-Vickers Electrical Co., Ltd., (Assignees of Wilson, G. P.). Sept. 17, 1920, [Convention date]. Protective arrangements.-In electrically-driven apparatus, such as rolling-mills, which should complete an operation once begun, in addition to the usual overload relays 12, 13, 14, a relay device 15 is provided which, on the event of a ground in the circuit 8 to the motor 3, operates a time-limit relay 7 so that the circuit-interrupter 4 will be actuated, but only after such a time that the operation in hand is completed. An indicator 23 shows at the mill end when a ground has occurred, while a further indicator 24 is actuated in that case at the generating station &c.
GB22149/21A 1920-09-17 1921-08-20 Improvements relating to electrical protective relay apparatus Expired GB169152A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US169152XA 1920-09-17 1920-09-17

Publications (1)

Publication Number Publication Date
GB169152A true GB169152A (en) 1922-03-30

Family

ID=21779699

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22149/21A Expired GB169152A (en) 1920-09-17 1921-08-20 Improvements relating to electrical protective relay apparatus

Country Status (1)

Country Link
GB (1) GB169152A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5136458A (en) * 1989-08-31 1992-08-04 Square D Company Microcomputer based electronic trip system for circuit breakers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5136458A (en) * 1989-08-31 1992-08-04 Square D Company Microcomputer based electronic trip system for circuit breakers

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