GB1256046A - Protection relay for three-phase electric motors - Google Patents

Protection relay for three-phase electric motors

Info

Publication number
GB1256046A
GB1256046A GB22100/70A GB2210070A GB1256046A GB 1256046 A GB1256046 A GB 1256046A GB 22100/70 A GB22100/70 A GB 22100/70A GB 2210070 A GB2210070 A GB 2210070A GB 1256046 A GB1256046 A GB 1256046A
Authority
GB
United Kingdom
Prior art keywords
armature
turn
currents
short
windings
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
GB22100/70A
Inventor
Alexandru Nicolau
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.)
MANAGER OF ROMAINIAN INST
Original Assignee
MANAGER OF ROMAINIAN INST
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
Priority to CH645670A priority Critical patent/CH527507A/en
Application filed by MANAGER OF ROMAINIAN INST filed Critical MANAGER OF ROMAINIAN INST
Priority to GB22100/70A priority patent/GB1256046A/en
Priority to FR7018426A priority patent/FR2088122A1/fr
Publication of GB1256046A publication Critical patent/GB1256046A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/12—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to underload or no-load
    • H02H3/13—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to underload or no-load for multiphase applications, e.g. phase interruption

Landscapes

  • Control Of Multiple Motors (AREA)
  • Dc Machiner (AREA)

Abstract

1,256,046. Electromagnetic relays. ROMANIAN MANAGER OF INSTITUTUL DE CERCETARE SI PROIECTARE PENTRU INDUSTRIA ELECTROTEHNICA. 7 May, 1970, No. 22100/70. Heading H1N. [Also in Division H2] A three-phase motor protective relay arrangement comprises three closed ring magnetic cores 1 ... 3 which are normally saturated by the flux produced by windings B 1 . . . B 3 energized by the currents in, or voltages of, the three phases. A short-circuited turn S c links the three-cores and the core 4 of an electromagnetic relay having an armature AM normally attracted by the flux resulting from the third harmonic current in the short-circuited turn S c the armature operating contacts C 1 , C 2 controlling the supply to the motor. Should a supply phase fail, then the currents in the windings still energized are in opposition and current ceases to be induced in the turn S c . The armature AM is released and opens contacts C 1 , C 2 to de-energize the operating coil BR of a main contactor I.
GB22100/70A 1970-04-29 1970-05-07 Protection relay for three-phase electric motors Expired GB1256046A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CH645670A CH527507A (en) 1970-04-29 1970-04-29 Device for protecting a three-phase electric motor against two-phase operation
GB22100/70A GB1256046A (en) 1970-04-29 1970-05-07 Protection relay for three-phase electric motors
FR7018426A FR2088122A1 (en) 1970-04-29 1970-05-21

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH645670A CH527507A (en) 1970-04-29 1970-04-29 Device for protecting a three-phase electric motor against two-phase operation
GB22100/70A GB1256046A (en) 1970-04-29 1970-05-07 Protection relay for three-phase electric motors
FR7018426A FR2088122A1 (en) 1970-04-29 1970-05-21

Publications (1)

Publication Number Publication Date
GB1256046A true GB1256046A (en) 1971-12-08

Family

ID=51831279

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22100/70A Expired GB1256046A (en) 1970-04-29 1970-05-07 Protection relay for three-phase electric motors

Country Status (3)

Country Link
CH (1) CH527507A (en)
FR (1) FR2088122A1 (en)
GB (1) GB1256046A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2565430A1 (en) * 1984-06-04 1985-12-06 Shinko Electric Co Ltd CIRCUIT DETECTING A RELAY FAILURE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2565430A1 (en) * 1984-06-04 1985-12-06 Shinko Electric Co Ltd CIRCUIT DETECTING A RELAY FAILURE

Also Published As

Publication number Publication date
CH527507A (en) 1972-08-31
FR2088122A1 (en) 1972-01-07

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