GB1270129A - Earth fault detection circuitry - Google Patents

Earth fault detection circuitry

Info

Publication number
GB1270129A
GB1270129A GB2029169A GB2029169A GB1270129A GB 1270129 A GB1270129 A GB 1270129A GB 2029169 A GB2029169 A GB 2029169A GB 2029169 A GB2029169 A GB 2029169A GB 1270129 A GB1270129 A GB 1270129A
Authority
GB
United Kingdom
Prior art keywords
relay
rectifier
circuit
supply
current
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
GB2029169A
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 GB1270129A publication Critical patent/GB1270129A/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
    • H02H3/16—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 fault current to earth, frame or mass
    • H02H3/17—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 fault current to earth, frame or mass by means of an auxiliary voltage injected into the installation to be protected
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18—Measuring resistance to earth, i.e. line to ground

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

1,270,129. Protective arrangements. BROWN, BOVERI & CO. Ltd. 21 April, 1969 [22 April, 1968], No. 20291/69. Heading H2K. An arrangement for detecting an earth fault on a D.C. circuit, comprises an auxiliary circuit connected by diodes 8, 9 to the conductors of the D.C. circuit, an A.C. supply 3 connected to a rectifier 6 in the auxiliary circuit so that direct current derived from the supply 3 will flow in the auxiliary circuit when an earth fault occurs on the protected D.C. circuit, and a relay 10 responsive to the current taken from the A.C. supply when the fault occurs, the arrangement being such the relay is not subjected to the entire fault current from the protected D.C. circuit. In the arrangement shown the rectifier 6 is a bridge rectifier and the relay 10 is connected by a further bridge rectifier 11 to a transformer 5 on the A.C. side of the rectifier 6. The relay 10 may have a restraining bias provided by a further rectifier 13 connected to the A.C. supply and it may control a circuit breaker or an alarm or indicator. In an alternative arrangement, Fig. 2 (not shown), the relay 10 has two windings and the bridge rectifier 6 is replaced by a balanced rectifier/resistor bridge, so that current from the D.C. network has no effect on the relay and the current drawn from the A.C. source by the relay may be used to give a measure of the insulation resistance.
GB2029169A 1968-04-22 1969-04-21 Earth fault detection circuitry Expired GB1270129A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH590368A CH482332A (en) 1968-04-22 1968-04-22 Earth fault protection device for a direct current network

Publications (1)

Publication Number Publication Date
GB1270129A true GB1270129A (en) 1972-04-12

Family

ID=4301273

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2029169A Expired GB1270129A (en) 1968-04-22 1969-04-21 Earth fault detection circuitry

Country Status (8)

Country Link
BE (1) BE731830A (en)
CA (1) CA944434A (en)
CH (1) CH482332A (en)
DE (1) DE1918734A1 (en)
FR (1) FR2006691A1 (en)
GB (1) GB1270129A (en)
NL (2) NL6906108A (en)
NO (1) NO129433B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110286334A (en) * 2019-06-25 2019-09-27 哈尔滨锐驰风力发电有限责任公司 A kind of DC power supply analogue ground test device
CN114353607A (en) * 2022-01-19 2022-04-15 北京伊拜科技有限责任公司 Detection control method of wireless detonator priming circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110286334A (en) * 2019-06-25 2019-09-27 哈尔滨锐驰风力发电有限责任公司 A kind of DC power supply analogue ground test device
CN114353607A (en) * 2022-01-19 2022-04-15 北京伊拜科技有限责任公司 Detection control method of wireless detonator priming circuit

Also Published As

Publication number Publication date
NL6906108A (en) 1969-10-24
FR2006691A1 (en) 1970-01-02
NO129433B (en) 1974-04-08
CA944434A (en) 1974-03-26
NL7512127A (en) 1976-03-31
DE1918734A1 (en) 1969-11-06
CH482332A (en) 1969-11-30
BE731830A (en) 1969-10-01

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