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GB1520736A - Electrical protection circuits - Google Patents

Electrical protection circuits

Info

Publication number
GB1520736A
GB1520736A GB2953274A GB2953274A GB1520736A GB 1520736 A GB1520736 A GB 1520736A GB 2953274 A GB2953274 A GB 2953274A GB 2953274 A GB2953274 A GB 2953274A GB 1520736 A GB1520736 A GB 1520736A
Authority
GB
United Kingdom
Prior art keywords
relay
energize
july
lamp
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
GB2953274A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB2953274A priority Critical patent/GB1520736A/en
Publication of GB1520736A publication Critical patent/GB1520736A/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
    • H02H3/44—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 the rate of change of electrical quantities
    • 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
    • H02H3/08—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 excess current
    • H02H3/10—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 excess current additionally responsive to some other abnormal electrical conditions
    • H02H3/105—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 excess current additionally responsive to some other abnormal electrical conditions responsive to excess current and fault current to earth
    • 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
    • H02H3/162—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 for AC systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

1520736 Protective systems H W CHAU 2 July 1975 [3 July 1974] 29532/74 Heading H2K Arrangements are described which both indicate and protect against the occurrence of earth leakages and short circuits. Earth leakage results in a current on line 38 in phase with the secondary voltage of transformer 48. Amplifier 42 can then switch on during a positive half cycle to energize a meter relay 52 and thus, via relay 62, circuit breaker 24 and a latching relay 74 for lamp 78. Short circuit produces a sudden pulse of current through inductor 22 and the resultant induced voltage triggers either a thyristor 96 or another meter relay to energize a lamp relay 108 and the circuit breaker.
GB2953274A 1975-07-02 1975-07-02 Electrical protection circuits Expired GB1520736A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2953274A GB1520736A (en) 1975-07-02 1975-07-02 Electrical protection circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2953274A GB1520736A (en) 1975-07-02 1975-07-02 Electrical protection circuits

Publications (1)

Publication Number Publication Date
GB1520736A true GB1520736A (en) 1978-08-09

Family

ID=10293027

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2953274A Expired GB1520736A (en) 1975-07-02 1975-07-02 Electrical protection circuits

Country Status (1)

Country Link
GB (1) GB1520736A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0404406A3 (en) * 1989-06-21 1991-08-28 Orc Manufacturing Co., Ltd. Light source unit for using exposure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0404406A3 (en) * 1989-06-21 1991-08-28 Orc Manufacturing Co., Ltd. Light source unit for using exposure

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee