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GB2004144A - Overcurrent protection - Google Patents

Overcurrent protection

Info

Publication number
GB2004144A
GB2004144A GB7835593A GB7835593A GB2004144A GB 2004144 A GB2004144 A GB 2004144A GB 7835593 A GB7835593 A GB 7835593A GB 7835593 A GB7835593 A GB 7835593A GB 2004144 A GB2004144 A GB 2004144A
Authority
GB
United Kingdom
Prior art keywords
voltage
capacitor
current
image
range
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.)
Granted
Application number
GB7835593A
Other versions
GB2004144B (en
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB7835593A priority Critical patent/GB2004144B/en
Publication of GB2004144A publication Critical patent/GB2004144A/en
Application granted granted Critical
Publication of GB2004144B publication Critical patent/GB2004144B/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
    • H02H3/08—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
    • H02H3/093—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 with timing means

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

An inverse time lag over-current release arrangement for an electrical distribution system, especially one operating at a voltage of 1000v A.C. or 1200v D.C. maximum, incorporates means for deriving a d.c. control voltage proportional to the current I and for applying said voltage to a capacitor charging circuit, means for causing the capacitor to charge only when the current flow exceeds a set value Is, and a level detector arranged to generate a tripping signal when the voltage across the capacitor reaches a selected level, with the time taken for the tripping signal to be generated being given by <IMAGE> where k is a constant within the range 20 to 120 and <IMAGE> lies within the range 1 to 8.
GB7835593A 1977-09-06 1978-09-05 Over-current protection arrangements Expired GB2004144B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7835593A GB2004144B (en) 1977-09-06 1978-09-05 Over-current protection arrangements

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3715377 1977-09-06
GB7835593A GB2004144B (en) 1977-09-06 1978-09-05 Over-current protection arrangements

Publications (2)

Publication Number Publication Date
GB2004144A true GB2004144A (en) 1979-03-21
GB2004144B GB2004144B (en) 1982-08-11

Family

ID=26263356

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7835593A Expired GB2004144B (en) 1977-09-06 1978-09-05 Over-current protection arrangements

Country Status (1)

Country Link
GB (1) GB2004144B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237155A (en) * 1989-10-18 1991-04-24 Plessey Co Plc Electrical monitoring circuit
GB2342518A (en) * 1998-10-06 2000-04-12 John Thomas Hampson Overcurrent protection for distribution networks
WO2010069012A1 (en) * 2008-12-19 2010-06-24 Protectelec Pty Limited A protection system for an it electrical distribution system having a floating reference conductor

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237155A (en) * 1989-10-18 1991-04-24 Plessey Co Plc Electrical monitoring circuit
GB2237155B (en) * 1989-10-18 1993-08-04 Plessey Co Plc Improvements relating to monitoring circuit arrangements
GB2342518A (en) * 1998-10-06 2000-04-12 John Thomas Hampson Overcurrent protection for distribution networks
GB2342518B (en) * 1998-10-06 2000-08-23 John Thomas Hampson Overcurrent protection with a voltage-controlled time-multiplier
WO2010069012A1 (en) * 2008-12-19 2010-06-24 Protectelec Pty Limited A protection system for an it electrical distribution system having a floating reference conductor
WO2010069011A1 (en) * 2008-12-19 2010-06-24 Protectelec Pty Limited A sentinel unit for an it electrical distribution system having a floating reference conductor
US8953288B2 (en) 2008-12-19 2015-02-10 Iep2 Research Pty Limited Sentinel unit for an IT electrical distribution system having a floating reference conductor
US8953295B2 (en) 2008-12-19 2015-02-10 Iep2 Research Pty Limited Protection system for an IT electrical distribution system having a floating reference conductor
AU2009327285B2 (en) * 2008-12-19 2016-05-19 Iep2 Research Pty Limited A protection system for an IT electrical distribution system having a floating reference conductor

Also Published As

Publication number Publication date
GB2004144B (en) 1982-08-11

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee