GB2008345B - Method of and apparatus for monitoring polyphase currents - Google Patents

Method of and apparatus for monitoring polyphase currents

Info

Publication number
GB2008345B
GB2008345B GB7844490A GB7844490A GB2008345B GB 2008345 B GB2008345 B GB 2008345B GB 7844490 A GB7844490 A GB 7844490A GB 7844490 A GB7844490 A GB 7844490A GB 2008345 B GB2008345 B GB 2008345B
Authority
GB
United Kingdom
Prior art keywords
polyphase currents
monitoring
monitoring polyphase
currents
polyphase
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
GB7844490A
Other versions
GB2008345A (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.)
Multilin Inc
Original Assignee
Multilin Inc
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 Multilin Inc filed Critical Multilin Inc
Priority to GB7844490A priority Critical patent/GB2008345B/en
Publication of GB2008345A publication Critical patent/GB2008345A/en
Application granted granted Critical
Publication of GB2008345B publication Critical patent/GB2008345B/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
    • H02H3/083—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 for three-phase systems
    • 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
    • H02H3/165—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 for three-phase systems
    • 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
    • H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/34—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
GB7844490A 1977-11-14 1978-11-14 Method of and apparatus for monitoring polyphase currents Expired GB2008345B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7844490A GB2008345B (en) 1977-11-14 1978-11-14 Method of and apparatus for monitoring polyphase currents

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4736677 1977-11-14
GB7844490A GB2008345B (en) 1977-11-14 1978-11-14 Method of and apparatus for monitoring polyphase currents

Publications (2)

Publication Number Publication Date
GB2008345A GB2008345A (en) 1979-05-31
GB2008345B true GB2008345B (en) 1982-08-18

Family

ID=26266028

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7844490A Expired GB2008345B (en) 1977-11-14 1978-11-14 Method of and apparatus for monitoring polyphase currents

Country Status (1)

Country Link
GB (1) GB2008345B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2929757A1 (en) * 1979-07-23 1981-02-12 Siemens Ag FILTER INPUT PROTECTION
JPS56162921A (en) * 1980-05-20 1981-12-15 Tokyo Shibaura Electric Co Protection relay unit
GB2081994B (en) * 1980-08-11 1983-04-07 South Eastern Elec Board Pulse sampled e l c b
US4381531A (en) * 1981-07-02 1983-04-26 Carrier Corporation Alternating current motor protection system
JPS5858822A (en) * 1981-09-30 1983-04-07 株式会社東芝 Protective relay unit
SE446678B (en) * 1981-11-02 1986-09-29 Asea Ab METHOD TO DETECT EARTH ERRORS IN NET FOR DISTRIBUTION OF ELECTRIC POWER AND DEVICE FOR IMPLEMENTATION OF THE METHOD
EP0092620A1 (en) * 1982-04-28 1983-11-02 Hitachi, Ltd. Protective relay
GB2231216B (en) * 1989-04-05 1993-04-14 Mitsubishi Electric Corp Zero-phase sequence current detector
DE19641183C2 (en) * 1996-09-24 1998-08-20 Siemens Ag Circuit arrangement for current detection of a current conductor for controlling electronically controllable tripping devices
WO2011032585A1 (en) * 2009-09-16 2011-03-24 EMAC (Electromechanical Applications Consulting) Limited Apparatus for protecting a medium voltage distribution transformer and the distribution line upstream of the transformer

Also Published As

Publication number Publication date
GB2008345A (en) 1979-05-31

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Legal Events

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