GB1587447A - Offset keying apparatus for protective relaying - Google Patents

Offset keying apparatus for protective relaying Download PDF

Info

Publication number
GB1587447A
GB1587447A GB34317/77A GB3431777A GB1587447A GB 1587447 A GB1587447 A GB 1587447A GB 34317/77 A GB34317/77 A GB 34317/77A GB 3431777 A GB3431777 A GB 3431777A GB 1587447 A GB1587447 A GB 1587447A
Authority
GB
United Kingdom
Prior art keywords
signal
magnitude
logical
current
limits
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
GB34317/77A
Other languages
English (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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of GB1587447A publication Critical patent/GB1587447A/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
    • H02H3/26—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
    • H02H3/28—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
    • H02H3/30—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel
    • H02H3/302—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel involving phase comparison

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
GB34317/77A 1976-08-20 1977-08-16 Offset keying apparatus for protective relaying Expired GB1587447A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/716,045 US4053940A (en) 1976-08-20 1976-08-20 Modified offset keying apparatus for phase comparison relaying

Publications (1)

Publication Number Publication Date
GB1587447A true GB1587447A (en) 1981-04-01

Family

ID=24876503

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34317/77A Expired GB1587447A (en) 1976-08-20 1977-08-16 Offset keying apparatus for protective relaying

Country Status (11)

Country Link
US (1) US4053940A (enExample)
JP (1) JPS5325847A (enExample)
BR (1) BR7705487A (enExample)
CA (1) CA1085953A (enExample)
DE (1) DE2736953A1 (enExample)
ES (1) ES461776A1 (enExample)
FR (1) FR2362513A1 (enExample)
GB (1) GB1587447A (enExample)
IT (1) IT1088501B (enExample)
MX (1) MX143975A (enExample)
SE (1) SE438580B (enExample)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54137649A (en) * 1978-04-18 1979-10-25 Tokyo Electric Power Co Inc:The Digital protective relay device
JPS5752321A (en) 1980-09-10 1982-03-27 Mitsubishi Electric Corp Phase discriminator
US4935837A (en) * 1989-04-03 1990-06-19 Abb Power T&D Company Inc. Phase comparison relaying system with single channel communications link
US6469882B1 (en) * 2001-10-31 2002-10-22 General Electric Company Current transformer initial condition correction
JP4861542B2 (ja) * 2006-07-13 2012-01-25 大成化工株式会社 キャップ付き容器におけるキャップの閉蓋案内装置。

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5013937A (enExample) * 1973-06-08 1975-02-13
US3986079A (en) * 1975-02-07 1976-10-12 Westinghouse Electric Corporation Offset keying technique for segregated phase comparison relaying

Also Published As

Publication number Publication date
FR2362513A1 (fr) 1978-03-17
IT1088501B (it) 1985-06-10
ES461776A1 (es) 1978-12-01
MX143975A (es) 1981-08-12
DE2736953A1 (de) 1978-02-23
US4053940A (en) 1977-10-11
BR7705487A (pt) 1978-07-04
SE438580B (sv) 1985-04-22
SE7709367L (sv) 1978-02-21
FR2362513B1 (enExample) 1980-05-16
CA1085953A (en) 1980-09-16
JPS5325847A (en) 1978-03-10

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee