GB1444774A - Process and apparatus for impedance protection of an electrical transmission line - Google Patents

Process and apparatus for impedance protection of an electrical transmission line

Info

Publication number
GB1444774A
GB1444774A GB4818973A GB4818973A GB1444774A GB 1444774 A GB1444774 A GB 1444774A GB 4818973 A GB4818973 A GB 4818973A GB 4818973 A GB4818973 A GB 4818973A GB 1444774 A GB1444774 A GB 1444774A
Authority
GB
United Kingdom
Prior art keywords
current
amplifier
compared
signal
produces
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
GB4818973A
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.)
IND DE CONTROLE ET DEQUIPEMENT
Original Assignee
IND DE CONTROLE ET DEQUIPEMENT
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 IND DE CONTROLE ET DEQUIPEMENT filed Critical IND DE CONTROLE ET DEQUIPEMENT
Publication of GB1444774A publication Critical patent/GB1444774A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H02H3/38—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 both voltage and current; responsive to phase angle between voltage and current
    • H02H3/382—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 both voltage and current; responsive to phase angle between voltage and current involving phase comparison between current and voltage or between values derived from current and voltage

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Networks Using Active Elements (AREA)
  • Emergency Protection Circuit Devices (AREA)
GB4818973A 1972-10-17 1973-10-16 Process and apparatus for impedance protection of an electrical transmission line Expired GB1444774A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7236705A FR2203080B1 (enrdf_load_stackoverflow) 1972-10-17 1972-10-17

Publications (1)

Publication Number Publication Date
GB1444774A true GB1444774A (en) 1976-08-04

Family

ID=9105755

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4818973A Expired GB1444774A (en) 1972-10-17 1973-10-16 Process and apparatus for impedance protection of an electrical transmission line

Country Status (6)

Country Link
CH (1) CH575673A5 (enrdf_load_stackoverflow)
DE (1) DE2351872C3 (enrdf_load_stackoverflow)
ES (1) ES419728A1 (enrdf_load_stackoverflow)
FR (1) FR2203080B1 (enrdf_load_stackoverflow)
GB (1) GB1444774A (enrdf_load_stackoverflow)
SE (1) SE406998B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4667186A (en) * 1985-03-13 1987-05-19 Raychem Corporation Phase difference fault detector

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH600644A5 (enrdf_load_stackoverflow) * 1975-06-19 1978-06-30 Bbc Brown Boveri & Cie
CH613570A5 (enrdf_load_stackoverflow) * 1976-03-25 1979-09-28 Bbc Brown Boveri & Cie
CH612046A5 (enrdf_load_stackoverflow) 1977-04-01 1979-06-29 Bbc Brown Boveri & Cie
CH618294A5 (enrdf_load_stackoverflow) * 1977-09-06 1980-07-15 Bbc Brown Boveri & Cie
SE418035B (sv) * 1979-08-30 1981-04-27 Asea Ab Impedansmetande anordning vid impedansskydd
AT386702B (de) * 1985-03-07 1988-10-10 Elin Union Ag Elektronisches ueberstromrelais mit phasenwinkel- abhaengiger empfindlichkeitsumschaltung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1096279A (en) * 1964-04-28 1967-12-20 English Electric Co Ltd Protective relays
DE1302257C2 (de) * 1964-06-19 1973-01-25 Hartmann & Braun Ag Messchaltungsanordnung fuer elektronische relais
FR1566498A (enrdf_load_stackoverflow) * 1968-03-11 1969-05-09

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4667186A (en) * 1985-03-13 1987-05-19 Raychem Corporation Phase difference fault detector

Also Published As

Publication number Publication date
FR2203080A1 (enrdf_load_stackoverflow) 1974-05-10
DE2351872A1 (de) 1974-04-18
SE406998B (sv) 1979-03-05
DE2351872B2 (de) 1980-06-04
DE2351872C3 (de) 1981-02-12
ES419728A1 (es) 1976-03-01
CH575673A5 (enrdf_load_stackoverflow) 1976-05-14
FR2203080B1 (enrdf_load_stackoverflow) 1977-08-26

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Legal Events

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