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
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)
  • Emergency Protection Circuit Devices (AREA)
  • Networks Using Active Elements (AREA)

Abstract

1444774 Impedance protective systems INDUSTRIELLE DE CONTROLE ET D'EQUIPEMENT 16 Oct 1973 [17 Oct 1972] 48189/73 Heading H2K An impedance protective system fed from current and voltage transformers T 1 , T 2 of a transmission line includes amplifiers 11, 12, 21, 22, fed with summated and difference voltages from the transformers T 1 , T 2 to provide signals to phase comparators 13, 14, 23, 24. Amplifier 11 produces a negative signal related to the sum of the line voltage U and a constant R times the current I which signal is compared at 13 with a current i produced in a phase shift circuit Cl, R2 connected to the current transformer T1. Amplifier 12 produces a signal related to the difference between U and RI and this signal is compared at 14 with the current i. Amplifier 22 produces a negative signal related to U plus a constant z times line current I and this is compared with a current related to I. in comparator 23 and the latter current is also compared in comparator 24 with a signal from the amplifier 22 related to the difference between U and zI.
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 (en) 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 (en)
DE (1) DE2351872C3 (en)
ES (1) ES419728A1 (en)
FR (1) FR2203080B1 (en)
GB (1) GB1444774A (en)
SE (1) SE406998B (en)

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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH600644A5 (en) * 1975-06-19 1978-06-30 Bbc Brown Boveri & Cie
CH613570A5 (en) * 1976-03-25 1979-09-28 Bbc Brown Boveri & Cie
CH618294A5 (en) * 1977-09-06 1980-07-15 Bbc Brown Boveri & Cie
SE418035B (en) * 1979-08-30 1981-04-27 Asea Ab IMPEDANCING DEVICE IN IMPEDANCE PROTECTION
AT386702B (en) * 1985-03-07 1988-10-10 Elin Union Ag Electronic overcurrent relay with phase-angle-dependent sensitivity switching

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 (en) * 1964-06-19 1973-01-25 Hartmann & Braun Ag MEASUREMENT CIRCUIT FOR ELECTRONIC RELAYS
FR1566498A (en) * 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
DE2351872A1 (en) 1974-04-18
SE406998B (en) 1979-03-05
CH575673A5 (en) 1976-05-14
FR2203080B1 (en) 1977-08-26
DE2351872B2 (en) 1980-06-04
FR2203080A1 (en) 1974-05-10
ES419728A1 (en) 1976-03-01
DE2351872C3 (en) 1981-02-12

Similar Documents

Publication Publication Date Title
ES8303738A1 (en) Power supply apparatus.
GB995380A (en) Improvements in or relating to electrical apparatus
GB1444774A (en) Process and apparatus for impedance protection of an electrical transmission line
SE8502704L (en) DIALOGUE PROCEDURES AND DEVICE FOR IMPLEMENTING THE PROCEDURE
GB1504054A (en) Electrical isolaters
GB1212752A (en) Telephone subset with resistive hybrid network
GB1507434A (en) Suppression of interfering signals in an electric measurand transmitter
ES8303857A1 (en) Arrangement for injecting digital signals into a line system.
DE3363169D1 (en) Potential equalizing apparatus
FR2312145A1 (en) Telephone interface unit for conferences - generates signals representing transmission signals and has differential amplifiers
GB1198637A (en) Continuous Monitoring of Corona on Power Cables.
GB1338637A (en) Capacitor voltage transformer systems
GB1491286A (en) Monitoring radiating cable systems
ES433064A1 (en) Circuit for the compensation of current interference signals
GB1046447A (en) Improvements in or relating to d.c. to a.c. signal converters
GB1090901A (en) Protective relay apparatus
GB1144549A (en) Pulse modulation system
FR2442557A1 (en) Automatic telephone line asymmetrical signal balancing - using synthetic centre tap on power supply and regulation of supply transistors
GB1353282A (en) Circuit for detecting signals transmitted onto a two wire line
JPS51114849A (en) Dc signal amplifier circuit
GB1236473A (en) Improvements in or relating to repeater circuit arrangements and signal transmission cables utilising them
GB1300436A (en) Electronic component tester
GB1023153A (en) Improvements relating to electric-current-responsive apparatus
JPS5443449A (en) Amplifier
GB1246381A (en) Improvements in or relating to telephone instrument circuit arrangements

Legal Events

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