GB774507A - Improvements in or relating to signalling equipment combined with a.c. electric transmission lines - Google Patents

Improvements in or relating to signalling equipment combined with a.c. electric transmission lines

Info

Publication number
GB774507A
GB774507A GB983951A GB983951A GB774507A GB 774507 A GB774507 A GB 774507A GB 983951 A GB983951 A GB 983951A GB 983951 A GB983951 A GB 983951A GB 774507 A GB774507 A GB 774507A
Authority
GB
United Kingdom
Prior art keywords
currents
line
fault
transformers
induced
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
GB983951A
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.)
CENTRAL ELECTRICITY AUTHORITY
Original Assignee
CENTRAL ELECTRICITY AUTHORITY
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 CENTRAL ELECTRICITY AUTHORITY filed Critical CENTRAL ELECTRICITY AUTHORITY
Priority to GB983951A priority Critical patent/GB774507A/en
Publication of GB774507A publication Critical patent/GB774507A/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
    • H02H3/307—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 comparison of quantities derived from a plurality of phases, e.g. homopolar quantities; using mixing transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Locating Faults (AREA)

Abstract

774,507. Locating faults. CENTRAL ELECTRICITY AUTHORITY and CASSON, W. July 28, 1952 [April 26, 1951], No. 9839/51. Class 37. [Also in Group XXXVII] An insulated conductor which is earthed at both ends and may serve as a channel for fault location or for line protection or communication purposes is erected on an overhead power line in proximity to the line wires so that power frequency currents are induced in the conductor. In an application to fault location, the currents in the insulated conductor 4 and in the power line 1 are applied at each end over current transformers 11, 14 to a summation transformer 12. Under healthy or through fault conditions these currents balance out each transformer. If an internal fault occurs, the direction of the line currents at one end will be reversed and two counteracting induced currents will be produced. The magnitude of the resultant induced current is then determined primarily by the position of the fault and since the summation transformers are no longer balanced, this position may be determined from the readings of high-speed maximum deflection ammeters A coupled to the transformers.
GB983951A 1951-04-26 1951-04-26 Improvements in or relating to signalling equipment combined with a.c. electric transmission lines Expired GB774507A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB983951A GB774507A (en) 1951-04-26 1951-04-26 Improvements in or relating to signalling equipment combined with a.c. electric transmission lines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB983951A GB774507A (en) 1951-04-26 1951-04-26 Improvements in or relating to signalling equipment combined with a.c. electric transmission lines

Publications (1)

Publication Number Publication Date
GB774507A true GB774507A (en) 1957-05-08

Family

ID=9879762

Family Applications (1)

Application Number Title Priority Date Filing Date
GB983951A Expired GB774507A (en) 1951-04-26 1951-04-26 Improvements in or relating to signalling equipment combined with a.c. electric transmission lines

Country Status (1)

Country Link
GB (1) GB774507A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113572138A (en) * 2021-07-09 2021-10-29 广东云舜综合能源科技有限公司 Method and device for setting electric knife switch with double confirmation functions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113572138A (en) * 2021-07-09 2021-10-29 广东云舜综合能源科技有限公司 Method and device for setting electric knife switch with double confirmation functions
CN113572138B (en) * 2021-07-09 2024-04-26 广东云舜综合能源科技有限公司 Method and device for setting electric knife switch with double confirmation function

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