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GB619015A - Improvements in or relating to the protection of direct current electrical feeders - Google Patents

Improvements in or relating to the protection of direct current electrical feeders

Info

Publication number
GB619015A
GB619015A GB3429946A GB3429946A GB619015A GB 619015 A GB619015 A GB 619015A GB 3429946 A GB3429946 A GB 3429946A GB 3429946 A GB3429946 A GB 3429946A GB 619015 A GB619015 A GB 619015A
Authority
GB
United Kingdom
Prior art keywords
points
transformers
bridge
windings
protective
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
GB3429946A
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.)
LONDON PASSENGER TRANSP BOARD
Original Assignee
LONDON PASSENGER TRANSP BOARD
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 LONDON PASSENGER TRANSP BOARD filed Critical LONDON PASSENGER TRANSP BOARD
Priority to GB3429946A priority Critical patent/GB619015A/en
Publication of GB619015A publication Critical patent/GB619015A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/267—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for parallel lines and wires
    • 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

Landscapes

  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

619,015. Protective cut-out systems. LONDON PASSENGER TRANSPORT BOARD, and READMAN, A. Nov. 19, 1946, No. 34299. [Class 38 (v)] A protective system for direct-current feeders utilizes an alternating-current protective circuit. Four iron-cored transformers T1 ... T4 are arranged in pairs with their primary windings forming part of the circuit 10, 11 to be protected and their secondary windings S1 ... S4 connected in bridge formation, the secondary windings S2, S4 being wound in opposite sense to S1, S3. An A.C. voltage is applied across two points 12, 13 of the bridge and a trip relay R is connected across the other two points 14, 15. Under normal conditions, the bridge is balanced as points 14, 15 have the same potential. Should a fault occur, the resulting potential difference at points 14, 15 will cause the operation of the relay R. This protective circuit may be used to protect two parallel D.C. lines of the same polarity (Fig. 2, not shown), or to protect a single D.C. line (Fig. 3, not shown). In the latter case the pairs of transformers are arranged at opposite ends of the line and connected by a 3-core pilot cable. The transformers may have single turn primary windings and additional multi-turn windings for test purposes. The Specification sets out the theory of the operation of the system.
GB3429946A 1946-11-19 1946-11-19 Improvements in or relating to the protection of direct current electrical feeders Expired GB619015A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3429946A GB619015A (en) 1946-11-19 1946-11-19 Improvements in or relating to the protection of direct current electrical feeders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3429946A GB619015A (en) 1946-11-19 1946-11-19 Improvements in or relating to the protection of direct current electrical feeders

Publications (1)

Publication Number Publication Date
GB619015A true GB619015A (en) 1949-03-02

Family

ID=10363890

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3429946A Expired GB619015A (en) 1946-11-19 1946-11-19 Improvements in or relating to the protection of direct current electrical feeders

Country Status (1)

Country Link
GB (1) GB619015A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676284A (en) * 1950-09-13 1954-04-20 Bendix Aviat Corp Fault protective system
US2802969A (en) * 1952-09-04 1957-08-13 Gen Electric Protective system for direct current circuits and machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676284A (en) * 1950-09-13 1954-04-20 Bendix Aviat Corp Fault protective system
US2802969A (en) * 1952-09-04 1957-08-13 Gen Electric Protective system for direct current circuits and machines

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