GB174769A - Improvements in and relating to protective devices for electric distribution systems - Google Patents

Improvements in and relating to protective devices for electric distribution systems

Info

Publication number
GB174769A
GB174769A GB3152820A GB3152820A GB174769A GB 174769 A GB174769 A GB 174769A GB 3152820 A GB3152820 A GB 3152820A GB 3152820 A GB3152820 A GB 3152820A GB 174769 A GB174769 A GB 174769A
Authority
GB
United Kingdom
Prior art keywords
faults
relays
relating
distribution systems
protective devices
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
GB3152820A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB3152820A priority Critical patent/GB174769A/en
Publication of GB174769A publication Critical patent/GB174769A/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)
  • Emergency Protection Circuit Devices (AREA)

Abstract

174,769. British Thomson - Houston Co., Ltd., and Pearce, H. Nov. 8, 1920. Protective arrangements. - In a Merz-Price system of protection for apparatus and distribution lines, faults between phases are dealt with by connecting a point in the secondary circuit of one of the phase transformers to a corresponding point in the other through phase relays adapted to open the main switch. In the arrangement shown, the mid points of the middle transformer secondary winding are connected together through the relays 12, and only a single additional pilot wire 11 is necessary for dealing with faults between any two phases. Faults to earth are dealt with in the ordinary way by the relays 6 in the pilot wire connections 5 between the balanced transformers.
GB3152820A 1920-11-08 1920-11-08 Improvements in and relating to protective devices for electric distribution systems Expired GB174769A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3152820A GB174769A (en) 1920-11-08 1920-11-08 Improvements in and relating to protective devices for electric distribution systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3152820A GB174769A (en) 1920-11-08 1920-11-08 Improvements in and relating to protective devices for electric distribution systems

Publications (1)

Publication Number Publication Date
GB174769A true GB174769A (en) 1922-02-08

Family

ID=10324435

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3152820A Expired GB174769A (en) 1920-11-08 1920-11-08 Improvements in and relating to protective devices for electric distribution systems

Country Status (1)

Country Link
GB (1) GB174769A (en)

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