GB274070A - Improvements in and relating to protective apparatus for electric circuits - Google Patents

Improvements in and relating to protective apparatus for electric circuits

Info

Publication number
GB274070A
GB274070A GB17286/27A GB1728627A GB274070A GB 274070 A GB274070 A GB 274070A GB 17286/27 A GB17286/27 A GB 17286/27A GB 1728627 A GB1728627 A GB 1728627A GB 274070 A GB274070 A GB 274070A
Authority
GB
United Kingdom
Prior art keywords
transformer
relating
electric circuits
protective apparatus
tube
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
GB17286/27A
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
Publication of GB274070A publication Critical patent/GB274070A/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
    • H02H3/302—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 phase comparison

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

274,070. British Thomson-Houston Co., Ltd., (Assignees of Fitzgerald, A. S.). July 9, 1926, [Convention date]. Systems depending on static transformers. - In a protective system a. helium tube 59 is shunted across the primary of a transformer 67 so as to prevent the voltage thereacross, and hence across valves 32, 38 supplied therefrom from exceeding the discharge voltage of the tube. In a modification the filament currents are supplied from a current transformer 24 through an easily saturated transformer so as to limit the maximum voltage applied to the transformer.
GB17286/27A 1926-07-09 1927-06-29 Improvements in and relating to protective apparatus for electric circuits Expired GB274070A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US274070XA 1926-07-09 1926-07-09

Publications (1)

Publication Number Publication Date
GB274070A true GB274070A (en) 1928-01-12

Family

ID=21837555

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17286/27A Expired GB274070A (en) 1926-07-09 1927-06-29 Improvements in and relating to protective apparatus for electric circuits

Country Status (1)

Country Link
GB (1) GB274070A (en)

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