GB201460A - Improvements in and relating to protective devices for electric circuits - Google Patents

Improvements in and relating to protective devices for electric circuits

Info

Publication number
GB201460A
GB201460A GB2871422A GB2871422A GB201460A GB 201460 A GB201460 A GB 201460A GB 2871422 A GB2871422 A GB 2871422A GB 2871422 A GB2871422 A GB 2871422A GB 201460 A GB201460 A GB 201460A
Authority
GB
United Kingdom
Prior art keywords
transformers
phases
phase
parent specification
relating
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
GB2871422A
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 GB2871422A priority Critical patent/GB201460A/en
Publication of GB201460A publication Critical patent/GB201460A/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

201,460. British Thomson Houston Co., Ltd., and Fitzgerald, A. S. Jan. 23, 1922. Addition to 188,001. Protective arrangements of the Merz-Price type employing current transformers in e a c h phase, that in the middle phase consisting of two separate parts the secondaries of which have half the output of those of the other two phases, the arrangement providing separate protection against faults between any phase and earth, as described in the parent Specification, employ two transformers in each of the three phases all of the transformers being of equal capacity. In the arrangement shown in Fig. 1, in addition to the two transformers 5<a>, 5<b> in the middle phase, two transformers 4<a>, 4<b>, 6<a>, 6<b> are used in the outer phases, the two transformers on the outer phases being connected in parallel and connected to the inner transformers and to the pilot wires as in the parent Specification. The same single unit system of transformers, as described, is employed for the circulating current system of the parent Specification.
GB2871422A 1922-01-23 1922-01-23 Improvements in and relating to protective devices for electric circuits Expired GB201460A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2871422A GB201460A (en) 1922-01-23 1922-01-23 Improvements in and relating to protective devices for electric circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2871422A GB201460A (en) 1922-01-23 1922-01-23 Improvements in and relating to protective devices for electric circuits

Publications (1)

Publication Number Publication Date
GB201460A true GB201460A (en) 1923-07-23

Family

ID=10279908

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2871422A Expired GB201460A (en) 1922-01-23 1922-01-23 Improvements in and relating to protective devices for electric circuits

Country Status (1)

Country Link
GB (1) GB201460A (en)

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