GB230725A - Protective devices for alternating current systems - Google Patents

Protective devices for alternating current systems

Info

Publication number
GB230725A
GB230725A GB2130324A GB2130324A GB230725A GB 230725 A GB230725 A GB 230725A GB 2130324 A GB2130324 A GB 2130324A GB 2130324 A GB2130324 A GB 2130324A GB 230725 A GB230725 A GB 230725A
Authority
GB
United Kingdom
Prior art keywords
capacity
winding
current
fault
condenser
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
GB2130324A
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to GB2130324A priority Critical patent/GB230725A/en
Publication of GB230725A publication Critical patent/GB230725A/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

230,725. British Thomson-Houston Co., Ltd., (General Electric Co.). Sept. 9, 1924. Cut-out arrangements.-In a system of the Merz-Price type for polyphase circuits, in order to avoid operation of the relays by the unbalanced capacity currents fed into a healthy section owing to a fault in another section, a potential transformer 22 having an earthed star connected primary winding 23 energized from the protected circuit supplies a neutralizing current through its series connected secondary winding 24 to the pilot wire system in accordance with the capacity currents fed into the circuit when the system voltage is unbalanced due to a fault on another section. In order to bring the currents into the proper phase relationship a condenser 25 of a capacity approximately equal to that of the power circuit is connected in series with the winding 24. As applied to a protective system of the circulating-current type instead of the opposed-voltage type shown, current transformers with ring cores embracing all the phases may be employed and a resistance is connected across the secondary 24 and condenser 25. Specification 17177/10 is referred to.
GB2130324A 1924-09-09 1924-09-09 Protective devices for alternating current systems Expired GB230725A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2130324A GB230725A (en) 1924-09-09 1924-09-09 Protective devices for alternating current systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2130324A GB230725A (en) 1924-09-09 1924-09-09 Protective devices for alternating current systems

Publications (1)

Publication Number Publication Date
GB230725A true GB230725A (en) 1925-03-19

Family

ID=10160596

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2130324A Expired GB230725A (en) 1924-09-09 1924-09-09 Protective devices for alternating current systems

Country Status (1)

Country Link
GB (1) GB230725A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023105333A1 (en) 2022-03-04 2023-10-19 First Fence Ltd IMPROVED PALISADE FENCE POSTS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023105333A1 (en) 2022-03-04 2023-10-19 First Fence Ltd IMPROVED PALISADE FENCE POSTS

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