GB305708A - Electric protective devices - Google Patents

Electric protective devices

Info

Publication number
GB305708A
GB305708A GB3017427A GB3017427A GB305708A GB 305708 A GB305708 A GB 305708A GB 3017427 A GB3017427 A GB 3017427A GB 3017427 A GB3017427 A GB 3017427A GB 305708 A GB305708 A GB 305708A
Authority
GB
United Kingdom
Prior art keywords
protective devices
electric protective
electric
devices
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
GB3017427A
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.)
HERBERT STANLEY PETCH
British Thomson Houston Co Ltd
Original Assignee
HERBERT STANLEY PETCH
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 HERBERT STANLEY PETCH, British Thomson Houston Co Ltd filed Critical HERBERT STANLEY PETCH
Priority to GB3017427A priority Critical patent/GB305708A/en
Publication of GB305708A publication Critical patent/GB305708A/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)
GB3017427A 1927-11-10 1927-11-10 Electric protective devices Expired GB305708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3017427A GB305708A (en) 1927-11-10 1927-11-10 Electric protective devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3017427A GB305708A (en) 1927-11-10 1927-11-10 Electric protective devices

Publications (1)

Publication Number Publication Date
GB305708A true GB305708A (en) 1929-02-11

Family

ID=10303444

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3017427A Expired GB305708A (en) 1927-11-10 1927-11-10 Electric protective devices

Country Status (1)

Country Link
GB (1) GB305708A (en)

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