GB250494A - Improvements in or relating to protective arrangements for electric distribution or supply systems - Google Patents

Improvements in or relating to protective arrangements for electric distribution or supply systems

Info

Publication number
GB250494A
GB250494A GB2984425A GB2984425A GB250494A GB 250494 A GB250494 A GB 250494A GB 2984425 A GB2984425 A GB 2984425A GB 2984425 A GB2984425 A GB 2984425A GB 250494 A GB250494 A GB 250494A
Authority
GB
United Kingdom
Prior art keywords
section
switch
leakage
trip
earth
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
GB2984425A
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.)
SWITCHGEAR AND COWANS Ltd
Original Assignee
SWITCHGEAR AND COWANS 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 SWITCHGEAR AND COWANS Ltd filed Critical SWITCHGEAR AND COWANS Ltd
Priority to GB2984425A priority Critical patent/GB250494A/en
Publication of GB250494A publication Critical patent/GB250494A/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
    • H02H3/32—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 corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/34—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 corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
    • H02H3/347—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 corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system using summation current transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

250,494. Switchgear & Cowans, Ltd., and Neep, G. H. Nov. 26, 1925. Cut-out anangements. - In a distribution or supply system protected against overload or leakage or both, manually-operated switches 10 are utilized to connect any section to earth directly or through a resistance 11, thus producing an artificial earth, and so, by means of the leakage protective apparatus or the overload devices, or both, trip-out the circuit-breakers of the section. As shown applied to an AC, three-phase section protected by overload coils 5 which trip the eircuit-breaker and by core-balance leakage transformer 6 having a secondary winding 7 connected to the leakage tripping coil 8, one of the phases is connected, at will, to earth through the resistance 11 by closing the switch 10. This brings into action one or both of the tripping- devices to open the circuit-breaker. An earthing connection such as 9, 10, 11 may be associated with each section and, by arranging the trip coils with graded settings and the resistances 11 graded from section to section, when a switch 10 is closed only that tripping-device adjoining the artificial earth connection and on the side nearer to the source of supply is energized and no others. A master multiple switch at the station may be used instead of the single switches, or one or more limiting resistances variable to the requisite values to give the desired selectivity. The arrangement is applicable to normally insulated systems wherein the protective devices is brought into action by discharge across a sparkgap as in Specification 219,717. In such cases the switch 10 completes a circuit between its supply conductor and the earthed side of the spark-gap.
GB2984425A 1925-11-26 1925-11-26 Improvements in or relating to protective arrangements for electric distribution or supply systems Expired GB250494A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2984425A GB250494A (en) 1925-11-26 1925-11-26 Improvements in or relating to protective arrangements for electric distribution or supply systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2984425A GB250494A (en) 1925-11-26 1925-11-26 Improvements in or relating to protective arrangements for electric distribution or supply systems

Publications (1)

Publication Number Publication Date
GB250494A true GB250494A (en) 1926-04-15

Family

ID=10298117

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2984425A Expired GB250494A (en) 1925-11-26 1925-11-26 Improvements in or relating to protective arrangements for electric distribution or supply systems

Country Status (1)

Country Link
GB (1) GB250494A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4164771A (en) * 1977-12-09 1979-08-14 Westinghouse Electric Corp. Wireless emergency power interrupting system for multibranch circuits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4164771A (en) * 1977-12-09 1979-08-14 Westinghouse Electric Corp. Wireless emergency power interrupting system for multibranch circuits

Similar Documents

Publication Publication Date Title
GB1061064A (en) Electric switch installations
GB250494A (en) Improvements in or relating to protective arrangements for electric distribution or supply systems
US2320123A (en) Protection of alternating current electric systems
US2020972A (en) Protective arrangement for electric systems
US2098035A (en) Protection of electric systems
US1884444A (en) Transmission line protective system
US2258248A (en) Protection of alternating current electric systems
US2255678A (en) Ground and interphase protection system
GB218938A (en) Improvements in and relating to a protective device for an alternating current system
US1988121A (en) Protective means for delta connected transmission lines
US1731372A (en) Ground relay
US1759765A (en) Protective system
US2291350A (en) Protective system for feeder circuits
US1969543A (en) Electrical distribution system
US2310753A (en) Protective system
US1563399A (en) Electrical protective device
US1994427A (en) Transmission line protective system
US1468441A (en) Protective device for electric distribution systems
US1973242A (en) Protection of electric systems
US1896943A (en) Selective circuit protecting device
US2008498A (en) Protective arrangement for electric systems
US1693402A (en) Relay system
US2258251A (en) Protection of alternating current electric systems
USRE19220E (en) blake
GB265952A (en) Improvements in and relating to protective systems for electric distribution systems