GB246893A - Improvements in or relating to protective arrangements for alternating current electric circuits - Google Patents

Improvements in or relating to protective arrangements for alternating current electric circuits

Info

Publication number
GB246893A
GB246893A GB2335724A GB2335724A GB246893A GB 246893 A GB246893 A GB 246893A GB 2335724 A GB2335724 A GB 2335724A GB 2335724 A GB2335724 A GB 2335724A GB 246893 A GB246893 A GB 246893A
Authority
GB
United Kingdom
Prior art keywords
winding
circuit
earthed
armature
circuited
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
GB2335724A
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.)
A Reyrolle and Co Ltd
Original Assignee
A Reyrolle and 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 A Reyrolle and Co Ltd filed Critical A Reyrolle and Co Ltd
Priority to GB2335724A priority Critical patent/GB246893A/en
Publication of GB246893A publication Critical patent/GB246893A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26Emergency 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
    • H02H3/32Emergency 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
    • H02H3/33Emergency 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 using summation current transformers
    • H02H3/338Emergency 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 using summation current transformers also responsive to wiring error, e.g. loss of neutral, break

Landscapes

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

Abstract

246,893. Reyrolle & Co., Ltd., A., Clothier, H. W., and Burgess, W. A. A. Oct. 3, 1924. Electromagnetic switches; automatic circuitbreakers; cut-out arrangements. - Relates to a protective arrangement for use in conjunction with a trailing or like cable between an electromagnetically-operated switch and electrical apparatus (for example a portable coal-cutter used in mines), in order to ensure that, when the earthed pilot circuit is incomplete, the gateend switch automatically opens. An electromagnetic relay or other tripping device has a magnetizing winding and an auxiliary winding normally short-circuited by the sound field wire circuit so as to vary the magnetic or inductive effect of the electromagnet. As shown in Fig. 1, the core A has a magnetizing winding B connected to the supply mains and tending to attract the armature A<1> and close the relay. The core, however, has an additional winding D the ends of which are connected to the normally-earthed pilot wires so that the winding is short-circuited and acts to weaken the flux through the armature with the result that, until the earthed pilot circuit becomes incomplete, the armature is not attracted to close the tripping circuit. In a modification, the additional winding is arranged upon a magnetic shunt path A<2>, Fig. 2. When short-circuited, the current induced in the auxiliary winding weakens the flux in the shunt path and therefore increases that through the armature which is therefore attracted to open the holding circuit. The adaptation to a corebalance leakage system for a three-phase, trailing cable supply is shown in Fig. 3. In the event of earth leakage the current in the secondary E<2> trips the gate-end switch G in the usual way. In order to provide for tripping in the event of discontinuity of the earthed pilot circuit K, the transformer is provided with a magnetizing winding E<1> connected across two of the phases and with an additional winding D<5> connected to the earthed field wires which normally shortcircuit it. The short-circuited winding damps the effect of the primary winding E<1> which is then ineffective to energize the secondary E<2>, adequately to trip the circuit-breaker. If, however, the earth circuit becomes incomplete, the circuit-breaker is tripped. Specification 240,574 is referred to.
GB2335724A 1924-10-03 1924-10-03 Improvements in or relating to protective arrangements for alternating current electric circuits Expired GB246893A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2335724A GB246893A (en) 1924-10-03 1924-10-03 Improvements in or relating to protective arrangements for alternating current electric circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2335724A GB246893A (en) 1924-10-03 1924-10-03 Improvements in or relating to protective arrangements for alternating current electric circuits

Publications (1)

Publication Number Publication Date
GB246893A true GB246893A (en) 1926-02-03

Family

ID=10194345

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2335724A Expired GB246893A (en) 1924-10-03 1924-10-03 Improvements in or relating to protective arrangements for alternating current electric circuits

Country Status (1)

Country Link
GB (1) GB246893A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128047A (en) * 1982-10-05 1984-04-18 Northern Eng Ind Earth leakage monitor and earth proving apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128047A (en) * 1982-10-05 1984-04-18 Northern Eng Ind Earth leakage monitor and earth proving apparatus

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