GB1337231A - Earth leakage devices - Google Patents

Earth leakage devices

Info

Publication number
GB1337231A
GB1337231A GB1337231DA GB1337231A GB 1337231 A GB1337231 A GB 1337231A GB 1337231D A GB1337231D A GB 1337231DA GB 1337231 A GB1337231 A GB 1337231A
Authority
GB
United Kingdom
Prior art keywords
voltage
charged
capacitor
storage device
energized
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
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.)
HEINEMANN ELECTRIC SOUTH AFRICA Ltd
Original Assignee
HEINEMANN ELECTRIC SOUTH AFRICA 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 HEINEMANN ELECTRIC SOUTH AFRICA Ltd filed Critical HEINEMANN ELECTRIC SOUTH AFRICA Ltd
Publication of GB1337231A publication Critical patent/GB1337231A/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
    • H02H3/33—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 using summation current transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

1337231 Protective arrangements HEINEMANN ELECTRIC SOUTH AFRICA Ltd 29 March 1972 14634/72 Heading H2K An earth leakage protective arrangement cornprises a core-balance transformer 10, means D1 . . . D3 to rectify the voltage induced in the transformer secondary winding 11, a first storage device, e.g. a capacitor C1, charged to a predetermined voltage by the rectified voltage, a first switching device T1, T2 energized by the first storage device when charged, a second storage device, e.g. a capacitor C2 charged by the rectified voltage to a voltage lower than the predetermined voltage, and a second switching device T3 energized when the first switching device is energized to enable the second storage device to discharge into and operate circuit interrupting means S1 via the device T3. Thus a small capacitor C1 is charged to a higher voltage to trigger the switching circuit T1, T2, and a larger capacitor C2 is charged to a lower voltage to provide power for the operating coil S1 of a circuit-breaker, the arrangement using the power output of the transformer more effectively than one with a single storage capacitor.
GB1337231D 1972-03-29 1972-03-29 Earth leakage devices Expired GB1337231A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1463472 1972-03-29

Publications (1)

Publication Number Publication Date
GB1337231A true GB1337231A (en) 1973-11-14

Family

ID=10044785

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1337231D Expired GB1337231A (en) 1972-03-29 1972-03-29 Earth leakage devices

Country Status (1)

Country Link
GB (1) GB1337231A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees