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GB1440124A - Leakage detection and protection for electrical equipment - Google Patents

Leakage detection and protection for electrical equipment

Info

Publication number
GB1440124A
GB1440124A GB2778473A GB2778473A GB1440124A GB 1440124 A GB1440124 A GB 1440124A GB 2778473 A GB2778473 A GB 2778473A GB 2778473 A GB2778473 A GB 2778473A GB 1440124 A GB1440124 A GB 1440124A
Authority
GB
United Kingdom
Prior art keywords
protection
comparator
june
electrical equipment
leakage detection
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
GB2778473A
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.)
Western Industries Pty Ltd
Original Assignee
Western Industries Pty 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
Priority claimed from ZA724073A external-priority patent/ZA724073B/en
Priority claimed from ZA724072A external-priority patent/ZA724072B/en
Application filed by Western Industries Pty Ltd filed Critical Western Industries Pty Ltd
Publication of GB1440124A publication Critical patent/GB1440124A/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
    • H02H3/16—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 fault current to earth, frame or mass
    • H02H3/17—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 fault current to earth, frame or mass by means of an auxiliary voltage injected into the installation to be protected
    • 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
    • H02H3/16—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 fault current to earth, frame or mass

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

1440124 Protective systems WESTERN INDUSTRIES (PTY) Ltd 11 June 1973 [13 June 1972 (2)] 27784/73 Heading H2K A leakage protection system has means such as alternately closed switches 5, 6 applying an alternating voltage through an impedance 4<SP>1</SP> to a conductive member 35, 36 which is part of the equipment powered by a power supply AA but is not part of the power circuit and not directly earthed. The alternating voltage is measured and applied to a comparator 8 which also receives an alternating reference voltage from a supply 30. The output signal of the comparator 8 is applied to a D.C. voltage level detector 11 which can (Fig. 4, not shown) include alternately switched transistors and which operate a control mechanism capable of shutting off the power supply.
GB2778473A 1972-06-13 1973-06-11 Leakage detection and protection for electrical equipment Expired GB1440124A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA724073A ZA724073B (en) 1972-06-13 1972-06-13 Improvements in earth leakage protection
ZA724072A ZA724072B (en) 1972-06-13 1972-06-13 Improvements in direct current level detectors

Publications (1)

Publication Number Publication Date
GB1440124A true GB1440124A (en) 1976-06-23

Family

ID=27131054

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2778473A Expired GB1440124A (en) 1972-06-13 1973-06-11 Leakage detection and protection for electrical equipment

Country Status (6)

Country Link
AU (1) AU5680073A (en)
CH (1) CH554542A (en)
FR (1) FR2188171A1 (en)
GB (1) GB1440124A (en)
IE (1) IE37776B1 (en)
NL (1) NL7308212A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117949718A (en) * 2024-03-25 2024-04-30 杭州海康威视数字技术股份有限公司 Voltage detection system, method and device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117949718A (en) * 2024-03-25 2024-04-30 杭州海康威视数字技术股份有限公司 Voltage detection system, method and device

Also Published As

Publication number Publication date
IE37776B1 (en) 1977-10-12
NL7308212A (en) 1973-12-17
CH554542A (en) 1974-09-30
AU5680073A (en) 1974-12-12
FR2188171A1 (en) 1974-01-18
IE37776L (en) 1973-12-13

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee