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GB1058765A - Improvements relating to earth leakage protective systems - Google Patents

Improvements relating to earth leakage protective systems

Info

Publication number
GB1058765A
GB1058765A GB3270963A GB3270963A GB1058765A GB 1058765 A GB1058765 A GB 1058765A GB 3270963 A GB3270963 A GB 3270963A GB 3270963 A GB3270963 A GB 3270963A GB 1058765 A GB1058765 A GB 1058765A
Authority
GB
United Kingdom
Prior art keywords
earth
transistor
impedance
mains frequency
leakage 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
GB3270963A
Inventor
Harold Townley Baldwin
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.)
Baldwin & Francis Ltd
Original Assignee
Baldwin & Francis 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 Baldwin & Francis Ltd filed Critical Baldwin & Francis Ltd
Priority to GB3270963A priority Critical patent/GB1058765A/en
Publication of GB1058765A publication Critical patent/GB1058765A/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
    • H02H3/162—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 for AC systems
    • H02H3/165—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 for AC systems for three-phase systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H02H1/003—Fault detection by injection of an auxiliary voltage

Landscapes

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

Abstract

1,058,765. Protective arrangements. BALDWIN & FRANCIS Ltd. Nov. 2, 1964 [Aug. 19. 1963], No. 32709/63. Heading H2K. An earth leakage protective system comprises an impedance 17, 18 and an A.C. source 20, 15, having a frequency which is relatively high with respect to the mains frequency, connected between earth 19 and an artificial neutral point 11 provided by inductors 12 star-connected to the phase conductors ] 3. The point 11 is also connected to earth 14 through a capacitor 13 so that under normal conditions the H.F. current flows in the circuit 14... 19 and biases a transistor 22 so that it produces a highfrequency output which is amplified at 23. transformed at 24, rectified at 28 and energizes a relay 27 which at contacts 29 completes the energizing circuit of a contactor 4, 5. In the event of an earth fault, current of mains frequency flowing to earth through the impedance 17, 18 causes the transistor 22 to be altemately cut-off and overdriven so suppressing the H.F component from the output of the transistor 22. The transformer 24 presents a lower impedance to the mains frequency current and relay 27 releases causing the contactor to open.
GB3270963A 1963-08-19 1963-08-19 Improvements relating to earth leakage protective systems Expired GB1058765A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3270963A GB1058765A (en) 1963-08-19 1963-08-19 Improvements relating to earth leakage protective systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3270963A GB1058765A (en) 1963-08-19 1963-08-19 Improvements relating to earth leakage protective systems

Publications (1)

Publication Number Publication Date
GB1058765A true GB1058765A (en) 1967-02-15

Family

ID=10342841

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3270963A Expired GB1058765A (en) 1963-08-19 1963-08-19 Improvements relating to earth leakage protective systems

Country Status (1)

Country Link
GB (1) GB1058765A (en)

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