GB1465721A - Ground fault detector - Google Patents

Ground fault detector

Info

Publication number
GB1465721A
GB1465721A GB2158974A GB2158974A GB1465721A GB 1465721 A GB1465721 A GB 1465721A GB 2158974 A GB2158974 A GB 2158974A GB 2158974 A GB2158974 A GB 2158974A GB 1465721 A GB1465721 A GB 1465721A
Authority
GB
United Kingdom
Prior art keywords
resistor
transformer
thyristor
capacitor
fed
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
GB2158974A
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of GB1465721A publication Critical patent/GB1465721A/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)
  • Emergency Protection Circuit Devices (AREA)

Abstract

1465721 Protective systems MITSUBISHI DENKI KK 15 May 1974 [19 May 1973] 21589/74 Heading H2K A core balance ground fault protective system has the secondary of the core balance transformer 20 arranged to control a semi-conductor switching device such as a thyristor 32 which when mode conducting effects tripping of a circuit interrupter 18 and the circuit between the transformer secondary and thyristor includes a resistor 52, a capacitor 58 serially connected to the resistor 52 and a constant voltage element such as a Zener diode 54 connected across the resistor 52 and having a resistance much lower than the resistor so that when the transformer 20 has an output less than a first predetermined value current passes through the resistor 52 to gradually increase the potential on the capacitor to a second predetermined value at which the thyristor is made conducting and when the transformer output exceeds said first predetermined value current passes through the diode 54 to substantially increase the potential on the capacitor to the value at which the thyristor is mode conducting. The transformer secondary output is fed to the resistor 52 and diode 54 via an adjusting resistor 22 across a further Zener diode 24 and a series combustion of a temperature compensating resistor 26 and thermistor 28 and the resistor 22 with a capacitor are arranged to absorb the effects of line surges. The tripping of the interrupter 18 is controlled by an electromagnet 34 connected to the thyristor 32 and fed with power from a rectifier bridge 38, 40, 42, 44 connected to a transformer 46 fed from the line conductors 10, 12.
GB2158974A 1973-05-19 1974-05-15 Ground fault detector Expired GB1465721A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5618173A JPS505836A (en) 1973-05-19 1973-05-19

Publications (1)

Publication Number Publication Date
GB1465721A true GB1465721A (en) 1977-03-02

Family

ID=13019923

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2158974A Expired GB1465721A (en) 1973-05-19 1974-05-15 Ground fault detector

Country Status (3)

Country Link
JP (1) JPS505836A (en)
DE (1) DE2424205A1 (en)
GB (1) GB1465721A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51136446U (en) * 1975-04-24 1976-11-04
JPS51150448U (en) * 1975-05-27 1976-12-01
JPS51147735A (en) * 1975-06-13 1976-12-18 Mitsubishi Electric Corp Grounding detecting system
JPS5716678Y2 (en) * 1977-04-14 1982-04-07
JPS54134346A (en) * 1978-04-10 1979-10-18 Kawamura Denki Sangyo Leakage breaker
JPS54179442U (en) * 1978-06-07 1979-12-19
DE3230557A1 (en) 1982-08-17 1984-02-23 Siemens AG, 1000 Berlin und 8000 München Fault current protection switch
IT1153226B (en) * 1982-10-08 1987-01-14 Bassani Spa CIRCUIT FOR THE CONTROL OF DIFFERENTIAL SWITCHES
FR2622368B1 (en) * 1987-10-23 1993-04-30 Serd Soc Et Realisa Disjonct SELECTIVE DIFFERENTIAL SWITCH WITH FAULT CURRENT
CN105024344B (en) * 2015-08-07 2018-08-24 郑心怡 Adjustable earth leakage protective device

Also Published As

Publication number Publication date
DE2424205A1 (en) 1974-11-28
JPS505836A (en) 1975-01-22

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Legal Events

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

Effective date: 19920515