GB1517352A - Ground fault circuit interrupter - Google Patents

Ground fault circuit interrupter

Info

Publication number
GB1517352A
GB1517352A GB2558275A GB2558275A GB1517352A GB 1517352 A GB1517352 A GB 1517352A GB 2558275 A GB2558275 A GB 2558275A GB 2558275 A GB2558275 A GB 2558275A GB 1517352 A GB1517352 A GB 1517352A
Authority
GB
United Kingdom
Prior art keywords
neutral
amplifier
line
scr
circuit breaker
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
GB2558275A
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.)
Electromagnetic Industries Inc
Original Assignee
Electromagnetic Industries Inc
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 Electromagnetic Industries Inc filed Critical Electromagnetic Industries Inc
Publication of GB1517352A publication Critical patent/GB1517352A/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
    • H02H3/331—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 responsive to earthing of the neutral conductor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/06—Arrangements for supplying operative power

Landscapes

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

Abstract

1517352 Detecting earth faults ELECTROMAGNETIC INDUSTRIES Inc 16 June 1975 [17 June 1974] 25582/75 Heading H2K A neutral-to-earth fault on a line L, N completes a positive feedback path around an amplifier 25 and the oscillations thus produced trip a circuit breaker 5, 6. A first core-balance transformer CT-1, which detects line-to-earth faults as well as constituting part of the feedback path, is connected to the amplifier input, and the amplifier output is connected via a tuning capacitor C-1 to a second core balance transformer CT-2. The neutral is earthed at the source, and thus the presence of a neutral-toearth fault at any other point completes a conductive loop linking both cores, rendering the amplifier unstable. Any output from the amplifier, whether due to line or neutral faults, switches on a transistor Q in alternate half cycles to trigger an SCR via an R-C delay circuit R-5, C-3. The SCR is connected in series with a rectifier BR and the circuit breaker coil 6 between line and neutral conductors, thereby controlling the circuit breaker. The voltage across the SCR when it is not conducting provides a power supply for the circuit.
GB2558275A 1974-06-17 1975-06-16 Ground fault circuit interrupter Expired GB1517352A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US48010474A 1974-06-17 1974-06-17

Publications (1)

Publication Number Publication Date
GB1517352A true GB1517352A (en) 1978-07-12

Family

ID=23906689

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2558275A Expired GB1517352A (en) 1974-06-17 1975-06-16 Ground fault circuit interrupter

Country Status (5)

Country Link
JP (1) JPS5132934A (en)
CA (1) CA1104243A (en)
DE (1) DE2526649B2 (en)
FR (1) FR2275047A1 (en)
GB (1) GB1517352A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1322017A2 (en) * 2001-12-20 2003-06-25 Siemens Aktiengesellschaft Differential current protection

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4929822U (en) * 1972-06-14 1974-03-14
CA1101533A (en) * 1976-04-08 1981-05-19 Raymond H. Legatti Ground fault system with noise immunity
FR2453490A1 (en) * 1979-04-06 1980-10-31 Telemecanique Electrique DEVICE FOR PROTECTING PEOPLE FROM DIRECT CONTACTS WITH ONE OF THE PHASE CONDUCTORS OF AN ELECTRICAL DISTRIBUTION NETWORK AND FOR PROTECTING AGAINST NEUTRAL CONDUCTOR ISOLATION FAULTS
DE3048785A1 (en) * 1980-12-23 1982-07-15 Brown, Boveri & Cie Ag, 6800 Mannheim CIRCUIT ARRANGEMENT FOR DETECTING A FAULT CURRENT
DE3315190A1 (en) * 1983-04-27 1984-10-31 Felten & Guilleaume Energietechnik GmbH, 5000 Köln Triggering system for protection circuit breakers, especially for earth-leakage current protection circuit breakers
GB8404766D0 (en) * 1984-02-23 1984-03-28 Delta Electrical Holdings Earth leakage protective circuit
JPS61117977A (en) * 1984-11-13 1986-06-05 Sanyo Electric Co Ltd Vertical deflecting circuit
DE3836275A1 (en) * 1988-10-25 1990-04-26 Asea Brown Boveri Method for preventing an operating current from flowing through human bodies

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213321A (en) * 1963-05-31 1965-10-19 Charles F Dalziel Miniature differential circuit breaker
US3506906A (en) * 1967-12-18 1970-04-14 Rucker Co Ground fault circuit interrupter with inadvertent ground sensor
US3611035A (en) * 1970-06-08 1971-10-05 Rucker Co Ground fault protective system having grounded neutral protection
US3772569A (en) * 1972-09-05 1973-11-13 Rucker Co Ground fault protective system
US3800189A (en) * 1972-11-28 1974-03-26 Amf Inc Apparatus for detecting a ground connection on load side of neutral conductor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1322017A2 (en) * 2001-12-20 2003-06-25 Siemens Aktiengesellschaft Differential current protection
EP1322017A3 (en) * 2001-12-20 2006-04-12 Siemens Aktiengesellschaft Differential current protection
CN100409521C (en) * 2001-12-20 2008-08-06 西门子公司 Differential current protector

Also Published As

Publication number Publication date
CA1104243A (en) 1981-06-30
JPS5132934A (en) 1976-03-19
JPS5727647B2 (en) 1982-06-11
FR2275047A1 (en) 1976-01-09
DE2526649B2 (en) 1980-05-29
DE2526649A1 (en) 1976-01-02
DE2526649C3 (en) 1987-04-16
FR2275047B1 (en) 1982-03-19

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Legal Events

Date Code Title Description
49R Reference inserted (sect. 9/1949)
PS Patent sealed
SP Amendment (slips) printed
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940616