CA2066515A1 - Ground fault interruptor circuit with electronic latch - Google Patents

Ground fault interruptor circuit with electronic latch

Info

Publication number
CA2066515A1
CA2066515A1 CA002066515A CA2066515A CA2066515A1 CA 2066515 A1 CA2066515 A1 CA 2066515A1 CA 002066515 A CA002066515 A CA 002066515A CA 2066515 A CA2066515 A CA 2066515A CA 2066515 A1 CA2066515 A1 CA 2066515A1
Authority
CA
Canada
Prior art keywords
circuit
normally open
electronic latch
open switch
fault
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.)
Granted
Application number
CA002066515A
Other languages
French (fr)
Other versions
CA2066515C (en
Inventor
Mark Baer
James M. Robitaille
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.)
Shop Vac Corp
Original Assignee
Shop Vac 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 Shop Vac Corp filed Critical Shop Vac Corp
Publication of CA2066515A1 publication Critical patent/CA2066515A1/en
Application granted granted Critical
Publication of CA2066515C publication Critical patent/CA2066515C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Landscapes

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

Abstract

A ground fault interruptor circuit interrupts the flow of current to a pair of lines extending between a source of power and a load. The ground fault interruptor circuit includes a circuit brewer comprising a normally open switch located in one ar both of the lines, a relay circuit for selectively closing the normally open switch, an electronic latch circuit operable in first and second bi-stable states and a fault sensing circuit for sensing the presence of a fault condition in at least one of the lines. The electronic latch circuit causes the relay circuit to close the normally open switch and maintain the normally open switch in its closed position when the electronic latch circuit is in the first bi-stable state. The electronic latch circuit also causes the relay circuit to permit the normally open switch to return to its normally open condition when the latch circuit is in its second bi-stable state. A fault sensing circuit senses the presence of a fault condition in at least one of the lines and causes the electronic latch circuit to latch in its second state upon detection of the fault condition.
CA002066515A 1991-05-16 1992-04-21 Ground fault interruptor circuit with electronic latch Expired - Lifetime CA2066515C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/701,651 1991-05-16
US07/701,651 US5177657A (en) 1991-05-16 1991-05-16 Ground fault interruptor circuit with electronic latch

Publications (2)

Publication Number Publication Date
CA2066515A1 true CA2066515A1 (en) 1992-11-17
CA2066515C CA2066515C (en) 2001-12-18

Family

ID=24818162

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002066515A Expired - Lifetime CA2066515C (en) 1991-05-16 1992-04-21 Ground fault interruptor circuit with electronic latch

Country Status (2)

Country Link
US (1) US5177657A (en)
CA (1) CA2066515C (en)

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Also Published As

Publication number Publication date
CA2066515C (en) 2001-12-18
US5177657A (en) 1993-01-05

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Legal Events

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