FR2347807A1 - Protection circuit for equipment with DC supply - acts in case of supply grounding or introduction of HV and uses Wheatstone bridge - Google Patents

Protection circuit for equipment with DC supply - acts in case of supply grounding or introduction of HV and uses Wheatstone bridge

Info

Publication number
FR2347807A1
FR2347807A1 FR7609817A FR7609817A FR2347807A1 FR 2347807 A1 FR2347807 A1 FR 2347807A1 FR 7609817 A FR7609817 A FR 7609817A FR 7609817 A FR7609817 A FR 7609817A FR 2347807 A1 FR2347807 A1 FR 2347807A1
Authority
FR
France
Prior art keywords
supply
introduction
wheatstone bridge
acts
equipment
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
FR7609817A
Other languages
French (fr)
Other versions
FR2347807B1 (en
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.)
FORCLUM FORCE LUMIERE ELECT
Original Assignee
FORCLUM FORCE LUMIERE ELECT
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 FORCLUM FORCE LUMIERE ELECT filed Critical FORCLUM FORCE LUMIERE ELECT
Priority to FR7609817A priority Critical patent/FR2347807A1/en
Publication of FR2347807A1 publication Critical patent/FR2347807A1/en
Application granted granted Critical
Publication of FR2347807B1 publication Critical patent/FR2347807B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18—Measuring resistance to earth, i.e. line to ground
    • 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

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

A circuit is used to provide protection for electronic equipment in general. It is supplied with current from a DC power source. Protection is offered against accidental earthing of one of the DC lines and the system is protected against the introduction of excessively high supply voltages. The circuit is based on the use of a Wheatstone bridge connected to earth via a high resistance element, the bridge circulating current providing warning of supply malfunction. The bridge output is fed to an amplifier such that when an adjustable threshold is exceeded a protection relay is energised. Both a milli ammeter and voltmeter are included in the system to provide visual level monitoring.
FR7609817A 1976-04-05 1976-04-05 Protection circuit for equipment with DC supply - acts in case of supply grounding or introduction of HV and uses Wheatstone bridge Granted FR2347807A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7609817A FR2347807A1 (en) 1976-04-05 1976-04-05 Protection circuit for equipment with DC supply - acts in case of supply grounding or introduction of HV and uses Wheatstone bridge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7609817A FR2347807A1 (en) 1976-04-05 1976-04-05 Protection circuit for equipment with DC supply - acts in case of supply grounding or introduction of HV and uses Wheatstone bridge

Publications (2)

Publication Number Publication Date
FR2347807A1 true FR2347807A1 (en) 1977-11-04
FR2347807B1 FR2347807B1 (en) 1979-10-05

Family

ID=9171386

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7609817A Granted FR2347807A1 (en) 1976-04-05 1976-04-05 Protection circuit for equipment with DC supply - acts in case of supply grounding or introduction of HV and uses Wheatstone bridge

Country Status (1)

Country Link
FR (1) FR2347807A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460558A1 (en) * 1979-06-29 1981-01-23 France Etat Isolated neutral-earth leakage detector - uses bridge configuration and activates alarm once preset level exceeded
WO1994008380A1 (en) * 1992-09-30 1994-04-14 Ab Volvo Sensor for registration of leak current

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460558A1 (en) * 1979-06-29 1981-01-23 France Etat Isolated neutral-earth leakage detector - uses bridge configuration and activates alarm once preset level exceeded
WO1994008380A1 (en) * 1992-09-30 1994-04-14 Ab Volvo Sensor for registration of leak current

Also Published As

Publication number Publication date
FR2347807B1 (en) 1979-10-05

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Legal Events

Date Code Title Description
ST Notification of lapse