FR2382703A1 - Electrical machine earth fault current detector - uses electroluminescent diode and thyristor controlled capacitor charge discharge circuit - Google Patents

Electrical machine earth fault current detector - uses electroluminescent diode and thyristor controlled capacitor charge discharge circuit

Info

Publication number
FR2382703A1
FR2382703A1 FR7705925A FR7705925A FR2382703A1 FR 2382703 A1 FR2382703 A1 FR 2382703A1 FR 7705925 A FR7705925 A FR 7705925A FR 7705925 A FR7705925 A FR 7705925A FR 2382703 A1 FR2382703 A1 FR 2382703A1
Authority
FR
France
Prior art keywords
earth fault
diode
current
current detector
fault current
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
FR7705925A
Other languages
French (fr)
Other versions
FR2382703B1 (en
Inventor
Charles Benoit
Pierre Favier
Jean-Marie Claudel
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.)
Cegelec SA
Delle Alsthom SA
Original Assignee
Cegelec SA
Delle Alsthom SA
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 Cegelec SA, Delle Alsthom SA filed Critical Cegelec SA
Priority to FR7705925A priority Critical patent/FR2382703A1/en
Publication of FR2382703A1 publication Critical patent/FR2382703A1/en
Application granted granted Critical
Publication of FR2382703B1 publication Critical patent/FR2382703B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/145—Indicating the presence of current or voltage
    • G01R19/15—Indicating the presence of current
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Control Of Eletrric Generators (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The earth fault current detector uses a current transformer whose secondary winding is connected to an electrical circuit. The circuit includes a capacitor (13), which compensates for the current transformers magnetising current, a diode (14) and another capacitor (15). In parallel with the capacitor (15) is connected a first branch of a parallel circuit having a Zener diode (16) in series with a resistance (19). A second branch of the circuit includes an electroluminescent diode (17) and a thyristor (18). The trigger of the thyristor is connected to the common point of the Zener diode (16) and the resistance (19). Under normal conditions there is no current induced in the current transformer and the diode (17) is extinguished. Under fault conditions a voltage is produced at the terminals (12) of the current transformer.
FR7705925A 1977-03-01 1977-03-01 Electrical machine earth fault current detector - uses electroluminescent diode and thyristor controlled capacitor charge discharge circuit Granted FR2382703A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7705925A FR2382703A1 (en) 1977-03-01 1977-03-01 Electrical machine earth fault current detector - uses electroluminescent diode and thyristor controlled capacitor charge discharge circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7705925A FR2382703A1 (en) 1977-03-01 1977-03-01 Electrical machine earth fault current detector - uses electroluminescent diode and thyristor controlled capacitor charge discharge circuit

Publications (2)

Publication Number Publication Date
FR2382703A1 true FR2382703A1 (en) 1978-09-29
FR2382703B1 FR2382703B1 (en) 1980-01-04

Family

ID=9187384

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7705925A Granted FR2382703A1 (en) 1977-03-01 1977-03-01 Electrical machine earth fault current detector - uses electroluminescent diode and thyristor controlled capacitor charge discharge circuit

Country Status (1)

Country Link
FR (1) FR2382703A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0083804A1 (en) * 1982-01-13 1983-07-20 Kabushiki Kaisha Toshiba An AC current detection circuit for a rotor driving supply source of a rotating anode X-ray tube
FR2551217A1 (en) * 1983-08-26 1985-03-01 Bassani Ticcino Spa AC current flow detector
FR2634092A1 (en) * 1988-07-11 1990-01-12 Catu Ets Flash generator, and electrical apparatus, in particular an AC voltage checker, including such a flash generator
EP0386366A2 (en) * 1989-03-09 1990-09-12 General Electric Company Detecting and limiting electrical ground faults within electrical devices
FR2674700A1 (en) * 1991-03-29 1992-10-02 Soule Sa Device for signalling a fault in electrical equipment

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0083804A1 (en) * 1982-01-13 1983-07-20 Kabushiki Kaisha Toshiba An AC current detection circuit for a rotor driving supply source of a rotating anode X-ray tube
FR2551217A1 (en) * 1983-08-26 1985-03-01 Bassani Ticcino Spa AC current flow detector
FR2634092A1 (en) * 1988-07-11 1990-01-12 Catu Ets Flash generator, and electrical apparatus, in particular an AC voltage checker, including such a flash generator
EP0386366A2 (en) * 1989-03-09 1990-09-12 General Electric Company Detecting and limiting electrical ground faults within electrical devices
EP0386366A3 (en) * 1989-03-09 1991-08-07 General Electric Company Detecting and limiting electrical ground faults within electrical devices
FR2674700A1 (en) * 1991-03-29 1992-10-02 Soule Sa Device for signalling a fault in electrical equipment

Also Published As

Publication number Publication date
FR2382703B1 (en) 1980-01-04

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Legal Events

Date Code Title Description
ST Notification of lapse