FR2449992A1 - Safety circuit to prevent electrocution - has parallel resistance and few-turns coil in mains earth lead controlling mains switch via close-coupled sensing coil of control circuit - Google Patents

Safety circuit to prevent electrocution - has parallel resistance and few-turns coil in mains earth lead controlling mains switch via close-coupled sensing coil of control circuit

Info

Publication number
FR2449992A1
FR2449992A1 FR7904236A FR7904236A FR2449992A1 FR 2449992 A1 FR2449992 A1 FR 2449992A1 FR 7904236 A FR7904236 A FR 7904236A FR 7904236 A FR7904236 A FR 7904236A FR 2449992 A1 FR2449992 A1 FR 2449992A1
Authority
FR
France
Prior art keywords
coil
mains
switch
few
circuit
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
FR7904236A
Other languages
French (fr)
Other versions
FR2449992B1 (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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7904236A priority Critical patent/FR2449992A1/en
Publication of FR2449992A1 publication Critical patent/FR2449992A1/en
Application granted granted Critical
Publication of FR2449992B1 publication Critical patent/FR2449992B1/fr
Granted 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
    • H02H3/14—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 occurrence of voltage on parts normally at earth potential

Abstract

The connector is for supplying current to an electrical appts. and has live and neutral terminals connected through an electromagnetically operated switch to the main circuit and an earth terminal connected to the mains earth through a parallel circuit of a 0.05 OMEGA to 5 OMEGA resistor and a coil having few turns. The coil is the primary of a current transformer having a primary-secondary turns ratio of 200:1 whose secondary coil is an input to a symmetrical amplifier. The switch is held closed by its energised operating coil until an operator of the apparatus accidentally touches the line supply. The resulting earth current sensed by the current transformer is amplified, rectified and triggers a thyristor which short circuits the switch coil to open the switch and disconnect the supply before the operator is electrocuted. An electrostatic screen coil screens the transformer and the power supply for the amplifier and switch coil is derived from the mains theough a rectifier and smoothing circuit.
FR7904236A 1979-02-20 1979-02-20 Safety circuit to prevent electrocution - has parallel resistance and few-turns coil in mains earth lead controlling mains switch via close-coupled sensing coil of control circuit Granted FR2449992A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7904236A FR2449992A1 (en) 1979-02-20 1979-02-20 Safety circuit to prevent electrocution - has parallel resistance and few-turns coil in mains earth lead controlling mains switch via close-coupled sensing coil of control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7904236A FR2449992A1 (en) 1979-02-20 1979-02-20 Safety circuit to prevent electrocution - has parallel resistance and few-turns coil in mains earth lead controlling mains switch via close-coupled sensing coil of control circuit

Publications (2)

Publication Number Publication Date
FR2449992A1 true FR2449992A1 (en) 1980-09-19
FR2449992B1 FR2449992B1 (en) 1982-08-13

Family

ID=9222176

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7904236A Granted FR2449992A1 (en) 1979-02-20 1979-02-20 Safety circuit to prevent electrocution - has parallel resistance and few-turns coil in mains earth lead controlling mains switch via close-coupled sensing coil of control circuit

Country Status (1)

Country Link
FR (1) FR2449992A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996026567A1 (en) * 1994-02-23 1996-08-29 Gek Chua Chua An earth leakage detector circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104505667A (en) * 2014-12-26 2015-04-08 佛山市顺德区信辉达电子有限公司 Voltage conversion type leakage protection plug

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972742C (en) * 1953-06-13 1959-10-08 Schutzapp Ges Paris & Co M B H Electrical circuit breaker with protective resistor connected in parallel to the trip coil
FR1366183A (en) * 1963-05-30 1964-07-10 Teco Device for protection against energization, by accidental contact with an electric current conductor, of a mass connected to the earth
FR1494065A (en) * 1965-05-10 1967-09-08 Const De Vaux Andigny Atel Detector-amplifier for low level signals and devices with application
DE1588949A1 (en) * 1967-07-31 1971-04-08 Leopold Rolf Dipl Ing Electronic, voltage-dependent tripping device for actuating switches
US3619723A (en) * 1970-09-30 1971-11-09 Gen Electric Sensitive peak current detector for ground fault protection circuits
FR2299750A1 (en) * 1975-01-31 1976-08-27 Vitte Jacky SAFETY DEVICE FOR THE

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972742C (en) * 1953-06-13 1959-10-08 Schutzapp Ges Paris & Co M B H Electrical circuit breaker with protective resistor connected in parallel to the trip coil
FR1366183A (en) * 1963-05-30 1964-07-10 Teco Device for protection against energization, by accidental contact with an electric current conductor, of a mass connected to the earth
FR1494065A (en) * 1965-05-10 1967-09-08 Const De Vaux Andigny Atel Detector-amplifier for low level signals and devices with application
DE1588949A1 (en) * 1967-07-31 1971-04-08 Leopold Rolf Dipl Ing Electronic, voltage-dependent tripping device for actuating switches
US3619723A (en) * 1970-09-30 1971-11-09 Gen Electric Sensitive peak current detector for ground fault protection circuits
FR2299750A1 (en) * 1975-01-31 1976-08-27 Vitte Jacky SAFETY DEVICE FOR THE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXRV/63 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996026567A1 (en) * 1994-02-23 1996-08-29 Gek Chua Chua An earth leakage detector circuit

Also Published As

Publication number Publication date
FR2449992B1 (en) 1982-08-13

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Legal Events

Date Code Title Description
ST Notification of lapse