FR2229134A1 - Earth leakage trip - cct. used with toroidal transformer for high sensitivity - Google Patents

Earth leakage trip - cct. used with toroidal transformer for high sensitivity

Info

Publication number
FR2229134A1
FR2229134A1 FR7317832A FR7317832A FR2229134A1 FR 2229134 A1 FR2229134 A1 FR 2229134A1 FR 7317832 A FR7317832 A FR 7317832A FR 7317832 A FR7317832 A FR 7317832A FR 2229134 A1 FR2229134 A1 FR 2229134A1
Authority
FR
France
Prior art keywords
high sensitivity
earth leakage
toroidal transformer
circuit
cct
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
FR7317832A
Other languages
French (fr)
Other versions
FR2229134B3 (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.)
Baco SA Const Electr
Original Assignee
Baco SA Const Electr
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 Baco SA Const Electr filed Critical Baco SA Const Electr
Priority to FR7317832A priority Critical patent/FR2229134A1/en
Publication of FR2229134A1 publication Critical patent/FR2229134A1/en
Application granted granted Critical
Publication of FR2229134B3 publication Critical patent/FR2229134B3/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
    • 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
    • H02H3/337—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 avoiding disconnection due to reactive fault currents

Landscapes

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

Abstract

With increasing need for sensitive earth leakage trips the stability of operation becomes more important when handling fault currents of 20 milli-amps. Current peaks, usually capactive, can trip the breaker even though the current would not last sufficiently long to be a hazard. This circuit prevents this whilst giving high sensitivity. It consists of a toroidal transformer with, in the case of a single phase system, a pair of balancing windings in the line and neutral feeds. Unbalance is detected by a third winding connected to a circuit breaker. A fourth winding which gives the impulse protection is connected to either a pair of back to back diodes or a 0.6v Zener diode. An RC circuit is also connected across the diodes.
FR7317832A 1973-05-11 1973-05-11 Earth leakage trip - cct. used with toroidal transformer for high sensitivity Granted FR2229134A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7317832A FR2229134A1 (en) 1973-05-11 1973-05-11 Earth leakage trip - cct. used with toroidal transformer for high sensitivity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7317832A FR2229134A1 (en) 1973-05-11 1973-05-11 Earth leakage trip - cct. used with toroidal transformer for high sensitivity

Publications (2)

Publication Number Publication Date
FR2229134A1 true FR2229134A1 (en) 1974-12-06
FR2229134B3 FR2229134B3 (en) 1976-05-14

Family

ID=9119456

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7317832A Granted FR2229134A1 (en) 1973-05-11 1973-05-11 Earth leakage trip - cct. used with toroidal transformer for high sensitivity

Country Status (1)

Country Link
FR (1) FR2229134A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2530864A1 (en) * 1982-07-26 1984-01-27 Serd Soc Et Realisa Disjonct Time delayed fault current trip for circuit breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2530864A1 (en) * 1982-07-26 1984-01-27 Serd Soc Et Realisa Disjonct Time delayed fault current trip for circuit breaker

Also Published As

Publication number Publication date
FR2229134B3 (en) 1976-05-14

Similar Documents

Publication Publication Date Title
US3555360A (en) Phase controlled ground fault circuit interrupter
GB1448934A (en) Ground fault interrupter
GB1409287A (en) Ground fault indicator device
GB1532814A (en) Protection device for disconnecting a current supply from a load in response to a ground fault current
US3895263A (en) Grounded neutral detector drive circuit for two pole ground fault interrupter
CA1164081A (en) Ground fault circuit interrupting device with improved thyristor triggering
US3857069A (en) Ground fault circuit interrupter and module therefor
US3614534A (en) Ground-fault-responsive electrical protective systems
GB1478527A (en) Ground fault interrupter with means protecting against a ggrounded neutral condition and with a test circuit for testing performance
US3723814A (en) Phase-sensitive ground fault protective systems
US4091431A (en) Ground leakage relay circuit
GB1199200A (en) A Device for Detecting Faults to Earth in a Three-Phase Network with an Earthed Neutral Conductor
GB1115467A (en) Improvements in or relating to electrical circuit protection devices
FR2229134A1 (en) Earth leakage trip - cct. used with toroidal transformer for high sensitivity
GB1485792A (en) Electric circuit interrupters
US3663865A (en) Differential ground fault protection system
GB1455280A (en) Circuit breaker having a polyphase control circuit
GB1442900A (en) Ground fault interrupter circuit with excited secondary winding on differential transformer
US3662218A (en) Ground fault interruptor circuit
GB1097809A (en) Improved circuit breaker control system
US3657604A (en) Shock protection device circuit
GB1255795A (en) Earth leakage protection devices
GB1254788A (en) Improvements in or relating to devices for indicating the condition of a switch
FR2321208A1 (en) Detection of leakage current to earth - uses differential current transformer whose core is saturated by leakage current
US3159767A (en) Voltage sensing and overvoltage indicating circuit