[go: up one dir, main page]

FR2371805A1 - Electrical appliance earth fault protection circuit - uses two step level relays one controlling alarm and supply interruption - Google Patents

Electrical appliance earth fault protection circuit - uses two step level relays one controlling alarm and supply interruption

Info

Publication number
FR2371805A1
FR2371805A1 FR7634968A FR7634968A FR2371805A1 FR 2371805 A1 FR2371805 A1 FR 2371805A1 FR 7634968 A FR7634968 A FR 7634968A FR 7634968 A FR7634968 A FR 7634968A FR 2371805 A1 FR2371805 A1 FR 2371805A1
Authority
FR
France
Prior art keywords
earth fault
protection circuit
relay
fault protection
signal
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.)
Withdrawn
Application number
FR7634968A
Other languages
French (fr)
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.)
ETRELEC
Original Assignee
ETRELEC
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 ETRELEC filed Critical ETRELEC
Priority to FR7634968A priority Critical patent/FR2371805A1/en
Publication of FR2371805A1 publication Critical patent/FR2371805A1/en
Withdrawn legal-status Critical Current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
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • 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
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H02H3/044—Checking correct functioning of protective arrangements, e.g. by simulating a fault
    • 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

Landscapes

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

Abstract

The earth fault protection circuit uses a transformer core which surrounds the supply cable to the appliance. In the case of an earth fault there is a current imbalance in the cable cores and a signal appears at the output terminals of the transformer (1). This alternating signal has a magnitude which is a function of the current imbalance. The alternating signal is transformed into a continuous signal by a rectifier (2) and is then applied to an OR gate (3). The output of the OR gate being applied to two step relays (4, 5). The signal is applied to one of the relays (4) via an adjustable timer (6). This relay (4) controls an alarm circuit. The operating level of the relay (4) is less than that of the relay (5) which controls interruption of the supply to the appliance. The timer (6) avoids operation of the relay for fleeting faults.
FR7634968A 1976-11-19 1976-11-19 Electrical appliance earth fault protection circuit - uses two step level relays one controlling alarm and supply interruption Withdrawn FR2371805A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7634968A FR2371805A1 (en) 1976-11-19 1976-11-19 Electrical appliance earth fault protection circuit - uses two step level relays one controlling alarm and supply interruption

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7634968A FR2371805A1 (en) 1976-11-19 1976-11-19 Electrical appliance earth fault protection circuit - uses two step level relays one controlling alarm and supply interruption

Publications (1)

Publication Number Publication Date
FR2371805A1 true FR2371805A1 (en) 1978-06-16

Family

ID=9180119

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7634968A Withdrawn FR2371805A1 (en) 1976-11-19 1976-11-19 Electrical appliance earth fault protection circuit - uses two step level relays one controlling alarm and supply interruption

Country Status (1)

Country Link
FR (1) FR2371805A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2604294A1 (en) * 1986-09-23 1988-03-25 Merlin Gerin MULTIPOLAR DIFFERENTIAL CIRCUIT BREAKER WITH MODULAR ASSEMBLY
WO1990007214A1 (en) * 1988-12-16 1990-06-28 Solar Wide Industrial Ltd Method and apparatus for protecting electrical systems
EP0677909A3 (en) * 1994-04-13 1996-06-26 Teuco Guzzini Srl Method and electronic protective device for electrical equipment, in particular for hydromassage baths, saunas, showers and mini-pools.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2047965A1 (en) * 1969-06-26 1971-03-19 Chubu Seiki Kk
US3764853A (en) * 1971-12-27 1973-10-09 R Beachley Means for dual level ground fault protection of a.c. circuits
DE2318072A1 (en) * 1973-04-06 1974-10-24 Licentia Gmbh SYSTEM FOR MONITORING AND ERROR REPORTING IN SECURITY EQUIPMENT

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2047965A1 (en) * 1969-06-26 1971-03-19 Chubu Seiki Kk
US3764853A (en) * 1971-12-27 1973-10-09 R Beachley Means for dual level ground fault protection of a.c. circuits
DE2318072A1 (en) * 1973-04-06 1974-10-24 Licentia Gmbh SYSTEM FOR MONITORING AND ERROR REPORTING IN SECURITY EQUIPMENT

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2604294A1 (en) * 1986-09-23 1988-03-25 Merlin Gerin MULTIPOLAR DIFFERENTIAL CIRCUIT BREAKER WITH MODULAR ASSEMBLY
EP0264314A1 (en) * 1986-09-23 1988-04-20 Merlin Gerin Multipole differential circuit breaker with a modular assembly
WO1990007214A1 (en) * 1988-12-16 1990-06-28 Solar Wide Industrial Ltd Method and apparatus for protecting electrical systems
EP0677909A3 (en) * 1994-04-13 1996-06-26 Teuco Guzzini Srl Method and electronic protective device for electrical equipment, in particular for hydromassage baths, saunas, showers and mini-pools.

Similar Documents

Publication Publication Date Title
ES517207A0 (en) IMPROVEMENTS IN AN ELECTRICAL CONTACTOR.
FR2371805A1 (en) Electrical appliance earth fault protection circuit - uses two step level relays one controlling alarm and supply interruption
GB2021337A (en) An electrical protection device
ES449119A1 (en) Protection circuits
DE3370413D1 (en) Three-phase power supply unit
ES454612A1 (en) ONE FAULT CURRENT PROTECTION SWITCH.
ATE152299T1 (en) RESIDUAL CURRENT PROTECTION BREAKER
SU113419A1 (en) Current protection zero sequence electrical installations
ATE3486T1 (en) RESIDUAL CURRENT CIRCUIT BREAKER WITH PREMAGNETIZED CORE.
SU589660A1 (en) Device for protection of step-down transformer with isolated neutral wire in substation without switches on higher voltage side
GB2135542A (en) Earth leakage circuit breaker
SU1112474A1 (en) Device for differential protecting of three-phase motor
JPS5728559A (en) Short circuit protector for field of synchronous generator
ES2102954A1 (en) Differential circuit-breaker with automatic reset device.
FR2332638A1 (en) Protection against homopolar losses in multiphase supplies - has milli joule threshold level using resonant circuit with two secondary windings on toroidal core
GB1532084A (en) Earth leakage circuit breaker
GB721519A (en) Improvements in or relating to protective arrangements for radio frequency generators
JPS5757040A (en) Switching control system for n versus 1 constitution
GB521730A (en) Improvements in or relating to control and protective systems for electrical apparatus
JPS51121753A (en) Relay
FR2335850A1 (en) Electrical base heating system failure signalling - uses current threshold level relays in all phases of power supply
JPS54142684A (en) Underground conductor protecting device
JPS5343316A (en) Operation control system for electric car
JPS5479381A (en) Power source device of remote controller
JPS5635696A (en) Control circuit for synchronous motor

Legal Events

Date Code Title Description
RE Withdrawal of published application