FR2442525A1 - Differential transformer for detecting earth currents - controls biassed relay with parallel diode for short-circuiting HF parasitic signals - Google Patents

Differential transformer for detecting earth currents - controls biassed relay with parallel diode for short-circuiting HF parasitic signals

Info

Publication number
FR2442525A1
FR2442525A1 FR7832751A FR7832751A FR2442525A1 FR 2442525 A1 FR2442525 A1 FR 2442525A1 FR 7832751 A FR7832751 A FR 7832751A FR 7832751 A FR7832751 A FR 7832751A FR 2442525 A1 FR2442525 A1 FR 2442525A1
Authority
FR
France
Prior art keywords
relay
parasitic signals
controls
differential transformer
biassed
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
FR7832751A
Other languages
French (fr)
Other versions
FR2442525B1 (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.)
APP ELECTR
Original Assignee
APP 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 APP ELECTR filed Critical APP ELECTR
Priority to FR7832751A priority Critical patent/FR2442525A1/en
Publication of FR2442525A1 publication Critical patent/FR2442525A1/en
Application granted granted Critical
Publication of FR2442525B1 publication Critical patent/FR2442525B1/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
    • H02H3/26—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
    • H02H3/34—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 of a three-phase system
    • H02H3/347—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 of a three-phase system using summation current transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/04—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Transformers (AREA)

Abstract

A device for providing protection for electrical installations against earth fault currents comprises a differential transformer (T) on the magnetic core (To) of which are wound four primary coils (E1-E4) connected to three phase conductors (1-3) and a neutral conductor (N), and a secondary coil (E3) connected to a biased relay (R) which controls a switch (DI) in the conductor circuit. A diode (D) is connected in parallel with the relay (R) in the same polarity and has a conduction threshold greater than that of the relay, for example 700mV compared with 100mV. The diode short circuits any Rf parasitic signals while not affecting the relay normal operation, and thus prevents inadvertent operation of the relay (R) by parasitic signals.
FR7832751A 1978-11-21 1978-11-21 Differential transformer for detecting earth currents - controls biassed relay with parallel diode for short-circuiting HF parasitic signals Granted FR2442525A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7832751A FR2442525A1 (en) 1978-11-21 1978-11-21 Differential transformer for detecting earth currents - controls biassed relay with parallel diode for short-circuiting HF parasitic signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7832751A FR2442525A1 (en) 1978-11-21 1978-11-21 Differential transformer for detecting earth currents - controls biassed relay with parallel diode for short-circuiting HF parasitic signals

Publications (2)

Publication Number Publication Date
FR2442525A1 true FR2442525A1 (en) 1980-06-20
FR2442525B1 FR2442525B1 (en) 1981-04-17

Family

ID=9215112

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7832751A Granted FR2442525A1 (en) 1978-11-21 1978-11-21 Differential transformer for detecting earth currents - controls biassed relay with parallel diode for short-circuiting HF parasitic signals

Country Status (1)

Country Link
FR (1) FR2442525A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0813283A1 (en) * 1996-06-14 1997-12-17 Schneider Electric Sa Differential protection device having immunity against nuisance tripping

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1358638A (en) * 1963-03-08 1964-04-17 Bresson Faille Marchand Ets Overload limiter for earth leakage protection devices against electrocution
FR1510073A (en) * 1966-12-07 1968-01-19 Cie De Construction Electr Improvements to differential circuit breakers
FR1553951A (en) * 1967-12-06 1969-01-17
FR1557120A (en) * 1967-12-27 1969-02-14
FR2087280A5 (en) * 1970-05-13 1971-12-31 Saparel
FR2124491A3 (en) * 1971-02-04 1972-09-22 It

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1358638A (en) * 1963-03-08 1964-04-17 Bresson Faille Marchand Ets Overload limiter for earth leakage protection devices against electrocution
FR1510073A (en) * 1966-12-07 1968-01-19 Cie De Construction Electr Improvements to differential circuit breakers
FR1553951A (en) * 1967-12-06 1969-01-17
FR1557120A (en) * 1967-12-27 1969-02-14
FR2087280A5 (en) * 1970-05-13 1971-12-31 Saparel
FR2124491A3 (en) * 1971-02-04 1972-09-22 It

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0813283A1 (en) * 1996-06-14 1997-12-17 Schneider Electric Sa Differential protection device having immunity against nuisance tripping
FR2749987A1 (en) * 1996-06-14 1997-12-19 Schneider Electric Sa IMMERSE DIFFERENTIAL PROTECTION DEVICE AGAINST INTEMPTIVE TRIPPING

Also Published As

Publication number Publication date
FR2442525B1 (en) 1981-04-17

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Legal Events

Date Code Title Description
ST Notification of lapse