GB1309972A - Protective arrangement against earth leakage currents for a multi- phase electric supply line - Google Patents

Protective arrangement against earth leakage currents for a multi- phase electric supply line

Info

Publication number
GB1309972A
GB1309972A GB2411671A GB2411671A GB1309972A GB 1309972 A GB1309972 A GB 1309972A GB 2411671 A GB2411671 A GB 2411671A GB 2411671 A GB2411671 A GB 2411671A GB 1309972 A GB1309972 A GB 1309972A
Authority
GB
United Kingdom
Prior art keywords
circuit
breaker
series
earth leakage
secondary winding
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.)
Expired
Application number
GB2411671A
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.)
Societe dAppareillage Electrique SAPAREL SA
Original Assignee
Societe dAppareillage Electrique SAPAREL 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 Societe dAppareillage Electrique SAPAREL SA filed Critical Societe dAppareillage Electrique SAPAREL SA
Publication of GB1309972A publication Critical patent/GB1309972A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/32—Circuit arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
    • H01F27/422—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers
    • H01F27/427—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers for current transformers
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Transformers (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

1309972 Protective arrangements SOC D APPAREILLAGE ELECTRIQUE SAPAREL 19 April 1971 [16 March 1970] 24116/71 Heading H2K In an earth leakage protective arrangement comprising a core-balance transformer 1 having its secondary winding 2 supplying a relay 3 controlling a circuit-breaker 20, any residual magnetism is removed from the transformer core by the automatic connection of a demagnetizing circuit to the secondary winding when the circuit-breaker opens. The demagnetizing circuit is connected by a changeover switch 6 formed by time delayed contacts of the circuit-breaker 20, or by the contacts of a further relay having its coil connected downstream of the circuit-breaker. The demagnetizing circuit may comprise an A.C. source 4 in series with a positive temperature coefficient resistor 5, or in parallel with a negative temperature coefficient resistor, Fig. 2 (not shown). In a further arrangement, the winding 2 is connected through the switch in series with the A.C. terminals of a bridge rectifier to two conductors of the protected supply, a capacitor being connected across the D.C. terminals of the bridge, Fig. 3 (not shown). In another arrangement a charged capacitor in series with an inductor is connected across the secondary winding on the opening of the circuit-breaker, Fig. 4 (not shown).
GB2411671A 1970-03-16 1971-04-19 Protective arrangement against earth leakage currents for a multi- phase electric supply line Expired GB1309972A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7009286A FR2081183A1 (en) 1970-03-16 1970-03-16

Publications (1)

Publication Number Publication Date
GB1309972A true GB1309972A (en) 1973-03-14

Family

ID=9052292

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2411671A Expired GB1309972A (en) 1970-03-16 1971-04-19 Protective arrangement against earth leakage currents for a multi- phase electric supply line

Country Status (6)

Country Link
BE (1) BE763766A (en)
DE (1) DE2112326A1 (en)
ES (1) ES389199A1 (en)
FR (1) FR2081183A1 (en)
GB (1) GB1309972A (en)
NL (1) NL7103097A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1936772A3 (en) * 2002-11-08 2010-04-07 Eaton Electric Limited Residual current devices
CN112243530A (en) * 2018-05-16 2021-01-19 黑格尔电镀物品股份公司 Electrical differential switching device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR946815A (en) * 1947-05-14 1949-06-15 Device for demagnetizing iron or steel parts
FR1235318A (en) * 1957-08-10 1960-07-08 Remanent contactor or circuit breaker fitted with a differential relay

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1936772A3 (en) * 2002-11-08 2010-04-07 Eaton Electric Limited Residual current devices
CN112243530A (en) * 2018-05-16 2021-01-19 黑格尔电镀物品股份公司 Electrical differential switching device
CN112243530B (en) * 2018-05-16 2023-09-05 黑格尔电镀物品股份公司 Electrical Differential Switching Device

Also Published As

Publication number Publication date
FR2081183A1 (en) 1971-12-03
BE763766A (en) 1971-09-06
ES389199A1 (en) 1974-05-01
NL7103097A (en) 1971-09-20
DE2112326A1 (en) 1971-09-30

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees