MW3178A1 - Improvements in and relating to earth fault relays - Google Patents

Improvements in and relating to earth fault relays

Info

Publication number
MW3178A1
MW3178A1 MW31/78A MW3178A MW3178A1 MW 3178 A1 MW3178 A1 MW 3178A1 MW 31/78 A MW31/78 A MW 31/78A MW 3178 A MW3178 A MW 3178A MW 3178 A1 MW3178 A1 MW 3178A1
Authority
MW
MALAWI
Prior art keywords
relating
earth fault
fault relays
relays
earth
Prior art date
Application number
MW31/78A
Original Assignee
Electrical Protection Co Ltd
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 Electrical Protection Co Ltd filed Critical Electrical Protection Co Ltd
Publication of MW3178A1 publication Critical patent/MW3178A1/en

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
    • H02H3/027—Details with automatic disconnection after a predetermined time
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/06—Arrangements for supplying operative power
    • H02H1/063—Arrangements for supplying operative power primary power being supplied by fault current
    • 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)
MW31/78A 1977-10-21 1978-10-21 Improvements in and relating to earth fault relays MW3178A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA00776276A ZA776276B (en) 1977-10-21 1977-10-21 Improvements in and relating to earth fault relays

Publications (1)

Publication Number Publication Date
MW3178A1 true MW3178A1 (en) 1980-03-12

Family

ID=25572172

Family Applications (1)

Application Number Title Priority Date Filing Date
MW31/78A MW3178A1 (en) 1977-10-21 1978-10-21 Improvements in and relating to earth fault relays

Country Status (5)

Country Link
AU (1) AU530808B2 (en)
GB (1) GB2006555B (en)
MW (1) MW3178A1 (en)
NZ (1) NZ188723A (en)
ZA (1) ZA776276B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8616833D0 (en) * 1986-07-10 1986-08-20 Delta Electrical Holdings Earth leakage protective circuit
DE102020216414A1 (en) 2020-12-21 2022-06-23 Siemens Aktiengesellschaft RCDs and procedures

Also Published As

Publication number Publication date
AU530808B2 (en) 1983-07-28
GB2006555B (en) 1982-04-07
ZA776276B (en) 1978-12-27
GB2006555A (en) 1979-05-02
NZ188723A (en) 1981-07-13
AU4091578A (en) 1980-04-24

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