GB970295A - Improvements in or relating to earth fault protection for electrical supply systems - Google Patents

Improvements in or relating to earth fault protection for electrical supply systems

Info

Publication number
GB970295A
GB970295A GB39445/61A GB3944561A GB970295A GB 970295 A GB970295 A GB 970295A GB 39445/61 A GB39445/61 A GB 39445/61A GB 3944561 A GB3944561 A GB 3944561A GB 970295 A GB970295 A GB 970295A
Authority
GB
United Kingdom
Prior art keywords
return
earth
relating
electrical supply
supply systems
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
GB39445/61A
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.)
HEINEMANN ELECTRIC SOUTH AFRICA Ltd
Original Assignee
HEINEMANN ELECTRIC SOUTH AFRICA 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 HEINEMANN ELECTRIC SOUTH AFRICA Ltd filed Critical HEINEMANN ELECTRIC SOUTH AFRICA Ltd
Publication of GB970295A publication Critical patent/GB970295A/en
Expired 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
    • H02H3/33—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

Abstract

970,295. Protective cut-out arrangements. HEINEMANN ELECTRIC SOUTH AFRICA Ltd. Nov. 3, 1961 [Nov. 7, 1960], No. 39445/61. Heading H2K. A circuit-breaker 5 in a single-phase A.C. system fed from a transformer 6 has an overload trip-coil 12, an earth leakage trip coil 8 fed from a current balance arrangement 7 in the line 2 and return 4, and a further trip coil 10 connected between the return 4 and earth 9 so as to be energized if the return is broken between the transformer 6 and the circuit-breaker. The return 4 may have a series of earth connections as shown, the reference 11 indicating local earth resistance.
GB39445/61A 1960-11-07 1961-11-03 Improvements in or relating to earth fault protection for electrical supply systems Expired GB970295A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA604536 1960-11-07

Publications (1)

Publication Number Publication Date
GB970295A true GB970295A (en) 1964-09-16

Family

ID=25560545

Family Applications (1)

Application Number Title Priority Date Filing Date
GB39445/61A Expired GB970295A (en) 1960-11-07 1961-11-03 Improvements in or relating to earth fault protection for electrical supply systems

Country Status (1)

Country Link
GB (1) GB970295A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687906A (en) * 1983-11-15 1987-08-18 Matsushita Electric Works, Ltd. Portable electric hair dryer with electric shock protection circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687906A (en) * 1983-11-15 1987-08-18 Matsushita Electric Works, Ltd. Portable electric hair dryer with electric shock protection circuit

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