GB805456A - Improvements relating to earth fault protection for electrical equipment - Google Patents
Improvements relating to earth fault protection for electrical equipmentInfo
- Publication number
- GB805456A GB805456A GB20757A GB20757A GB805456A GB 805456 A GB805456 A GB 805456A GB 20757 A GB20757 A GB 20757A GB 20757 A GB20757 A GB 20757A GB 805456 A GB805456 A GB 805456A
- Authority
- GB
- United Kingdom
- Prior art keywords
- link
- earth
- earth fault
- neutral
- trip
- 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
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
- H02H3/044—Checking correct functioning of protective arrangements, e.g. by simulating a fault
Landscapes
- Breakers (AREA)
Abstract
805,456. Protective cut-out arrangements. BRITISH THOMSON-HOUSTON CO. Ltd. Jan. 2, 1957, No. 207/57. Class 38 (5). In an earth fault protective arrangement in which the earth fault trip coil EC of a circuitbreaker CB is energized from the secondary winding S of a current transformer CT in the neutral-earth connection of a power transformer PT having a star-connected secondary winding and in which the neutral earth connection includes a disconnectible link NL, the trip circuit is completed through the neutral link so that energization of a test winding T would not cause the tripping of the circuit-breaker and indicate that the protective arrangement is in order when the link is open. In the arrangement shown, one connection from the trip coil EC is to the pivot of the link NL so that when the link is open, the trip circuit is not only opened but also disconnected from earth so that insulation testing may be effected. In a modification, Fig. 2 (not shown), the whole of the link NL is included in the trip circuit which is provided with a further disconnectible link to permit insulation testing. Specification 802,746 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB20757A GB805456A (en) | 1957-01-02 | 1957-01-02 | Improvements relating to earth fault protection for electrical equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB20757A GB805456A (en) | 1957-01-02 | 1957-01-02 | Improvements relating to earth fault protection for electrical equipment |
Publications (1)
Publication Number | Publication Date |
---|---|
GB805456A true GB805456A (en) | 1958-12-03 |
Family
ID=9700289
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB20757A Expired GB805456A (en) | 1957-01-02 | 1957-01-02 | Improvements relating to earth fault protection for electrical equipment |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB805456A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3058035A (en) * | 1959-10-26 | 1962-10-09 | Chester W Brown | Ground sensing and protective unit |
US4525764A (en) * | 1982-06-10 | 1985-06-25 | Titus Charles H | System for disconnecting an electrical power source from a load |
-
1957
- 1957-01-02 GB GB20757A patent/GB805456A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3058035A (en) * | 1959-10-26 | 1962-10-09 | Chester W Brown | Ground sensing and protective unit |
US4525764A (en) * | 1982-06-10 | 1985-06-25 | Titus Charles H | System for disconnecting an electrical power source from a load |
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