GB469143A - Improvements in or relating to earth leakage protective means for electrical apparatus - Google Patents
Improvements in or relating to earth leakage protective means for electrical apparatusInfo
- Publication number
- GB469143A GB469143A GB702936A GB702936A GB469143A GB 469143 A GB469143 A GB 469143A GB 702936 A GB702936 A GB 702936A GB 702936 A GB702936 A GB 702936A GB 469143 A GB469143 A GB 469143A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fuse
- supply
- current transformer
- primary
- heating coil
- 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
- H02H3/08—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 excess current
- H02H3/10—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 excess current additionally responsive to some other abnormal electrical conditions
- H02H3/105—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 excess current additionally responsive to some other abnormal electrical conditions responsive to excess current and fault current to earth
Landscapes
- Breakers (AREA)
Abstract
469,143. Protective cut-out arrangements. CHELLIS, G. F. March 9, 1936, No. 7029. [Class 38 (v)] [Also in Group XXXVI] The fuse 5 in the unearthed line of the supply to the apparatus 3 is adapted, when the insulation of 3 breaks down, to be melted by a heating coil 7, which is energized by the secondary 6 of a variable-ratio current transformer having its primary in the earthing conductor 4 of the apparatus-frame. The wire 5 is surrounded by a refractory insulating tube 8 on which the heating coil 7 is wound, the heater being covered by layers of asbestos tape or an asbestos jacket 9. With a polyphase supply, the current transformer has three secondaries, one for each phase. The fuse may, alternatively, open the holding circuit of a breaker, and may be replaced by a fluid capsule or bimetal strip controlling a holding or trip circuit. The Specification refers also to interrupting the whole of the supply from a power transformer to a faulty distribution system, one terminal of the secondary of the power transformer being earthed through the primary of the current transformer, and the other terminal being connected to the line carrying the fuse.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB702936A GB469143A (en) | 1936-03-09 | 1936-03-09 | Improvements in or relating to earth leakage protective means for electrical apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB702936A GB469143A (en) | 1936-03-09 | 1936-03-09 | Improvements in or relating to earth leakage protective means for electrical apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB469143A true GB469143A (en) | 1937-07-20 |
Family
ID=9825275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB702936A Expired GB469143A (en) | 1936-03-09 | 1936-03-09 | Improvements in or relating to earth leakage protective means for electrical apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB469143A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2595251A (en) * | 1948-02-26 | 1952-05-06 | Us Interior | Short-circuiting contactor for direct-current circuits |
US2842718A (en) * | 1953-09-28 | 1958-07-08 | Ohio Brass Co | Circuit interrupters |
US3064161A (en) * | 1957-11-18 | 1962-11-13 | Tor A Albertsson | Electric safety means |
-
1936
- 1936-03-09 GB GB702936A patent/GB469143A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2595251A (en) * | 1948-02-26 | 1952-05-06 | Us Interior | Short-circuiting contactor for direct-current circuits |
US2842718A (en) * | 1953-09-28 | 1958-07-08 | Ohio Brass Co | Circuit interrupters |
US3064161A (en) * | 1957-11-18 | 1962-11-13 | Tor A Albertsson | Electric safety means |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2429162A (en) | Starting and operating of fluorescent lamps | |
GB469143A (en) | Improvements in or relating to earth leakage protective means for electrical apparatus | |
GB679789A (en) | Improvements in and relating to earth leakage protection for single phase a.c. circuits | |
US2246318A (en) | Power transformer | |
US2370037A (en) | Protective device for electrical apparatus and systems | |
US1652346A (en) | Multiphase thermally-actuated circuit controller | |
US2019866A (en) | Protective system for electric meters | |
US2530935A (en) | Thermal protective device for electronic devices | |
US2404614A (en) | Electric control circuit | |
US2238626A (en) | Relay and relay protective system | |
US2400749A (en) | Protective arrangement | |
US2336872A (en) | Protection of alternating current electric power systems | |
US1988121A (en) | Protective means for delta connected transmission lines | |
US1817486A (en) | Electrical protective device | |
US2034518A (en) | Protection of electric systems | |
US1839154A (en) | Mercury vapor rectifier | |
GB422851A (en) | Improvements in or relating to the protection of electric water heating apparatus | |
US1723911A (en) | System of electrical distribution | |
US2106211A (en) | Electrical apparatus | |
GB551090A (en) | Improvements in electric cut-out or protective systems with automatic circuit breakers | |
US1310821A (en) | Protective relay system | |
GB560429A (en) | Improvements in and relating to systems of protection for electric power circuits | |
US2933616A (en) | Inductive apparatus | |
USRE18740E (en) | breisky | |
GB760126A (en) | Improvements in electric heating temperature-controlling means |