GB782119A - Improvements in and relating to protective earthing arrangements for electrical apparatus - Google Patents
Improvements in and relating to protective earthing arrangements for electrical apparatusInfo
- Publication number
- GB782119A GB782119A GB2964954A GB2964954A GB782119A GB 782119 A GB782119 A GB 782119A GB 2964954 A GB2964954 A GB 2964954A GB 2964954 A GB2964954 A GB 2964954A GB 782119 A GB782119 A GB 782119A
- Authority
- GB
- United Kingdom
- Prior art keywords
- earth
- contactor
- casing
- opens
- 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
Links
- 230000001681 protective effect Effects 0.000 title abstract 3
- 238000004804 winding Methods 0.000 abstract 3
- 230000015556 catabolic process Effects 0.000 abstract 1
- 230000002950 deficient Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000009413 insulation Methods 0.000 abstract 1
- 238000010079 rubber tapping Methods 0.000 abstract 1
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
- H02H3/16—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 fault current to earth, frame or mass
- H02H3/162—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 fault current to earth, frame or mass for AC systems
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
782,119. Protective cut-out arrangements. GENERAL ELECTRIC CO., Ltd. Oct. 3, 1955 [Oct. 14, 1954], No. 29649/54. Class 38 (5). In an earth leakage protective arrangement, a transformer 4 has a centre-tapped secondary winding with its ends connected to the casing of a protected apparatus 1 and its centre tapping connected to earth 7 through a current-sensitive device which is actuated in the event of an insulation breakdown of the apparatus 1 to give an indication or effect a control. In the arrangement shown, earth fault current flowing through earth leads 10, 11, the secondary winding and a relay 6 to earth 7 opens the contacts of the relay 6 to de-energize the closing coil of a contactor 3 to interrupt the supply to the apparatus 1. Current normally circulates from the secondary winding through the coils of relays 8, 9, the leads 10, 11 and the casing of the apparatus so that should either earth connection become defective relays 8 and 9 are de-energized to open their contacts in series with the contactor closing coil and so open the contactor. The casing of the apparatus may also be connected through a further earth lead 12, a test switch 13 and the trip coil 14 of an earth leakage circuit-breaker 5 to an auxiliary earth 15, so that should a potential build up on the casing of the apparatus, the circuit-breaker 5 is tripped open. This opens the supply to the transformer 4 and to the closing coil of the contactor 3 which opens to disconnect the apparatus 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2964954A GB782119A (en) | 1954-10-14 | 1954-10-14 | Improvements in and relating to protective earthing arrangements for electrical apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2964954A GB782119A (en) | 1954-10-14 | 1954-10-14 | Improvements in and relating to protective earthing arrangements for electrical apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB782119A true GB782119A (en) | 1957-09-04 |
Family
ID=10294898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2964954A Expired GB782119A (en) | 1954-10-14 | 1954-10-14 | Improvements in and relating to protective earthing arrangements for electrical apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB782119A (en) |
-
1954
- 1954-10-14 GB GB2964954A patent/GB782119A/en not_active Expired
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