GB579520A - Improvements in and relating to protective arrangements for alternating current systems - Google Patents
Improvements in and relating to protective arrangements for alternating current systemsInfo
- Publication number
- GB579520A GB579520A GB914144A GB914144A GB579520A GB 579520 A GB579520 A GB 579520A GB 914144 A GB914144 A GB 914144A GB 914144 A GB914144 A GB 914144A GB 579520 A GB579520 A GB 579520A
- Authority
- GB
- United Kingdom
- Prior art keywords
- windings
- relay
- operating
- energized
- restraining
- 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
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
579,520. Protective cut-out systems. GENERAL ELECTRIC CO., Ltd., and ABBOTT, A. May 12, 1944, No. 9141. [Class 38 (v)] Each end of a zone to be protected has an induction relay comprising a field magnet 3 and operating magnet 4, the latter having opposed operating windings 9 and restraining windings 10, both energized from a winding 8 inductively energized by the field coil 6. The windings 8, 10 are in series over pilot conductors 11, whereby normally each relay is restrained in proportion to the currents at both ends, whereas the operating effect is responsive only to current at the one end and is arranged to be about 20 per cent. less than the restraining effect. On internal fault, the " incoming" relay circulates more of the increase through the operating winding which overcomes the restraint and operates the relay. On through-faults, the restraining effect which is proportional to the through-current, prevents operation. Undesired operation by H.F. transients of steep wave-front is prevented by non-induction shunts 13. The windings 6, 9, 10 may alternatively be separately energized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB914144A GB579520A (en) | 1944-05-12 | 1944-05-12 | Improvements in and relating to protective arrangements for alternating current systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB914144A GB579520A (en) | 1944-05-12 | 1944-05-12 | Improvements in and relating to protective arrangements for alternating current systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB579520A true GB579520A (en) | 1946-08-07 |
Family
ID=9866155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB914144A Expired GB579520A (en) | 1944-05-12 | 1944-05-12 | Improvements in and relating to protective arrangements for alternating current systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB579520A (en) |
-
1944
- 1944-05-12 GB GB914144A patent/GB579520A/en not_active Expired
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