GB540973A - Improvements in or relating to electric protective systems - Google Patents
Improvements in or relating to electric protective systemsInfo
- Publication number
- GB540973A GB540973A GB409840A GB409840A GB540973A GB 540973 A GB540973 A GB 540973A GB 409840 A GB409840 A GB 409840A GB 409840 A GB409840 A GB 409840A GB 540973 A GB540973 A GB 540973A
- Authority
- GB
- United Kingdom
- Prior art keywords
- earth
- faults
- winding
- current
- close
- 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
- H02H3/26—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
- H02H3/28—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
- H02H3/286—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus involving comparison of similar homopolar quantities
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
540,973. Protective cut-out systems. GENERAL ELECTRIC CO., Ltd., ABBOTT, A., and GARRARD, C. J. O. March 5, 1940, No. 4098. [Class 38 (v)] A bus-bar system 3, preferably of the metalclad type subject to earth-faults only, is protected against such faults by a biassed differential relay 15, the operating winding 1A of which is energized by the total unbalance from current-transformer groups 10 -. 13 in all the circuits connected to the bars, whereas the restraining winding 22 is energized by the total resultant neutral-to-earth current from current transformers 20, 21 in one or more connections 18, 19 of generators 1, 2, and in series with the coil 23 of an earth-leakage relay having its contacts 26 in series with contacts 25 of the differential relay in a master trip-circuit for all the breakers. With earth-faults on the bars 3, winding 1A overpowers winding 22 and, as 26 also close, tripping results. With external earth-faults, the out-of-balance current in 1A, due to saturation, is insufficient to close 25, so no tripping occurs. With external phasefaults, 23 does not close 26, so again no tripping occurs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB409840A GB540973A (en) | 1940-03-05 | 1940-03-05 | Improvements in or relating to electric protective systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB409840A GB540973A (en) | 1940-03-05 | 1940-03-05 | Improvements in or relating to electric protective systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB540973A true GB540973A (en) | 1941-11-07 |
Family
ID=9770718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB409840A Expired GB540973A (en) | 1940-03-05 | 1940-03-05 | Improvements in or relating to electric protective systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB540973A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2161752A1 (en) * | 1971-10-27 | 1973-07-13 | Edf | |
| FR2444359A1 (en) * | 1978-12-12 | 1980-07-11 | Barthelemy Louis | Power equipment circuit for electrocution protection - overcomes sensitivity problems by measuring imbalance between abnormal earth leakage currents, power input and power output currents |
-
1940
- 1940-03-05 GB GB409840A patent/GB540973A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2161752A1 (en) * | 1971-10-27 | 1973-07-13 | Edf | |
| FR2444359A1 (en) * | 1978-12-12 | 1980-07-11 | Barthelemy Louis | Power equipment circuit for electrocution protection - overcomes sensitivity problems by measuring imbalance between abnormal earth leakage currents, power input and power output currents |
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