GB176134A - Improvements in and relating to methods of protecting electric transformers - Google Patents
Improvements in and relating to methods of protecting electric transformersInfo
- Publication number
- GB176134A GB176134A GB3394220A GB3394220A GB176134A GB 176134 A GB176134 A GB 176134A GB 3394220 A GB3394220 A GB 3394220A GB 3394220 A GB3394220 A GB 3394220A GB 176134 A GB176134 A GB 176134A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reactance
- transformer
- main transformer
- primary
- transformers
- 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
- H02H7/04—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 for transformers
- H02H7/045—Differential protection of transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
176,134. British Thomson - Houston Co., Ltd., and Holbrook, H. S. Dec. 1, 1920. Transformers.-In a circulating-current system for protecting a transformer, in which current transformers 5, 6 are provided in the primary and secondary circuits of the main transformer to be protected, a trip coil 7 being connected in shunt across the secondaries of the transformers 5, 6, a reactance 10 is placed in parallel with the primary 2 of the main transformer and is connected across the terminals of the secondary of the transformer 5 in order to compensate for differences in the ratio of the input and output currents of the main transformer. These differences may be caused by variations in the supply voltage and the load, or by the rush of magnetizing-current which takes place when the main transformer is connected to the supply circuit. The core of the reactance is made of the same material and is worked at the same flux density as that of the main transformer in order that the current taken by the reactance may bear a constant ratio to that taken by the main tranformer. In order that a small reactance may be used, the reactance is preferably connected in series with the secondary 9 of a potential transformer whose primary 8 is in parallel with the primary 2 of the main transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3394220A GB176134A (en) | 1920-12-01 | 1920-12-01 | Improvements in and relating to methods of protecting electric transformers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3394220A GB176134A (en) | 1920-12-01 | 1920-12-01 | Improvements in and relating to methods of protecting electric transformers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB176134A true GB176134A (en) | 1922-03-01 |
Family
ID=10359364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3394220A Expired GB176134A (en) | 1920-12-01 | 1920-12-01 | Improvements in and relating to methods of protecting electric transformers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB176134A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2551022A (en) * | 1945-11-30 | 1951-05-01 | Allis Chalmers Mfg Co | Electric protective system with inrush current compensation |
-
1920
- 1920-12-01 GB GB3394220A patent/GB176134A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2551022A (en) * | 1945-11-30 | 1951-05-01 | Allis Chalmers Mfg Co | Electric protective system with inrush current compensation |
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