GB767189A - Improvements in or relating to electric protective systems - Google Patents
Improvements in or relating to electric protective systemsInfo
- Publication number
- GB767189A GB767189A GB3206755A GB3206755A GB767189A GB 767189 A GB767189 A GB 767189A GB 3206755 A GB3206755 A GB 3206755A GB 3206755 A GB3206755 A GB 3206755A GB 767189 A GB767189 A GB 767189A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rectifier
- transformer
- relay
- current
- supplied
- 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)
- Protection Of Transformers (AREA)
Abstract
767,189. Protective cut-out systems. GENERAL ELECTRIC CO., Ltd. Dec. 9, 1953, No. 3206755. Divided out of 767,188. Class 38(5) In a circulating-current protective system for power transformer in which a relay 27 is supplied with operating current over a rectifier 36, operation of the relay due to through-faults or magnetizing currents is prevented by a further rectifier or rectifiers connected in parallel with the relay and arranged to provide a low impedance shunt path to the relay when supplied with alternating current. The Figure shows the arrangement for one of the phases of a delta-star transformer, the primary winding 14 of a load bias transformer 21 being connected in one of the circulating-current lines and the primary winding 17 of a differential current transformer 25 being connected between the winding 14 and the star point of the line current transformers on the delta side of the transformer. One secondary winding 34 of the transformer 25 is connected to the rectifier 36 through a tuned circuit 37...39, and the other secondary winding 35 is connected to a rectifier 41 which in combination with a rectifier 22 and a resistor 40 is connected in shunt with the relay, the rectifier 22 being connected to the secondary winding 20 of the load bias transformer 21. The turns ratio of the transformer 25 and the tuning of the impedances 37...39 is such that the operating current supplied to the rectifier 36 is dependent on the fundamental frequency whilst that supplied to the rectifier 41 is dependent on the second harmonic. In the event of an internal fault in the transformer, the winding 34 supplies current through the rectifier 36 to operate the re, lay 27, but in the event of through-fault tne energizing of the rectifier 22 causes the operating current from the rectifier 36 to flow through the shunt circuit rather than through the relay and in the event of magnetizing currents the rectifier 41 has a similar effect, the relay being prevented from operating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3206755A GB767189A (en) | 1953-12-09 | 1953-12-09 | Improvements in or relating to electric protective systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3206755A GB767189A (en) | 1953-12-09 | 1953-12-09 | Improvements in or relating to electric protective systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB767189A true GB767189A (en) | 1957-01-30 |
Family
ID=10332673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3206755A Expired GB767189A (en) | 1953-12-09 | 1953-12-09 | Improvements in or relating to electric protective systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB767189A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0014175A1 (en) * | 1979-01-17 | 1980-08-06 | Fuji Electric Co. Ltd. | Differential safety system for a multiphase transformer |
-
1953
- 1953-12-09 GB GB3206755A patent/GB767189A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0014175A1 (en) * | 1979-01-17 | 1980-08-06 | Fuji Electric Co. Ltd. | Differential safety system for a multiphase transformer |
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