GB579026A - Improvements in and relating to the protection of synchronous electric motors - Google Patents
Improvements in and relating to the protection of synchronous electric motorsInfo
- Publication number
- GB579026A GB579026A GB2232544A GB2232544A GB579026A GB 579026 A GB579026 A GB 579026A GB 2232544 A GB2232544 A GB 2232544A GB 2232544 A GB2232544 A GB 2232544A GB 579026 A GB579026 A GB 579026A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- motor
- protection
- fuse
- excitation
- 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
- H02H7/08—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 dynamo-electric motors
- H02H7/085—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 dynamo-electric motors against excessive load
Abstract
579,026. Protective cut-out arrangements. BRITISH THOMSON-HOUSTON CO., Ltd., and LIDDIARD, H. W. C. Nov. 13, 1944, No. 22325. [Class 38 (v)] Protection of a synchronous motor SM against heavy circulating currents which flow when, due to the opening and automatic reclosure of one of the breakers CB1. &c. an out-of-phase condition is established between the restored supply volts and the voltage generated by the stillrunning motor, is effected by connecting in the motor excitation-circuit a high-speed, h.r.c. fuse F, which is ruptured by the compensating A.C. component superimposed on the normal D.C. exciting current, and opens the field circuit, the resulting increase in the motorreactance then limiting the circulating current to a non-dangerous value. To deal with moderate out-of-phase conditions, the breaker CB is tripped by a relay R sensitive only to the A.C. component in the excitation-circuit. A discharge circuit DR, prevents undue voltagerise on rupture of the fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2232544A GB579026A (en) | 1944-11-13 | 1944-11-13 | Improvements in and relating to the protection of synchronous electric motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2232544A GB579026A (en) | 1944-11-13 | 1944-11-13 | Improvements in and relating to the protection of synchronous electric motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB579026A true GB579026A (en) | 1946-07-19 |
Family
ID=10177558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2232544A Expired GB579026A (en) | 1944-11-13 | 1944-11-13 | Improvements in and relating to the protection of synchronous electric motors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB579026A (en) |
-
1944
- 1944-11-13 GB GB2232544A patent/GB579026A/en not_active Expired
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