GB882300A - Improvements in or relating to control circuits for electric relays - Google Patents
Improvements in or relating to control circuits for electric relaysInfo
- Publication number
- GB882300A GB882300A GB8968/59A GB896859A GB882300A GB 882300 A GB882300 A GB 882300A GB 8968/59 A GB8968/59 A GB 8968/59A GB 896859 A GB896859 A GB 896859A GB 882300 A GB882300 A GB 882300A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- coil
- capacitor
- switch
- latch
- 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
- H02H7/22—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 distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—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 distribution gear, e.g. bus-bar systems; for switching devices for switches
- H02H7/224—Anti-pump circuits
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
882,300. Protective arrangements. WESTINGHOUSE ELECTRIC CORPORATION. March 16, 1959 [March 20, 1958], No. 8968/59. Class 38 (5). The cycling or hunting of a " latch type " relay 11, should a control switch 31 be held closed when the relay is tripped open, is prevented by a capacitor 22 connected in series with the closing coil 12 of the relay. In the alternator control circuit shown, the charging current through the capacitor 22 on closure of the switch 31 energizes the coil 12 sufficiently for the relay to close and be latched closed by a latch 13. The relay 11 opens contacts 19 to open the circuit of the coil 12 and closes contacts 20 to enable the capacitor to be fully charged. If, now, protective relays 26 close contacts 27, the latch is released by the coil 14 and the relay 11 opens. If the switch 31 has been held closed, the relay does not reclose automatically as the charged capacitor prevents further flow of current through the coil 12. On the release of the switch 31, the capacitor discharges through a resistor 34 and rectifier 32 to prepare the circuit for a further closing operation. Specification 868,253 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US882300XA | 1958-03-20 | 1958-03-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB882300A true GB882300A (en) | 1961-11-15 |
Family
ID=22210143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8968/59A Expired GB882300A (en) | 1958-03-20 | 1959-03-16 | Improvements in or relating to control circuits for electric relays |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB882300A (en) |
-
1959
- 1959-03-16 GB GB8968/59A patent/GB882300A/en not_active Expired
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