GB906633A - Improvements relating to electrical control systems - Google Patents
Improvements relating to electrical control systemsInfo
- Publication number
- GB906633A GB906633A GB445058A GB445058A GB906633A GB 906633 A GB906633 A GB 906633A GB 445058 A GB445058 A GB 445058A GB 445058 A GB445058 A GB 445058A GB 906633 A GB906633 A GB 906633A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- resistor
- capacitor
- relay
- pilot
- 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
- 239000003990 capacitor Substances 0.000 abstract 3
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details of starting control
- H02P1/04—Means for controlling progress of starting sequence in dependence upon time or upon current, speed, or other motor parameter
-
- 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
- H02H7/005—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 remote controlled apparatus; for lines connecting such apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
906,633. Protective arrangements. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Feb. 11, 1959 [Feb. 11, 1958], No. 4450/58. Class 38 (5). In a remote control system such as that described in Specification 700,472, a lamp 25, Fig. 1, is connected across a winding 19 of the pilot relay 3 and the circuit constants are such that when the control switch 6 is in its " start " or " run " position and no fault exists, the RMS voltage across the lamp due to the half wave current in the pilot circuit is insufficient for the lamp to glow. When an earth fault occurs on the pilot circuit, the rectifier 11 is short-circuited so that alternating current flows in the pilot circuit causing the relay to open and the increased RMS voltage across the lamp causes it to glow to indicate the presence of the fault. In another arrangement, Fig. 2, in which discrimination between half-wave and full conditions is provided by a capacitor 22 and a resistor 23 connected across the relay coil 21, the lamp 27 may be connected across the relay coil, across the capacitor or across the resistor, but not in series with the capacitor and resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB445058A GB906633A (en) | 1958-02-11 | 1958-02-11 | Improvements relating to electrical control systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB445058A GB906633A (en) | 1958-02-11 | 1958-02-11 | Improvements relating to electrical control systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB906633A true GB906633A (en) | 1962-09-26 |
Family
ID=9777420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB445058A Expired GB906633A (en) | 1958-02-11 | 1958-02-11 | Improvements relating to electrical control systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB906633A (en) |
-
1958
- 1958-02-11 GB GB445058A patent/GB906633A/en not_active Expired
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