GB529577A - Improvements in and relating to electric regulating systems - Google Patents
Improvements in and relating to electric regulating systemsInfo
- Publication number
- GB529577A GB529577A GB8447/39A GB844739A GB529577A GB 529577 A GB529577 A GB 529577A GB 8447/39 A GB8447/39 A GB 8447/39A GB 844739 A GB844739 A GB 844739A GB 529577 A GB529577 A GB 529577A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- valves
- resistance
- bias
- 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
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/28—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using discharge tubes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
529,577. Automatic control systems for dynamo - electric machines; converting. BRITISH THOMSON-HOUSTON CO., Ltd. March 16, 1939, No. 8447. Convention date, March 17, 1938. [Classes 38 (ii) and 38 (iv)] Voltage.-The field winding 3 of a synchronous machine 1 is supplied with D.C. from an A.C. circuit 15, to which the main winding 2 of the machine is also connected, through a rectifier comprising a transformer 14 and immersion-igniter valves 9-13. Control impulses for these valves are obtained from grid controlled valves 30 which receive lagging alternating control potentials from a transformer 41, the moment of ignition being determined by means of a variable-negative D.C. bias introduced in the circuit between the neutral point connections of the windings 43, 44 and the cathodes of the valves 9-13. This includes a constant bias across a resistance 79 supplied by a rectifier 75, and a bias across a resistance 48, supplied by a rectifier circuit 45, which varies in dependence on the potential of the circuit 15 and effects regulation of the main rectifier to adjust the potential of the machine 1 to constancy. An overriding control is provided by a bias across the resistance 86, which gives the machine 1 a drooping characteristic after a predetermined load has been reached. This is effected by means of an arrangement 80, comprising rectifiers 82-84 supplied from current transformers 81, which produces a potential proportional to the load current, which is applied, in opposition to a constant potential across a tapped portion of a resistance 88, to the resistance 86. To prevent the current through the winding 3 being reduced below a predetermined value, a circuit 103 is provided comprising valves 105 connected to shunt the resistances 48, 79 and 86 through a resistance 49 and which become conductive in response to a predetermined minimum voltage across the winding 3 to limit the amount of negative bias across these resistances. In the event of a sudden reduction of current the energy in the windings 3 discharges through the valves 8-13 which temporarily act as an inverter. An overriding biassing circuit 100 for limiting the maximum current through the field windings 3 is provided and is operated by a relay 94 in response to overload. A further overriding biassing circuit completed by a press button switch 116 is provided for use during starting. The valves 60 in the circuit 45 and the valves 105 in the circuit 103 are duplicated to avoid failure.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US529577XA | 1938-03-17 | 1938-03-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB529577A true GB529577A (en) | 1940-11-25 |
Family
ID=21981014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8447/39A Expired GB529577A (en) | 1938-03-17 | 1939-03-16 | Improvements in and relating to electric regulating systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB529577A (en) |
-
1939
- 1939-03-16 GB GB8447/39A patent/GB529577A/en not_active Expired
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