GB796509A - Improvements relating to the protection of ward-leonard generators - Google Patents
Improvements relating to the protection of ward-leonard generatorsInfo
- Publication number
- GB796509A GB796509A GB26748/55A GB2674855A GB796509A GB 796509 A GB796509 A GB 796509A GB 26748/55 A GB26748/55 A GB 26748/55A GB 2674855 A GB2674855 A GB 2674855A GB 796509 A GB796509 A GB 796509A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- contacts
- speed
- generator
- voltage
- 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
- H02H7/06—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 generators; for synchronous capacitors
-
- 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
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/34—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using Ward-Leonard arrangements
- H02P7/347—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using Ward-Leonard arrangements in which only the generator field is controlled
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
796,509. Automatic speed control systems. BRITISH THOMSON-HOUSTON CO., Ltd. Sept. 18, 1956 [Sept. 19, 1955], No. 26748/55. Class 38 (4). In a speed controlled Ward Leonard system wherein the voltage of the generator 1 is compared with an adjustable reference voltage 6 in a mixer 8 and used to control the excitation 4 of the generator, a relay 11 is shunted across resistor 5, which is the source of the fed-back voltage, so as to be responsive to a predetermined low value, and has its contacts 17 connected in a protective circuit including a reference supply interrupting relay 15 and the contacts 18 of a relay 19 responsive to the speed of the motor as indicated by a tachometer generator 20. Contacts 17 are normally opened and the contacts 18 of relay 19 are arranged to close at or above 50 per cent full speed. An alternative relay arrangement in which relay 15 is normally operated to connect the reference voltage, and normally closed no volt relay contacts are in parallel with normally open speed relay contacts in the protective relay path, is described with reference to Fig. 2 (not shown).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB26748/55A GB796509A (en) | 1955-09-19 | 1955-09-19 | Improvements relating to the protection of ward-leonard generators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB26748/55A GB796509A (en) | 1955-09-19 | 1955-09-19 | Improvements relating to the protection of ward-leonard generators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB796509A true GB796509A (en) | 1958-06-11 |
Family
ID=10248609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26748/55A Expired GB796509A (en) | 1955-09-19 | 1955-09-19 | Improvements relating to the protection of ward-leonard generators |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB796509A (en) |
-
1955
- 1955-09-19 GB GB26748/55A patent/GB796509A/en not_active Expired
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