GB590379A - Means for the protection of electric motors against overloading - Google Patents
Means for the protection of electric motors against overloadingInfo
- Publication number
- GB590379A GB590379A GB6045A GB6045A GB590379A GB 590379 A GB590379 A GB 590379A GB 6045 A GB6045 A GB 6045A GB 6045 A GB6045 A GB 6045A GB 590379 A GB590379 A GB 590379A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- overload
- relay
- protection
- relays
- 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
Landscapes
- Protection Of Generators And Motors (AREA)
Abstract
590,379. Motor control systems; overload protection. SCHWARZ, B. Jan. 1, 1945, No. 60. [Class 38 (iii)] At least two current-operated overload relays are provided for the protection of a motor and are brought selectively into action in dependence on the speed of the motor by a tachometer generator or other electromagnetic device mechanically driven by the motor. In Fig. 2 the operating coil OC of a starter MS for an induction motor IM is controlled by thermal or other type overload relays RR and RS designed to protect the motor against overheating due to overload at or near full speed and at starting or low speed respectively. Switch CI shortcircuits the contacts of relay RR until the motor reaches 70 per cent. to 80 per cent. of full load when relay VR, responding to the EMF of generator TM driven by motor IM, closes switch C2 to short-circuit the contacts of relay RS and also opens switch CI. In Fig. 3 (not shown) the operating elements of relays RR and RS, fed by a current transformer, are selectively shortcircuited by switches C1 and C2.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB590379A true GB590379A (en) | 1947-07-16 |
Family
ID=1589880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6045A Expired GB590379A (en) | 1945-01-01 | Means for the protection of electric motors against overloading |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB590379A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2779343A3 (en) * | 2013-03-15 | 2014-11-05 | Rockwell Automation Technologies, Inc. | Multimotor variable frequency overload |
-
1945
- 1945-01-01 GB GB6045A patent/GB590379A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2779343A3 (en) * | 2013-03-15 | 2014-11-05 | Rockwell Automation Technologies, Inc. | Multimotor variable frequency overload |
| US9001476B2 (en) | 2013-03-15 | 2015-04-07 | Rockwell Automation Technologies, Inc. | Multimotor variable frequency overload |
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