GB284751A - Improvements in electric machines and apparatus - Google Patents
Improvements in electric machines and apparatusInfo
- Publication number
- GB284751A GB284751A GB2731526A GB2731526A GB284751A GB 284751 A GB284751 A GB 284751A GB 2731526 A GB2731526 A GB 2731526A GB 2731526 A GB2731526 A GB 2731526A GB 284751 A GB284751 A GB 284751A
- Authority
- GB
- United Kingdom
- Prior art keywords
- windings
- insulation
- conducting
- coating
- coated
- 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
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
284,751. English Electric Co., Ltd., and Youngmark, F. A. Nov. 1, 1926. Coils and conductors; insulation. - The insulated high-tension windings of electrical machines and apparatus, such as the projecting coil-ends in a dynamo, are provided with a conducting or semi-conducting covering in intimate contact with and continuous over the surface of the insulation and connected to earth or other point of low potential in order to limit the potential difference which can exist between the surface and adjacent bodies. The air adjoining the windings is thereby kept practically free from electrical stress and brush discharges from the insulated surfaces of the windings are minimized. The covering may be applied to the surface of the insulating material before or after it is wrapped over the whole surface of the windings or locally, for instance where the two phases of an alternator winding cross each other or lie side by side. It may consist of a thin coating of carbon, such as floccular graphite in the form known under the registered Trade-mark " Aquadag " or powdered graphite mixed to a cream with benzine, painted on and polished with a brush before it completely dries. Or paper or tape soaked in a suspension of carbon in a liquid, such as Indian ink, may be employed. Alternatively, metal may be used in the form of foil on a graphite layer on the surface of the insulation or sprayed on to it by the Schoop process. In the case of slot-wound machines, form-wound coils may be coated during manufacture and inserted in slot liners which are similarly coated internally and externally so as to give an earth connection via the machine core. Leatheroid liners coated with " Aquadag " may be used for this purpose. The conducting surface may be covered with an additional coating, insulating or otherwise, for mechanical protection and the prevention of leakage across upstanding fibres or particles. Paint or varnish, with or without taping, may be used for this coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2731526A GB284751A (en) | 1926-11-01 | 1926-11-01 | Improvements in electric machines and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2731526A GB284751A (en) | 1926-11-01 | 1926-11-01 | Improvements in electric machines and apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB284751A true GB284751A (en) | 1928-02-01 |
Family
ID=10257574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2731526A Expired GB284751A (en) | 1926-11-01 | 1926-11-01 | Improvements in electric machines and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB284751A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2582018A1 (en) * | 2011-10-14 | 2013-04-17 | Siemens Aktiengesellschaft | Stator of an electric machine with integrated outer corona protection |
-
1926
- 1926-11-01 GB GB2731526A patent/GB284751A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2582018A1 (en) * | 2011-10-14 | 2013-04-17 | Siemens Aktiengesellschaft | Stator of an electric machine with integrated outer corona protection |
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