Insulation of metallic surfaces in power transformers

Details Insulation of metallic surfaces in power transformers Insulation of metallic surfaces in power transformers

H - Electricity

01

F

336/47, 336/55,

H01F 27/34 (2006.01) H01F 27/36 (2006.01)

Patent

CA 1229667

- 11 - ABSTRACT OF THE DISCLOSURE A method for improving the electrical insulation of an electrode in a power transformer included in a converter plant of a high voltage direct current (HVDC) transmission system. The method involves winding around the electrode, layers of tape of woven or non-woven fibrous structure of non-conducting cellulose material, inorganic plastics material, or inorganic insulating material. This means that ions approaching the electrode, which are migrating under the influence of a high D.C. field outside the electrodes, do not sense the porous tape insulation as any noticeable obstacle, while at the same time the insulating layer is sufficiently dense to increase the breakdown value in the case of electrical surges.

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