Electrostatic shield for a transformer
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMinoru Kimura, Teruo Ina
Life of this patent
Estimating the term…
Abstract
An electrostatic shield for an electrical transformer comprises a substantially ring-shaped inner insulator of asymmetric vertical cross-section with a side confronting a coil of the transformer being substantially planar and the remaining surface being of a curved section, a field concentration relaxation conductor formed from a conductive foil, completely surrounding the inner insulator, and a multiple outer insulator comprising at least one layer of polyethylene terephthalate (PET) film and at least one mica insulation layer with mica bonded to a non-conductive backing film such as glass tape or PET film by a bonding agent such as epoxy resin, whereby the dielectric strength of the electrostatic shield and hence the transformer, is substantially improved.
Claims6
An electrostatic field for an electrical transformer coil comprising a substantially ring shaped inner insulator, a field concentration relaxation conductor formed by winding a conductive foil into a sheet forming a layer completely surrounding the inner insulator, and a multiple outer insulation layer surrounding the field concentration relaxation conductor, said multiple outer insulation layer comprising at least one layer of polyethylene terephthalate film and at least one mica insulation layer.
Dependencies are inferred from the claim text.