Electrostatic shield for a transformer

摘要

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.