Patent ID: 9728321
Date: 2017-08-08
CPC Classifications: H01F

Claim:
1. A transformer comprising: a number of windings each having a vertical cross-section, said windings are made of a foil tape having a length, said windings are wound by m layers coated with an interlayer insulation, wherein said m is an even positive number; said layers each is made of ferromagnetic metal; said windings each has—upper ends connected through a first yoke and—bottom ends connected through a second yoke; said windings each, in the vertical cross-section, is wrapped by a short-circuited coil; said windings each contains a transposition component for transposition of said layers, wherein the transposition component is inserted into a break provided in a middle of the length of said foil tape; a number of additional copper windings each wrapped around said windings; wherein: said insulation has an insulation thickness (d i ) determined according to a formula of: d i >u n2, pic */(E n2, pic ·m), where: u n2, pic is a conventionally predetermined maximum peak voltage between adjacent turns of said windings, E n2, pic is a conventionally predetermined maximum electric field strength of the insulation; and said insulation is made of ferroelectric material having a chemical formula of Fe 2 O 3 .