Stationary induction apparatus
First Claim
1. A stationary induction apparatus comprising:
- a winding including a plurality of coil pieces; and
a plurality of electrostatic shield insulating layers surrounding said coil pieces, wherein each of said electrostatic shield insulating layers includes an electrical insulating layer, a first conductive layer on an inner surface of said electrical insulating layer, and a second conductive layer on an outside surface of said electrical insulating layer, at least a first of said coil pieces being surrounded by a first of said electrostatic shield insulating layers in a coil/shield combination, and a second of said coil pieces being surrounded by a second of said electrostatic shield insulating layers.
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Accused Products
Abstract
A stationary induction apparatus superior in insulating ability against a surge voltage includes a coil piece on a line end side surrounded by one electrostatic shield insulating layer. The coil piece and electrostatic shield insulating layer, together with another coil piece, are surrounded by another electrostatic shield insulating layer, thus forming a successively nested configuration. Each of the electrostatic shield insulating layers includes an electrical insulating layer of pressboard and first and second conductive layers respectively located on inner and outer surface sides of the electrical insulating layer, The capacitance of each of the electrostatic shield insulating layers is adjusted to control an electrical potential distribution upon application of a surge voltage.
11 Citations
14 Claims
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1. A stationary induction apparatus comprising:
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a winding including a plurality of coil pieces; and
a plurality of electrostatic shield insulating layers surrounding said coil pieces, wherein each of said electrostatic shield insulating layers includes an electrical insulating layer, a first conductive layer on an inner surface of said electrical insulating layer, and a second conductive layer on an outside surface of said electrical insulating layer, at least a first of said coil pieces being surrounded by a first of said electrostatic shield insulating layers in a coil/shield combination, and a second of said coil pieces being surrounded by a second of said electrostatic shield insulating layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification