STATIONARY INDUCTION ELECTRIC APPARATUS

摘要

PURPOSE: To improve the inter-coil dielectric strength of a winding. CONSTITUTION: The arranging positions of inter-coil spacers 12 which are used for insulating a stationary induction electric apparatus and as insulators constituting the cooling passage of an insulating medium are deviated from the positions of linear spacers 13 and an inter-coil cooling passage is constituted so that each spacer 12 constituted in a two-layer structure composed of thermosetting rubber and high-density aramid board can wrap disk coils. In addition, each linear spacer 13 is constituted in a two layer structure of a high-density aramid board and rubber board containing fibers as a base material so that the spacer 13 can have a cushioning property and the rubber can fill up minor gaps when the rubber is softened by heating and can be hardened to a fixed shape when the rubber is hardened after heating. The winding of the stationary induction electric apparatus is formed by applying the above-mentioned structure to the 0.7-1.0 range of the inter-coil electric field ratio of the part of the winding which becomes a strong electric field.