Production and pouring method of dry type transformer coil

Abstract

The invention discloses a production and pouring method of a dry type transformer coil. According to the invention, the inner surface of a mold cavity of a pouring mold is coated with rare metal, and the proportion of a pouring material is adjusted; the pouring material comprises epoxy resin and a curing agent at the weight ratio of (1:3) to (2:3); the pouring technological parameters are improved; the flowability of the pouring material is increased in pouring; the poured coil is bright and has no pore without being polished and painted; meanwhile the local discharge quantity is far less than that of the national standard.

Description

technical field [0001] The invention belongs to the technical field of dry-type transformer manufacturing technology, and relates to a casting technology for dry-type transformer coils, in particular to a production casting method for dry-type transformer coils. Background technique [0002] Transformer coils play a vital role in the reliability of transformer operation. In order to meet the needs of modern society, improve the withstand voltage and insulation of transformer coils, meet high-tech product requirements, and ensure product quality. It is difficult to guarantee product quality and appearance when casting transformer coils, and there are problems such as withstand voltage, low insulation, local leakage, and small application range; the traditional epoxy casting process of dry-type transformer coils generally uses epoxy in the casting material Resin and curing agent are mixed according to the ratio of 1:1 to cast the coil. Although there are some differences in th...

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Problems solved by technology

[0002] Transformer coils play a vital role in the reliability of transformer operation. In order to meet the needs of modern society, improve the withstand voltage and insulation of transformer coils, meet high-tech product requirements, and ensure product quality. It is difficult to guarantee product quality and appearance when casting transformer coils, and there are problems such as withstand voltage, low insulation, local leakage, and small application range; the traditional epoxy casting process of dry-type transformer coils generally uses epoxy in the casting material Resin and curing agent are mixed according to the ratio of 1:1 to cast the coil. Although there are some differences in the process parameters in the casting process during production, the processing quality of the dry-type transformer coil produced by the traditional process is often not guaranteed. The surface has pores and is not bright, so more grinding, repairing, and painting processes are required. However, as the working time increases, the paint will be oxidized and peeled off, which will affect the quality of the coil surface, thereby affecting product quality and partial discharge.