Technique for impregnating varnish of half packed 10KV grade high voltage coil

Abstract

The invention is a process for dip-painting a semi-enveloped 10KV-level high voltage coil and comprising the steps of: taking off the cover of a dip-painting tank, stably and vertically lifting the qualified coil into a lining tank, and putting on and fastening the cover; vacuumizing to 100 Pa below; transporting the dipping paint from a storage tank into the dip-painting tank; as vacuumizing to 600 Pa, closing the vacuumizing button; as pressurizing to 0.55 MPa, closing the pressurizing button; closing the vacuumizing button; as pressurizing to 0.55 MPa, closing the pressurizing button; closing the vacuumizing button; as pressurizing to 0.55 MPa, closing the pressurizing button; depressurizing to 0.2 MPa; opening and closing the paint transporting value; pushing the coil into an oven andwaiting until curing. The advantages: it can fill solvent-free insulating dipping paint in the SCRB10 semi- enveloped high voltage coil, so as to achieve the effect of low local discharge, even no local discharge.

Description

technical field [0001] The invention relates to a kind of SGRB10 (a national standard model of transformer) semi which can make the non-solvent insulating impregnating varnish fill the internal space of the semi-encapsulated high-voltage coil, so as to reduce the internal partial discharge of the coil, and even meet the requirement of no partial discharge. The special impregnation process for encapsulating 10KV high-voltage coils belongs to the technological neighborhood of high-voltage multi-layer cylindrical coil impregnation processes for transformers. Background technique [0002] At present, the high-voltage cake coils of SG10 dry-type transformers all adopt the vacuum pressure impregnation process, and the specific process steps are as follows: [0003] 1. Open the cover of the dipping tank, and lift the qualified coil into the lining tank smoothly and vertically. Cover and fasten the lid of the paint tank; 2. Turn on the vacuum pump to vacuum the paint tank; 3. Turn ...

AI Technical Summary

Problems solved by technology

However, since the SGRB10 semi-encapsulated 10KV high-voltage coil structure is a multi-layer cylindrical type, the number of layers of the coil is large, and the layers are filled with insulating materials, resulting in a relatively tight layer with a small air gap. If the impregnation process of the SGRB10 semi-encapsulated high-voltage coil is carried out according to the vacuum pressure impregnation process of the SGB10 dry-type transformer, the solvent-free insulating impregnating varnish will not be able to fill the air gap inside the SGRB10 semi-encapsulated high-voltage coil (through the test, impregnation The paint fills about 1 / 3 of the coil), which increases the partial discharge of the transformer (about hundreds of times the national standard)