Dry type transformer and manufacturing method thereof

Abstract

The invention belongs to the field of a transformer device, in particular to the improvement technology of the dry type transformer. The invention discloses a manufacturing method for the dry type transformer. processing a lead wire, an insulating tube and an insulating end ring by an NOMEX paper with insulated paint or glass cloth, and then winding them into a transformer; the manufacturing method is simple for processing, is convenient for the operation of work personnel and can effectively prevent dust from being cohered on the surface of the coil; respective to the productive technology of the existing vacuum pressure dipping paint, bigger device and area investment can be saved, thus reducing the pollution on the production environment and the influence of the insulating paint dropping on the production occasions in the carrying process; in addition, a pressure vessel is not needed in the production process; the safety loophole of the devices does not exist; and multiple-heating baking is saved in the production process, thus saving a mass of energy.

Description

technical field [0001] The invention belongs to the field of transformer equipment, and in particular relates to an improvement technology of a dry-type transformer. Background technique [0002] At present, the known insulation treatment process of impregnated dry-type transformer coils is vacuum pressure impregnation (commonly known as VPI process) using solvent-free resin varnish. The process is as follows: compress the wound coil with a compression tool, place it in an oven, raise the temperature to 120°C, keep it warm for 4 hours, take out the coil, cool it to 100°C naturally, wash the coil with dry air, and then use silicon Grease (silicone oil) to smear the leading thread, continue to cool to 40-60 ℃ for later use; open the paint storage tank to stir, and gradually vacuum the paint storage tank to 0.08Mpa (normal atmospheric pressure), keep the vacuum for 0.5 hours, stop stirring, and release the vacuum; Lift the preheated and cleaned coil into the opened paint dippi...

AI Technical Summary

Problems solved by technology

The process takes about 40 hours and is inefficient; the investment in dipping equipment is about 400,000 yuan, the investment in equipment installation is about 100,000 yuan, and the investment in resin paint is about 250,000 yuan, which takes up a lot of funds; the required site area is 120m2, which takes up production The site is large; when the coil is dipped in paint and enters the drying room, the resin paint drips on the ground, which affects the sanitation of the production site; the volatile matter of the resin paint is mainly styrene,