Insulation damage rapid recovery method of variable-frequency high-voltage motor winding

Abstract

The invention discloses an insulation damage rapid recovery method of a variable-frequency high-voltage motor winding. The method comprises the steps of firstly, finding an insulation damage positionof a copper wire of the motor winding, removing a slot wedge and a cushion strip above the damage position, and exposing the motor winding; stripping an anti-corona layer and insulation layers right above a fault point, and reserving the main insulation layers at two sides of the fault point as much as possible; sequentially cutting off the copper wire and upwards turning up the copper wire from an end part of the winding at the fault point from top to bottom, exposing the insulation damage point position, and removing the damage point insulation layer and carbide impurity; employing insulation paper to bind turns of the motor winding, welding the cutoff copper wire, pouring epoxy resin and mica powder in a proportion being 6:1, scraping residual epoxy resin, and waiting for curing; assembling the motor winding after the epoxy resin is cured, and completing rapid recovery of insulation damage. By the method, the winding is not needed to be replaced, insulation replacement is only performed on the insulation damage position, the recovery period and the recovery cost are effectively reduced, and the demand of urgent need for production recovery in a site is satisfied.

Description

technical field [0001] The invention relates to a quick repair method for insulation damage of a variable frequency high voltage motor winding. Background technique [0002] The insulation of the motor winding is the key to the normal operation of the motor. Usually, if the insulation is damaged, only the winding can be replaced, usually all the windings are replaced (overhaul) and partial replacement (minor repair); [0003] The winding overhaul is to rewind and replace all the motor windings according to the insulation specifications. This method is suitable for the situation where the motor windings are seriously damaged and the scope is wide. However, the repair period is generally 1 to 2 months, and the labor and material consumption is large. For example, a 900KW / 6KV motor winding overhaul requires 500Kg of magnet wire. Based on the unit price of double-wave double imide magnet wire at 88 yuan / Kg, the optical magnet wire alone costs 44,000 yuan. [0004] Minor windin...

AI Technical Summary

Problems solved by technology

[0005] The above two repair methods have a long period, and it is difficult to meet the urgent need to resume production on site