An insulation method for transition leads of stator windings in turbogenerators

Abstract

The invention discloses an insulation method of a transition lead wire of a stator winding in a steamer generator. The insulation method includes heating the outer surface of the insulation part of the transition lead wire to 70 DEG C, orderly cladding the insulation part with four mica insulating layers, and cladding the four mica insulating layers with a layer of thermal contraction band and three organosilicon epoxy resin layers in a half overlapped manner. The mica insulating layers successively include a solvent-free rubber layer, two half-overlapped clad mica band layers, two wide micafolium layers, and a solvent-free rubber layer from the inside to the outside, after each mica insulating layer is clad, the outer surface of the mica insulating layer is heated to 60-70 DEG C for 30 minutes, and then the insulation part is heated at a temperature of 90-100 DEG C, the insulation resistance value is measured once every 80-160 minutes, and the temperature can be cooled to the ambient temperature after the insulation resistance value is stable. The operation is simple, the workload of checking personnel is reduced, and the work efficiency is improved.

Description

technical field [0001] The invention relates to an air tightness and electric leakage detection method of a steam turbine. More specifically, the present invention relates to a method of insulating transition leads for stator windings in turbogenerators. Background technique [0002] The outlet of the stator winding of the transformer is generally led from the inside of the oil tank to the outside of the oil tank through the bushing to meet its current carrying and ground insulation requirements, and then connected to the busbar to realize the conversion and transmission of electric energy. [0003] When the voltage of the transformer is 110kV and above, the oil-paper capacitive bushing is mostly used. The winding outgoing cable passes through the thick-walled copper tube in the center of the bushing, and is connected to the terminal at the head of the bushing. The copper tube and the outgoing cable are at the same point in voltage. bits. [0004] The transition leads of t...

AI Technical Summary

Problems solved by technology

[0004] The transition leads of the stator winding passing through the bushing are usually made of multi-strand annealed copper cables, and the outer surface is half-folded with a white cloth tape. After the transfer and lead assembly in the preparation process, most of them are not tight and the insulation performance It is often not up to standard, so after the lead wire is assembled, the lead wire and the copper pipe are in close contact, because the insulation is not enough, the voltage breakdown strength is weak, causing the current to shunt, and the insulation life is also very short