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Method for repairing inter-phase corona condition of stator windings

A stator winding and repair method technology, applied in the shape/style/structure of winding insulation, winding insulation materials, electrical components, etc., can solve the problem of harsh operating environment of stator winding, difficult disassembly and repair of stator winding, and difficulty in repairing stator winding, etc. problem, achieve the effect of reducing the amount of winding corona discharge, increasing the level of corona inception voltage, and reducing the effect of corona discharge

Pending Publication Date: 2021-12-10
HARBIN ELECTRIC MASCH CO LTD
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Problems solved by technology

[0004] At the same time, due to the harsh operating environment of the stator winding, which is in a high electrical, thermal and mechanical stress environment, it is difficult to disassemble and repair the stator winding after installation, which leads to the repair of problems such as corona in the stator winding difficulty

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  • Method for repairing inter-phase corona condition of stator windings

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Embodiment Construction

[0022] The application will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present application.

[0023] The present invention is a kind of method for repairing the phase-to-phase corona condition of stator windings, comprising the following steps:

[0024] Step 1: The repair material for the corona between the phases of the stator winding, including two-component room temperature solvent-free brushing glue, 250 mesh quartz powder, 95% industrial alcohol and epoxy ester drying red enamel paint, two-component room temperature solvent-free brushing The initial mixed viscosity of the glue (25°C) is 500-800mPa·s, the pot life is ≥30min, the curing time is ≤24h, the dielectric strength is ≥20kV / mm, the drying time of the epoxy ester red enamel paint film is ≤24h, and the dielectric strength is ≤24h....

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Abstract

The invention discloses a method for repairing inter-phase corona condition of stator windings. According to the method, the position of the stator winding interphase insulation cushion block is accurately repaired in a mode of mixing the room-temperature brushing glue and the filler, the winding interphase insulation shape can be effectively improved, and the corona onset voltage level of the stator winding is improved. The equipment has the advantages of being simple in structure, convenient in process, rapid in repair and remarkable in effect, the corona discharge condition near the stator winding interphase insulation cushion block can be effectively eliminated, corrosion of the corona discharge to main insulation of a stator bar is avoided, the electrical performance stability of the stator winding is improved, and the service life of the stator winding is prolonged.

Description

technical field [0001] The invention relates to the field of high-voltage motors, in particular to a method for repairing the phase-to-phase corona of stator windings. Background technique [0002] Corona discharge between phases of stator windings of high-voltage motors is a relatively common corona problem during testing and operation. Long-term corona discharge will continuously corrode the stator windings, and in severe cases, it will cause winding short-circuit accidents. Therefore, repairing the corona discharge of the stator windings plays an important role in the stable operation of the stator windings of high-voltage motors. [0003] The insulation structure at the end of the stator winding is relatively complex, and there are supporting insulation structures such as pads, binding ropes and end hoops. At the junction of different insulation structures, due to the influence of the insulation structure, material properties and the shape of the external air gap, it is...

Claims

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Application Information

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IPC IPC(8): H02K15/10H02K15/00H02K3/30H02K3/40
CPCH02K15/105H02K15/0006H02K3/30H02K3/40
Inventor 孙永鑫范寿孝满宇光魏丽华索春英
Owner HARBIN ELECTRIC MASCH CO LTD
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