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A process method for preventing false breakdown of wire rods when stator windings of large motors withstand AC voltage

A stator winding and AC withstand voltage technology, which is applied in the direction of motor generator testing, measuring electricity, and measuring electrical variables, etc., can solve the problems of delay in instantaneous overvoltage impact, improper protection of overvoltage protection, and false breakdown of wire rods. Achieve the effects of reducing scattered voltage, uniform potential gradient distribution, and improving accuracy

Active Publication Date: 2021-07-13
HARBIN ELECTRIC MASCH CO LTD
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In addition, the overvoltage protection of the test equipment is not properly protected, and the overvoltage protection action is delayed compared with the instantaneous overvoltage impact generated by the inductance coil, which eventually leads to the overvoltage of the straight line angle insulation part of the qualified wire rod during the AC withstand voltage test. Phenomenon of false breakdown of voltage to ground
[0003] Therefore, in order to solve the above situation, it is necessary to propose an easy-to-promote, universal, low-cost, and effective method for preventing wire rods from being broken down in the AC withstand voltage test of large-scale motor stator windings. The process of being broken down by mistake during the withstand voltage test

Method used

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  • A process method for preventing false breakdown of wire rods when stator windings of large motors withstand AC voltage
  • A process method for preventing false breakdown of wire rods when stator windings of large motors withstand AC voltage
  • A process method for preventing false breakdown of wire rods when stator windings of large motors withstand AC voltage

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Embodiment Construction

[0026] The purpose of the present invention is to provide a process method for preventing false breakdown of wire bars when the stator winding of a large motor is withstand voltage. The implementation of the present invention comprises the following process steps:

[0027] 1) Removal of pollutants at the end of the stator winding: such as figure 1 As shown, clean the part of the stator winding end 1 that is stained with low-resistance epoxy polyester semi-conductive paint. After the thicker part of the paint film is gently scraped off with a blade, wipe the part with white cotton cloth and industrial anhydrous alcohol Clean and expose the original insulation color. Low-resistance epoxy polyester semi-conductive varnish penetrates into 2 of the straps and needs to be replaced with new straps 2 and re-bound. Strictly prevent the presence of low-resistance epoxy polyester semi-conductive varnish at the end of the stator winding. The phenomenon;

[0028] 2) Grinding of the strap...

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Abstract

The invention discloses a process method for preventing false breakdown of wire rods when the stator winding of a large motor is AC withstand voltage. The surface potential gradient of the iron block at the end and the end hoop bracket is evenly distributed, which effectively controls the generation of weak arc discharge caused by the scattered voltage of the iron block at the end of the winding and the end hoop bracket. The present invention adopts correct and effective overvoltage protection measures to prevent wire rods from being accidentally broken down by overvoltage during the AC withstand voltage test, reduce the loss cost of product manufacturing, ensure the installation quality and progress, and restore the authenticity of the test. , which improves the accuracy of the test. The invention is a novel technical scheme with strong practicability, simple and convenient operation and easy popularization.

Description

Technical field: [0001] The invention relates to a process method for preventing false breakdown of a wire rod when a stator winding of a large motor is subjected to an AC withstand voltage. : Background technique: [0002] The AC withstand voltage test of large motor stator windings is an essential and important inspection and test item in the installation process of large motor stator windings. This test is to check whether the wire rod is damaged during the installation process and people cannot find it through the naked eye inspection. The inspection test method of electrical assessment is adopted. With the production and manufacture of large motors, the rated voltage level of the motors increases, and the test voltage value of the AC withstand voltage test of the stator windings is also continuously increased. The installation of the stator winding of a large motor has to go through four AC withstand voltage tests, which are the AC withstand voltage preventive test be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K15/10G01R31/12G01R31/34
CPCG01R31/1263G01R31/346
Inventor 王文天王文彪李伟刚王崇光王景王天烁王照森袁外明靳颖李英凯
Owner HARBIN ELECTRIC MASCH CO LTD
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