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Method for quickly estimating electrical life of stator bar of high-voltage motor

A technology for stator bar and high-voltage motor, which is applied in the direction of measuring electricity, measuring electrical variables, and testing dielectric strength, etc., can solve the problems of inability to estimate the life of the instantaneous breakdown test, high test cost, and long test time.

Active Publication Date: 2020-10-23
HARBIN ELECTRIC MASCH CO LTD
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AI Technical Summary

Problems solved by technology

This traditional method of extrapolating insulation life requires a long test time and high test cost
At the same time, this method cannot obtain the distribution state of the insulation life of the stator bar, nor can it predict the life of the instantaneous breakdown test, so it has certain limitations

Method used

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  • Method for quickly estimating electrical life of stator bar of high-voltage motor
  • Method for quickly estimating electrical life of stator bar of high-voltage motor
  • Method for quickly estimating electrical life of stator bar of high-voltage motor

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Embodiment Construction

[0023] A method for quickly estimating the electrical life of a stator bar of a high-voltage motor, comprising the following steps:

[0024] 1) Make 20 pieces of high-voltage motor stator bars, divide them into two groups, 10 pieces in each group, use a high-voltage test transformer under the condition of 15°C to 25°C, and conduct tests in transformer oil. The first group is tested at a constant voltage of 3U N electrical aging test, where U N is the rated voltage of the stator bar, the second group conducts an instantaneous breakdown test with a constant boost speed of 1kV / s until all the stator bars are completely broken down;

[0025] 2) According to the test results, the electrical aging test breakdown time (1) of the first group of 10 stator bars is obtained, and the instantaneous breakdown test breakdown time (2) of the second group of 10 stator bars is obtained;

[0026] 3) if figure 1 As shown in , the t and P corresponding to the 10 breakdown points (1) of the first...

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Abstract

The invention discloses a method for quickly estimating the electrical life of a stator bar of a high-voltage motor. Based on an electrical aging test of a group of stator bars and an instantaneous breakdown test of a group of stator bars, the Weibull distribution states and breakdown time of the other stator bars for electrical aging tests and instantaneous breakdown tests can be quickly estimated by drawing on a Weibull distribution failure probability graph according to the relationship of Weibull parameters under different tests. The method has the advantages of being simple, clear in process, rapid in analysis and wide in applicability; and under the condition that the electrical service life of the stator bar is rapidly and accurately estimated, the estimation cost of the service life of the stator bar can be greatly reduced, the insulation design of the stator bar is effectively improved, and the insulation performance of the stator bar is improved.

Description

technical field [0001] The invention relates to a method for quickly estimating the electrical life of a stator bar of a high-voltage motor. Background technique [0002] The stator bar is the core component of the high-voltage motor. During the test and operation, it bears the combined effects of various stresses such as electrical stress and thermal stress. Its reliability and life play a decisive role in the stable operation of the unit. The insulation life of the stator bar determines the life of the stator winding of the generator. Rapid and accurate prediction of the electrical insulation life and distribution of the stator bar plays a very important role in guiding the insulation design and optimization of the stator bar. [0003] In the estimation of the insulation life of the stator bar, two or more sets of electrical aging test data are usually used to obtain the insulation life of the stator bar at other voltages through the method of negative power linear extrapo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1227
Inventor 孙永鑫范寿孝冯超王润鹏白洁孙铎
Owner HARBIN ELECTRIC MASCH CO LTD
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