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Thermal aging life evaluation method of generator stator bar insulation based on statistical test

A technology for generator stator and life evaluation, which is applied in design optimization/simulation, computer-aided design, calculation, etc., can solve problems such as validity doubts, and achieve the effective effect of thermal aging evaluation method

Pending Publication Date: 2018-12-21
SUZHOU UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

Therefore, although the existing research results have considerable theoretical and application value, their validity has been questioned to a certain extent.

Method used

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  • Thermal aging life evaluation method of generator stator bar insulation based on statistical test
  • Thermal aging life evaluation method of generator stator bar insulation based on statistical test
  • Thermal aging life evaluation method of generator stator bar insulation based on statistical test

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] This application discloses a method for evaluating the thermal aging life of the insulation of a generator stator bar based on statistical testing.

[0043] This method uses the Arrhenius equation to analyze and process the accelerated aging test data. When the Arrhenius equation is used to analyze and process the accelerated aging test data, it is considered that there are the following basic assumptions: 1) The aging failure time at the same temperature obeys the logarithm Normal distribution; 2) There is a linear correlation between the mathematical expectation of the lognormal distribution of the aging failure time and the test temperature; 3) The variance of the lognormal distribution of the aging failure time at different temperatures should have more significant variance homogeneity , the following are the specific steps:

[0044...

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Abstract

The invention discloses a method for evaluating insulation thermal aging life of generator stator bars based on statistical inspection, comprising the steps: on the basis of the traditional method forevaluating the thermal aging life, using probability theory and mathematical statistics methods such as distribution test, regression analysis and hypothesis test, variance analysis, the distributioncharacteristics of thermal aging data, the significance of regression equation, correlation coefficient and the applicability of thermal aging life model are verified, so that the thermal aging evaluation method of insulation bars is more effective.

Description

technical field [0001] The invention relates to a statistical test-based heat aging life evaluation method, in particular to a statistical test-based thermal aging life evaluation method for generator stator wire rod insulation. Background technique [0002] Generators are subjected to thermal, electrical, mechanical and other stresses for a long time during the operation process, resulting in aging, which reduces their operational reliability and service life. Domestic and foreign power plant users require that the service life of the turbogenerator be close to or reach 40 years. Compared with other components, the wire rod insulation, as an important part of the generator, has a short lifespan and is easily affected by aging. The short board of life. Statistics show that insulation causes more than 30% of generator failures. It can be seen that the state of the wire rod insulation is one of the key factors to determine the reliable operation or service life of the genera...

Claims

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Application Information

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IPC IPC(8): G06F17/50G01R31/12
CPCG01R31/12G06F30/20G06F2119/04Y04S10/50
Inventor 石颉
Owner SUZHOU UNIV OF SCI & TECH
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