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Insulation performance testing method of electric power devices

A technology of insulation performance and test method, applied in the direction of testing dielectric strength, measuring device, measuring electrical variables, etc., can solve the problems of not being able to accurately and completely reflect the insulation characteristics of the test sample, lack of scientific rigor, etc.

Inactive Publication Date: 2012-09-19
刘志万
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Absorption ratio and polarization index are the ratio of insulation resistance at different specific times, which cannot accurately and completely reflect the insulation characteristics of the test object, and often lack scientific rigor

Method used

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  • Insulation performance testing method of electric power devices
  • Insulation performance testing method of electric power devices
  • Insulation performance testing method of electric power devices

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Experimental program
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Embodiment Construction

[0037] In the present embodiment, the electrical equipment insulation performance testing method is to carry out as follows:

[0038] Step 1. The DC test power supply in the high-voltage megohmmeter is used to apply a DC high voltage Es to the test product, and the high-voltage megohmmeter is used to calculate from the test start time t=0 to read the initial value t respectively 1 time, median t 2 time and final value t 3 The total current i of the sample corresponding to the moment 1 i 2 and i 3 ; select the initial value t 1 = 1 minute, median t 2 = 3.16 minutes, terminal value t 3 = 10 minutes. In principle, the time period of these three sampling points is located in the section where the current is stable and the amount of information is large.

[0039] Step 2. Calculate the leakage current i of the test product according to the regression classical statistical method c :

[0040] i c = ...

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Abstract

The invention discloses an insulation performance testing method of electric power devices. The insulation performance testing method is characterized by including: obtaining accurate enough dielectric insulation characteristic parameters through short time measuring value according to a mathematical statistic method, establishing a sample insulation test reference criterion according to an insulation dielectric absorption theory and an insulation equipment degradation mechanism, and judging insulation quality of samples comprehensively. The insulation performance testing method provides a novel thought and a rapid, practical and novel method for comprehensive analysis and evaluation of the insulation performance of the samples so as to expand capability to obtain insulation performance information of the samples, and predicts wide application prospects of insulation characteristic parameters and characteristic quantity as the insulation test reference criterion.

Description

technical field [0001] The invention relates to a method for testing the insulation performance of power equipment, more specifically, it is applied to the regular testing of high-voltage power equipment in power system operation, so as to prevent damage caused by the decline of insulation capacity. Background technique [0002] In the preventive insulation characteristic test and detection, the detection of the insulation resistance of power equipment is the most basic non-destructive test item, and the instrument used is usually a high-voltage megohmmeter. Only the test products that pass the insulation resistance test will be arranged for insulation performance tests such as leakage, dielectric loss, partial discharge, AC and DC withstand voltage tests, lightning and operating impulse voltage tests, etc., to avoid that the test products should not Some breakdown or damage, to ensure safe operation. [0003] Insulation resistance detection is simple, intuitive and efficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R27/14
Inventor 刘志万张杰宁
Owner 刘志万