Non-destructive test results of electrical equipment insulation, comprehensive analysis and judgment method - Database & Sql Blog Articles

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After a series of non-destructive tests on electrical equipment insulation, a preliminary comprehensive analysis of the test results should be carried out, usually from the following three aspects.

1) Compare the test results with the insulation resistance values ​​required in the handover standard or the preventive test procedure. If the test value is within the range required by the Standard or the Code, it is generally considered qualified, otherwise it needs further inspection.

2) Compared with the previous test results of the equipment, there should be no obvious difference. Otherwise, further inspection should be carried out, especially the change of the dielectric loss tangent value, which is often more accurate and effective for judging insulation defects.

3) Compared with similar equipment or the same equipment, if the insulation is good, the values ​​between them are relatively close, otherwise the insulation may be considered to have problems. Since the conditions of temperature, humidity, and dirt have a significant influence on the value of the insulation parameter, the influence of these factors should be excluded when analyzing and judging the test results, especially the temperature influence of the insulator (such as general insulation, usually temperature). For every 10 °C drop, the insulation resistance is increased by a factor of 2.) Therefore, the measured insulation resistance, DC leakage current, and tg value should be compared to the same temperature for comparison.