Q: What are the possible reasons for the insulation failure of power equipment in the withstand voltage test?

Answer: During the withstand voltage test, the possible reasons for the insulation failure of power equipment include:

(1) Insulation degradation. For example, moisture in transformer oil, moisture in solid insulation, insulation aging, etc. can all lead to a decrease in insulation performance and may fail the withstand voltage test.

(2) The testing method and voltage measurement method are incorrect. For example, during transformer testing, if the untested winding does not have a short circuit to ground, the untested winding may discharge to ground and be misjudged as unqualified. For example, when testing large capacity test objects, the voltage is still measured on the low voltage side. Due to the rising effect of capacitance, the actual voltage applied to the tested object exceeds the test voltage, causing the tested object to break down and be misjudged as unqualified.

(3) Without proper consideration of atmospheric conditions that affect insulation properties. Due to the influence of air pressure, temperature, and humidity on spark discharge voltage and breakdown voltage, if these factors are not considered, it may be concluded that the equipment is unqualified.

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