The expert says, ac withstand voltage and dc withstand voltage are withstand voltage test, it is the commonly used method of insulation strength in testing electric power equipment. Insulation preventive test is an important measure to ensure the safe operation of the equipment. Through the test, the insulation status of the equipment can be mastered, the hidden defects in the insulation can be found in time, and timely preventive preparations can be made to avoid accidents.
Dc withstand voltage test
Dc withstand voltage test is high, it has special effect on finding some local defects of insulation, and can be carried out at the same time with leakage current test. Compared with AC voltage withstand test, dc voltage withstand test has the advantages of light test equipment, less damage to insulation and easy to find local defects of equipment. Compared with AC withstand voltage test, the main disadvantage of DC withstand voltage test is that the test of insulation is not as close to reality as ac withstand voltage test because of the different voltage distribution inside the insulation under AC and DC.
Ac withstand voltage test
Ac withstand voltage test is very strict on insulation, can effectively find more dangerous concentration defects. It is a direct method to identify the insulation strength of electrical equipment. It is of decisive significance to judge whether electrical equipment can be put into operation. It is also an important means to ensure the insulation level of equipment and avoid insulation accidents.
Ac voltage test may sometimes make some of the weaknesses in insulation more developed, so before the test must be tested on the insulation resistance, absorption ratio, leakage current and dielectric loss and other items, if the test results qualified can be carried out ac voltage test. Otherwise, it should be handled in time, and ac voltage test should be carried out after all indicators are qualified, so as not to cause undue insulation damage.
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