Both AC withstand voltage and DC withstand voltage are withstand voltage tests, and both are common methods for testing the dielectric strength of power equipment. Insulation preventive test is an important measure to ensure the safe operation of equipment. Through the test, we can master the insulation status of the equipment, discover the hidden defects in the insulation in time, and make preparations for timely prevention.
DC withstand voltage test
The DC withstand voltage test has a high voltage, which has a special effect on finding some local defects in the insulation, and can be carried out at the same time as the leakage current test. Compared with the AC withstand voltage test, the DC withstand voltage test has the characteristics of light test equipment, less damage to the insulation and easy to find local defects of the equipment. Compared with the AC withstand voltage test, the main disadvantage of the DC withstand voltage test is that due to the different voltage distribution inside the insulation under AC and DC, the DC withstand voltage test is not as close to the reality as the AC withstand voltage test.
AC withstand voltage test
The AC withstand voltage test is very strict on the insulation test, and can effectively find the more dangerous concentrated defects. It is a direct and effective method to identify the insulation strength of electrical equipment. It is of decisive significance for judging whether the electrical equipment can be put into operation. It is also an important means to ensure the insulation level of the equipment and avoid insulation accidents.
The AC withstand voltage test may sometimes make some weak points in the insulation further developed. Therefore, the test items must be tested for insulation resistance, absorption ratio, leakage current and dielectric loss before the test. If the test results are qualified, the AC withstand voltage test can be carried out. pressure test. Otherwise, it should be dealt with in time, and the AC withstand voltage test should be carried out after each index is qualified, so as to avoid unnecessary insulation damage.