The function and selection method of AC and DC withstand voltage test equipment

AC and DC withstand voltage test is to expose a tested equipment to a very harsh electrical environment. If the product can maintain normal conditions under such harsh electrical environment, it can be determined that it is also in a normal environment. It must be able to maintain normal operating conditions. Under normal circumstances, after product design, production, quality assurance and maintenance, it is necessary to do a withstand voltage test to ensure that the product meets the safety standards in all aspects. Different products have different technical specifications. The AC and DC withstand voltage test is basically a test by applying a voltage higher than the normal working voltage to the product. This voltage must last for a specified period of time.

1. Selection of DC withstand voltage test equipment

The DC withstand voltage test requires a higher test voltage, which has a special effect on the discovery of some local defects in the insulation, and it can also 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 advantages 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 distributions inside the insulation under AC and DC, the DC withstand voltage test is not as close to the actual test requirements as the AC withstand voltage test.

Equipment selection: DC Hipot Tester, DC high voltage generator produced by Wuhan EP Hipot Electric can be used for DC withstand voltage test. While doing DC withstand voltage test, a digital microammeter can be used to monitor its leakage current.



2. Selection of AC withstand voltage test equipment

The AC withstand voltage test is very strict to the insulation test, and can effectively find the more dangerous concentrated defects. It is the most direct 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 weaknesses in the insulation more developed. Therefore, the test product must be tested for insulation resistance, absorption ratio, leakage current, and dielectric loss before the test. If the test result is qualified, the AC can be tested. Pressure test. Otherwise, it should be dealt with in time, and the AC withstand voltage test should be carried out after the various indicators are qualified, so as to avoid undue insulation damage.

Equipment selection: The power frequency withstand voltage test device DC AC Hipot Test Set and testing transformer produced by EP Hipot Electric can be used for AC withstand voltage test. The insulation resistance tester can measure the insulation resistance of the tested product, as well as the absorption ratio and polarization. Index, the dielectric loss of the tested product can be measured with the automatic anti-interference different frequency dielectric loss tester.

The DC AC withstand voltage test is a very strict test on the insulation withstand voltage performance of the tested product. After the AC and DC withstand voltage test, the possible defects and safety hazards of the tested product can be found during the test.