AC / DC withstand voltage test is to expose a tested equipment to a very harsh electrical environment. If the product can maintain normal condition in this harsh electrical environment, it can be determined that it can also maintain normal operation in normal environment. In general, after product design, production, quality assurance and maintenance, pressure test is needed to ensure that the product meets the safety standards in all aspects. Different products have different technical specifications. AC / DC withstand voltage test is basically to test the products with a voltage higher than the normal working voltage, which must last for a specified period of time.
1. Selection of DC withstand voltage test equipment
The DC withstand voltage test needs a higher test voltage, which has a special effect on finding some local defects of insulation. It can also be carried out simultaneously with the leakage current test.
Compared with AC withstand voltage test, DC withstand voltage test has the advantages of light test equipment, less insulation damage and easy to find local defects. Compared with AC voltage withstand test, the main disadvantage of DC voltage withstand test is that due to the different voltage distribution in the insulation under AC and DC, the test of DC voltage withstand test is closer to the actual test requirements than AC voltage withstand test.
Equipment selection: the DC high voltage generator produced by Wuhan Zhuo electric power company can be used for DC withstand voltage test, and the leakage current can be monitored by digital micro ammeter at the same time.
2. Selection of AC withstand voltage test equipment
AC withstand voltage test is very strict for insulation, which can effectively find more dangerous concentrated defects. It is the most direct method to identify the insulation strength of electrical equipment, which is of decisive significance to judge whether electrical equipment can be put into operation, and it is also an important means to ensure the insulation level of equipment and avoid insulation accidents.
AC withstand voltage test sometimes may make some weakness of insulation more developed, so it is necessary to test the insulation resistance, absorption ratio, leakage current, dielectric loss and other items before the test. If the test results are qualified, AC withstand voltage test can be carried out. Otherwise, it should be dealt with in time, and AC withstand voltage test should be conducted after all indexes are qualified, so as to avoid unnecessary insulation damage.
Equipment selection: the intelligent AC withstand voltage test device and test transformer produced by Wuhan Huizhuo electric power company can be used for AC withstand voltage test. The insulation resistance of the tested object can be measured by the intelligent double display insulation resistance tester. Meanwhile, the absorption ratio and polarization index can be measured. The dielectric loss of the tested object can be measured by the automatic anti-interference different frequency dielectric loss tester.
AC / DC withstand voltage test is a very strict test on the insulation and withstand voltage performance of the tested object. Through the AC / DC withstand voltage test, the possible defects and potential safety hazards of the tested object can be found in the test process.
Post time: Jun-13-2021
