Author: Noyafa–CCTV Tester
Question: What are the functions and selection methods of AC and DC withstand voltage testers? Answer: The AC and DC withstand voltage test is to expose a tested device to a very harsh electrical environment. If the product can be maintained in this harsh electrical environment, the problem: the role of the AC and DC withstand voltage tester and the What are the selection methods? Answer: The AC and DC withstand voltage test is to expose a tested device to a very harsh electrical environment. If the product can maintain normal conditions under this harsh electrical environment, it can be determined that it is in a normal environment. It must be able to maintain normal operation. Under normal circumstances, after product design, production, quality assurance and maintenance, a withstand voltage test is required to ensure that the product meets safety standards in all aspects. Different products have different technical specifications. Basically, the AC and DC withstand voltage test is to add a voltage higher than normal operation to the product to test, and this voltage must last for a specified period of time.
1. Selection of DC withstand voltage test equipment The test voltage required for the DC withstand voltage test is relatively high, which has a special effect on finding some local defects in the insulation, and 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 distribution 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 high voltage generator can be used for DC withstand voltage test, and digital microammeter can be used to monitor its leakage current while doing DC withstand voltage test. 2. Selection of AC withstand voltage test equipment The AC withstand voltage test is very strict on 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 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. Equipment selection: The intelligent AC withstand voltage test device and test transformer produced by Wuhan Hezhong Electric can be used for AC withstand voltage test. The intelligent dual-display insulation resistance tester can test the insulation resistance of the tested product, and can also measure the absorption ratio and polarization index, the dielectric loss of the tested product can be measured with an automatic anti-interference different frequency dielectric loss tester.
The AC and DC withstand voltage test is a very strict test for 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 process.
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