Brief Introduction Of Withstand Voltage Tester

Hipot tester, also known as electrical insulation strength tester, or dielectric strength tester, is also called dielectric breakdown device, dielectric strength tester, high voltage tester, high voltage breakdown device, withstand voltage tester, etc. A test in which a specified AC or DC high voltage is applied between the live part and the non-live part (usually the shell) of the electrical appliance to check the withstand voltage capability of the insulating material of the electrical appliance. In the long-term operation of electrical appliances, they must not only withstand the rated working voltage, but also withstand the short-term overvoltage that is higher than the rated working voltage during operation (the overvoltage value may be several times higher than the rated working voltage value) . Under the action of these voltages, the internal structure of the electrical insulating material will change. When the overvoltage intensity reaches a certain value, the insulation of the material will break down, the electrical appliances will not operate normally, and the operator may get an electric shock, endangering personal safety. The main test indicators of electrical safety include AC/DC withstand voltage, insulation resistance, leakage current, grounding resistance, etc. The AC/DC withstand voltage test is used to test the electrical safety performance of the product under actual working conditions, and is one of the important indicators for testing the electrical safety performance of the equipment. The withstand voltage testers currently on the market adopt the GB4706 (equivalent to IEC1010) standard, and most of them are single-item test index test instruments with a desktop structure, which cannot meet the needs of users for multi-index comprehensive testing; Most of the testers use the traditional test method, the test accuracy is not high, and the technology and main performance indicators used are far behind the advanced level of foreign countries, which cannot fully meet the needs of the current development of electrical safety performance testing. Therefore, it is of great significance to study the withstand voltage test system that adopts advanced technology and has better performance indicators in line with the latest international standards.
The withstand voltage tester is mainly used for the withstand voltage test of polyethylene insulated power cables, and can also be used for the insulation withstand voltage test of large power transformers. It is a new method to test the withstand voltage of power cables by ultra-low frequency high voltage tester.