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Test equipment for AC withstand voltage test: a test to test the ability of electrical equipment insulation to withstand power frequency voltage. It is also used to test the ability of insulation to withstand operating overvoltage and temporary overvoltage for electrical equipment of 220kv and below. During the test, connect the tested product to the test loop according to the regulations, gradually increase the voltage to the rated power frequency withstand voltage value specified in the standard, keep it for 1 min, and then quickly and evenly reduce the voltage to zero. The test is considered to have passed the test if there is no breakdown or surface flashover in the insulation of the tested product. The voltage applied by the power frequency AC test is higher than the rated working voltage of the electrical equipment. Many insulation defects can be found through this test, especially for local defects. The AC withstand voltage test can be tested with a power frequency AC withstand voltage test device (also known as series resonance, variable frequency series resonance, series resonance device, series resonance withstand voltage test equipment, AC withstand voltage test device). Power frequency AC withstand voltage test device (also known as series resonance, variable frequency series resonance, series resonance device, series resonance withstand voltage test equipment, AC withstand voltage test device) is the latest generation of equipment specially used for capacitive test products AC withstand voltage test . The product is easy to operate, reliable in quality, small in size, light in weight, and very convenient for on-site use. The equipment can be used for 1. AC withstand voltage test of 6kV-500kV high-voltage cross-linked cables 2. AC withstand voltage test of generators 3. AC withstand voltage test of GIS and SF6 switches 4. Power frequency withstand voltage test of 6kV-500kV transformers 5. AC withstand voltage test of other power high-voltage equipment such as busbars, bushings, and transformers. The complete set of equipment consists of variable frequency power supply, excitation transformer, reactor and voltage divider. The switch has many kinds of air switches, more switches, less switches, SF6 switches, vacuum switches, etc.