By hvhipot 
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Firstly, let me explain what the withstand voltage test is. The insulation level of the equipment is not the rated working voltage on the equipment nameplate, but is characterized by the standard value of the test voltage applied during the withstand voltage test. And this test voltage is determined based on the highest internal and external overvoltages that electrical equipment may encounter in actual operation, as well as the effects of long-term operating voltage. In order to test the reliability of insulation operation of electrical equipment, the test conducted according to the unified voltage standard issued by the department (sometimes the test voltage is determined based on the specific operating conditions of the equipment) and time is called the withstand voltage test.
The voltage withstand test resonant device is used to test the ability of electrical appliances, electrical equipment, electrical devices, electrical circuits, and electrical safety equipment to withstand overvoltage. There are two types of tests: power frequency withstand voltage test and DC withstand voltage test. The test voltage for power frequency withstand voltage test is more than one to several times the rated voltage of the tested equipment, not less than 1000V. The pressurization time is 1 minute for equipment mainly insulated with porcelain and liquid, 5 minutes for equipment mainly insulated with organic solids, 3 minutes for voltage transformers, and 10 minutes for oil immersed power cables. The DC withstand voltage test can be conducted by measuring the leakage current at different test voltages and plotting the leakage current voltage characteristic curve. Electrical equipment can detect local insulation defects, moisture, and aging through withstand voltage testing.
Voltage withstand test resonant device test method:
The resonant device for withstand voltage test generally refers to AC withstand voltage, which is very strict and effective in testing the insulation ability of the tested object to withstand various overvoltages, and is of great significance in ensuring the safe operation of the equipment.
Below, we will take the inductive power frequency withstand voltage as an example to introduce in detail the test method of the withstand voltage test:
1. Overcurrent protection setting: Set the low-voltage current relay and high-voltage current relay separately in the control panel, usually set to 1.1 times the test current.
2. Overvoltage protection setting: Set to 1.1 times the voltage during the test.
Example: When the test voltage is 45KV, the display should be adjusted to 47KV.
4. Connect the shielding wire of the voltage divider to the two high-voltage terminals on the control console. Note that all ground wires must be securely and reliably connected.
5. Connect the high-voltage current K1 and K2 on the excitation transformer to the high-voltage current terminals on the control panel.
6. Voltage endurance time setting: Set the test time on the time relay to the desired test time.
7. Connect the test wiring as shown in the diagram and check for errors before closing.
8. Close the circuit breaker on the control panel. If the voltage regulator is not in the zero position, it will automatically return to zero. The test can only be conducted after the regulator returns to zero.
9. Generally, before the main power supply is not connected, adjust the reactor core clearance, and observe whether the lifting and clearance limit protection functions are normal. In addition, properly adjust the voltage rise and fall, and observe whether the button and low-voltage voltage meter head work normally.