Voltage test and insulation test are both test methods for electrical equipment. However, it is generally necessary to do the insulation test before the voltage test, because the voltage is a destructive test, only to ensure that the insulation of the equipment is not a problem, and then to play the voltage will not cause unnecessary burning of the electrical equipment. What’s the difference between these two experiments?

1. Different definitions

Voltage resistance test is one of the main methods to test the ability of electrical appliances, electrical equipment, electrical devices, electrical lines and electrical safety appliances to withstand over-voltage. Insulation test: Electrical equipment during operation, always under the influence of various external factors, its performance will continue to change, these external factors mainly include external electric field, environment, high pressure, corrosion degree and machinery.

2. Different test methods

Pressure resistance: mainly divided into hydraulic test and air pressure test for electrical equipment pressure resistance test. Insulation: According to the level of voltage in the test process, the insulation test is divided into insulation characteristics test and insulation voltage test. The equipment can be diagnosed and tested in the case of power failure by using the non-destructive test and voltage AC test mentioned above, and only after the completion of the non-destructive test can the destructive test be carried out.

3. Different voltages

Insulation: Insulation resistance is measured by insulation resistance tester (below 10000 V) or insulation gauge (below 2500 V), because the test voltage is relatively low, so many insulation defects are not easy to be found.

Insulation test because of the low voltage test, it is not easy to damage the test equipment; Due to the high test voltage, the voltage test is easy to damage the tested equipment during the pressure, especially in some cases, although the voltage test has passed, it has caused damage to the tested equipment, and the test personnel will use a low voltage insulation test to test the insulation of the tested equipment after the voltage test. Withstand voltage: withstand voltage test The test voltage is high, it is easy to find the insulation defects of high voltage equipment.

Under the influence of some unfavorable factors, the power equipment is more prone to unpredictable failures, and the serious ones will lead to the interruption of power operation. Therefore, before the high-voltage electrical equipment in the power system is put into operation, the insulation test should be carried out in advance to ensure the safe and stable operation of the power system.