Thefrequency conversion series resonance withstand voltage testis an indispensable testing method for the daily debugging of electrical equipment.

(1) AC voltage withstand test for power cables. The traditional DC withstand voltage method has many problems in the testing of cross-linked cables. Due to the fact that cross-linked cables are high-capacity test samples, the frequency conversion series resonance withstand voltage test method is simple and convenient. It can also obtain good AC voltage frequency and waveform, making it the most ideal testing method for AC withstand voltage testing of cross-linked cables at present.

2) AC withstand voltage test for power transformers, reactors, and transformers. The AC withstand voltage test for power transformers, reactors, and transformers has been clearly defined internationally. Both the power frequency voltage test method and the induced voltage test method can be used, and the test voltage waveform should be as close to sine as possible. Under this standard, the variable frequency series resonant withstand voltage test circuit can complete the test under any conditions. The wide frequency and voltage range of the device have good adaptability to the test sample, and can be used with various voltage levels of test samples.  

(3) AC withstand voltage test for SF6 enclosed composite electrical equipment. The AC withstand voltage test method is an important method for checking the main insulation condition of SF6 enclosed composite electrical equipment after installation. In most cases, a series resonance test device is used.  

(4) AC voltage withstand test for other equipment. Other equipment such as circuit breakers and bushings. The voltage withstand test generally requires a power frequency voltage test, in the case where the power frequency test device cannot meet the on-site requirements. The resonant withstand voltage test method can also be used as a substitute. When using resonance withstand voltage test, due to the small capacitance of the capacitor, the test frequency will be higher. But it is also possible to use a series resonance test device with appropriate compensation capacitance to reduce the test frequency and achieve a test frequency close to the power frequency.