Power frequency withstand voltage test device. Composed of accessories such as 240 kVA/200 kV~400 kV variable frequency power supply, transformer, reactor, coupling capacitor, etc. The series resonance testing device has low waveform distortion, good stability, and functions such as frequency modulation, voltage regulation, operation, protection, and control. Provided assurance for on-site partial discharge testing. However, due to different testing items, the wiring method of the FM series resonance testing device is also different. For the possible problems of large transformers in partial discharge tests, we will take 220kV and 240 transformers as an example. By analyzing and calculating to select a reasonable wiring method, the testing work is completed, thereby improving the quality and efficiency of testing, and accumulating rich experience for future work.

(1) Variable frequency power supply

Variable frequency power supply is the core of the equipment. It can change the input power supply of AC220V/to output 350V at 380V and 50Hz, 30-300Hz, with adjustable voltage output from 0 to 350V, and has integrated protection, control, and monitoring functions.

(2) Drive Transformer

Drive the transformer with dual input low voltage of 350v, 400v, 450v, dual output high voltage of 65kv, capacity of 200kva, and isolate high and low voltage simultaneously.

(3) Reactor

Reactor is the core component of high-voltage resonant circuit, which has the characteristics of flexible combination, good linearity, and uniform pressure. The structure is immersed in oil inside the iron core, with a single section of 32.5kV.

(4) Coupling capacitor

The coupling capacitor is used to measure the high voltage value of the sample. By using a frequency modulation series resonant device, resonance is generated by adjusting the resonant frequency to achieve the required test voltage and capacity, thus completing various test schemes. The resonant system has the characteristics of low noise, light weight, and suitability for on-site use. Greatly reducing employees' physical labor and improving work efficiency.

Leseries resonance test device is a specialized equipment for the testing profession. It has low waveform distortion, good stability, and functions such as frequency modulation, voltage regulation, operation, protection, and control. We adopt a portable, compact, and lightweight design, suitable for outdoor use.