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1. The required power capacity is greatly reduced. The series resonant power supply uses resonant reactors and the capacitance of the test object to generate high voltage and large current. In the entire system, the power supply only needs to provide the active power consumption part, so the power required for the test is only 1/Q of the test capacity.
2. The weight and volume of the equipment are greatly reduced. In the series resonant power supply, not only the bulky high-power voltage regulator and ordinary high-power power frequency test transformer are omitted, but also the resonant excitation power supply only needs 1/Q of the test capacity, greatly reducing the system weight and volume, generally 1/10 of ordinary test devices.
3. Improve the waveform of the output voltage. The resonant power supply is a resonant filter circuit that can improve the waveform distortion of the output voltage, obtain a good sine wave, and effectively prevent harmonic peaks from causing false breakdown of the test object.
4. Prevent large short-circuit currents from burning the fault point. In the series resonant state, when the insulation weakness of the test object breaks down, the circuit immediately detunes, and the loop current rapidly drops to 1/Q of the normal test current. In contrast, when using parallel resonance or test transformer method for withstand voltage tests, the breakdown current immediately rises dozens of times. Comparing the two, the short-circuit current and breakdown current differ by hundreds of times. Therefore, series resonance can effectively find insulation weaknesses without the worry of large short-circuit currents burning the fault point.
5. No recovery overvoltage will occur. When the test object breaks down, due to the loss of resonance conditions, the high voltage immediately disappears, the arc is extinguished instantly, and the re-establishment process of recovery voltage is very long, making it easy to disconnect the power before reaching the flashover voltage again. This voltage recovery process is an intermittent oscillation process of energy accumulation, which is long and will not produce any recovery overvoltage.
