1. The device has protection functions such as overvoltage, overcurrent, zero start, and system mismatch (flashover). The overvoltage and overcurrent protection value can be set according to user needs. When the test sample flashover occurs, the flashover protection action can be taken and the flashover voltage value can be recorded for testing and analysis.
2. The entire device is lightweight and easy to use on site.
3. The device has three working modes: fully automatic mode, manual mode, and automatic tuning manual boosting mode; Convenient for users to flexibly choose according to on-site conditions, improving testing speed.
4. It can store and print data from different locations, and the stored data is numbered, making it easy for users to identify and search.
5. When the device automatically scans, the frequency starting point can be set within the specified range, and the scanning direction can be selected upwards or downwards. At the same time, the LCD screen displays the scanning curve, making it easy for users to intuitively understand whether they have found the resonance point.
6. By adopting DSP platform technology, functions and upgrades can be added or removed according to user needs, and the human-machine exchange interface is more user-friendly.
7. The required power capacity is greatly reduced. Series resonant power supply is a device that generates high voltage and large current through resonance between resonant reactors and tested capacitors. In the entire system, the power supply only needs to provide the active power consumption in the system, so the required power supply for the test is only 1/Q of the test capacity.
8. The weight and volume of the equipment have been greatly reduced. In the series resonant device, the bulky high-power voltage regulation device and ordinary high-power power frequency test transformer are eliminated, and the resonant excitation power supply only needs 1/Q of the test capacity, greatly reducing the weight and volume of the system, which is generally 1/10-1/30 of the ordinary test device.
9. Effectively improve the output voltage waveform. A resonant power supply is a resonant filtering circuit that can improve the waveform distortion of the output voltage, obtain a good sinusoidal waveform, and effectively prevent the accidental breakdown of the test sample by harmonic peaks.
10. Prevent large short-circuit currents from burning the fault point. In the series resonance state, when the insulation weakness of the test sample is broken down, the circuit immediately becomes de tuned, and the circuit current rapidly drops to 1/Q of the normal test current. However, when conducting a withstand voltage test using parallel resonance or a test transformer, the breakdown current immediately increases by several tens of times. Compared to the two, the short-circuit current and breakdown current differ by hundreds of times. Series resonance can effectively identify insulation weaknesses without the concern of large short-circuit currents burning fault points.
11. There will be no recovery overvoltage. When the test object experiences breakdown, due to the loss of resonance conditions, the high voltage immediately disappears, the arc extinguishes immediately, and the process of rebuilding the restored voltage is long, making it easy to disconnect the power supply before reaching the flashover voltage again. This voltage recovery process is an intermittent oscillation process of energy accumulation, which is long and does not result in any restored overvoltage.
