Series resonance testing systemZCVF-A-675kVA/108kV

1. The device has protection functions such as overvoltage, overcurrent, zero start, and system detuning (flashover). The overvoltage and overcurrent protection value can be set according to user needs. When the test object flashover, the flashover protection action can be taken and the flashover voltage value can be recorded for test analysis.

2. The entire unit is light in weight and easy to use on site.

3. The device has three operating modes: fully automatic mode, manual mode, and automatic tuning manual boost mode; Convenient for users to flexibly select according to on-site conditions, improving the test speed.

4. It can store and print data in different places, and the stored data number is a number, which is convenient for users to identify and search.

5. When the device automatically sweeps the frequency, the frequency starting point can be arbitrarily set within the specified range, and the scanning direction can be selected upward or downward. At the same time, the LCD screen displays the scanning curve, facilitating the user to intuitively understand whether to find the resonance point.

6. Using DSP platform technology, it is possible to add or subtract functions and upgrade according to user needs, and the man-machine exchange interface is more user-friendly.

7. The required power capacity is greatly reduced. The series resonant power supply generates high voltage and large current through resonance between the resonant reactor and the capacitance of the tested object. In the entire system, the power supply only needs to provide the active power consumption part of the system, so the power required for the test is only 1/Q of the test capacity.

8. The weight and volume of the equipment have been greatly reduced. In series resonant devices, bulky high-power voltage regulating devices and ordinary high-power power frequency test transformers are omitted, 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 that of ordinary test devices.

9. Effectively improve the output voltage waveform. The resonant power supply is a resonant filter circuit that can improve the waveform distortion of the output voltage, obtain a good sinusoidal waveform, and effectively prevent the accidental breakdown of the harmonic peak on the test object.

10. Prevent large short circuit currents from burning the fault point. In the series resonance state, when the insulation weakness of the test object is broken down, the circuit immediately becomes out of tune, and the circuit current rapidly decreases to 1/Q of the normal test current. When conducting a withstand voltage test using parallel resonance or a test transformer, the breakdown current immediately increases by dozens of times. Compared to the two, the short circuit current and the breakdown current differ by hundreds of times. Series resonance can effectively find insulation weaknesses without the worry of large short-circuit currents burning fault points.

11. No recovery overvoltage will occur. When the test object undergoes a breakdown, due to the loss of resonance conditions, the high voltage also immediately disappears, and the arc immediately extinguishes. The process of reestablishing the recovery voltage is very 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 have any recovery overvoltage.