MOEORW-XB-1000kVA-500kV Series Resonance Device Send email to us

The device is mainly designed and manufactured for AC withstand voltage test of 10kV, 35kV, 110kV, 220kV cables; 110kV/80000kVA main transformers are fully insulated; 110kV, 220kV GIS, switches, and circuit breakers. The reactor adopts a multiple separate design, which can meet the test conditions of high voltage and low current equipment, and can also meet the AC withstand voltage test requirements of low voltage such as 10kV cables. It has a wide range of applications and is an ideal withstand voltage equipment for high-voltage test departments at the prefecture, city, and county levels and power installation and repair engineering units.

The device is mainly composed of a variable frequency control power supply, an excitation transformer, a reactor, and a capacitor voltage divider.

Advantages of series resonance in power systems:

1. The required power capacity is greatly reduced. The series resonant power supply uses the resonance of the resonant reactor and the capacitor of the test object to generate high voltage and large current. In the whole system, the power supply only needs to provide the active consumption part of the system. Therefore, 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 the ordinary high-power power frequency test transformer are eliminated, but also the resonant excitation power supply only needs 1/Q of the test capacity, which greatly reduces the weight and volume of the system, generally 1/10 of the ordinary test device.

3. Improve the waveform of the output voltage. The resonant power supply is a resonant filter circuit, which can improve the waveform distortion of the output voltage, obtain a good sine waveform, and effectively prevent the harmonic peak from erroneously breaking down the test object.

4. Prevent large short-circuit current from burning the fault point. In the series resonant state, when the insulation weakness of the test object is broken down, the circuit is immediately detuned, and the loop current quickly drops to 1/Q of the normal test current. When the parallel resonance or test transformer is used for withstand voltage test, the breakdown current immediately rises by dozens of times. Compared with the two, the short-circuit current differs by hundreds of times from the breakdown current. Therefore, series resonance can effectively find insulation weaknesses, and there is no worry about large short-circuit current burning the fault point.

5. There will be no recovery overvoltage. When the test product breaks down, the high voltage disappears immediately due to the loss of resonance conditions, the arc is extinguished immediately, and the recovery voltage re-establishment process is very long. It is 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 a long process and no recovery overvoltage will occur.