HDXZ-216kVA/216kV Variable Frequency AC Resonant Test System is applied for AC dielectric test for power substation at 10KV-600KV and electrical equipment,such as transformers,GIS system SF6 gas switches,cables,and casings.
The system is mainly composed of following parts:variable frequency control power supply,exciting transformer,reactor and capacitive divider.
1.With the function of over-voltage, over-current, zero-start, system detune (flashover) protection. Over-voltage, over-current protection value can be set accordingly to user' need. Flashover protection action when the test object flash over and tester records the flashover voltage value for testing analyze.
2.Small volume, light weight, very suitable for the operation people on the spot.7. Reduced greatly the required power capacitance , resonant equipment power can generate high voltage and large current by using the resonance of resonant reactor and test capacitor. Power can supply the loss power in the system , which only requires 1/Q of the resonant excitation power during the test .
3.There are three kinds of working modes, which is convenient for user choosing according to on-site condition. Working modes : Automatic mode, Manual mode, Automatic tuning manual boost mode.
4.Data can be stored and printed in different places, and the series numbers are figures which is convenient for identification and searching.
5.When the device automatically sweeps the frequency, the starting point of frequency can be set arbitrarily in the specified range. Meanwhile, the LCD screen displays the scanning curve, which is convenient for users to directly understand whether the resonance point is found .
6.Adopting DSP technology, which can increase and decrease functions and updated accordingly to the user's need, it also makes the human-machine interface more humanized.
8. Reduced greatly weight and dimension of the equipment . The series resonant power supply not only eliminates the bulky high-power voltage regulator and ordinary high-power frequency test transformer, but also requires the 1/Q of the resonant excitation power to reduce the weight and dimension of the system, which is generally 1/10-1/30 of the common test device.
9.Improve the output of voltage wave .The resonant power supply is a resonant filter circuit, which can improve the waveform distortion of output voltage and get the good sinusoidal waveform effectively preventing the error breakdown of the harmonic peak to the test object.
10.Prevent large short circuit current burn fault point. When test object is breakdown in the series resonant state, the circuit is detuned immediately and the circuit current drops rapidly to the 1/Q of normal tested current .The breakdown current increase to dozens of time during power frequency withstand test of transformer. Compared with two test methods , short current and breakdown current is hundreds of times different . Resonance test equipment can efficiently find the insulation weakness and large short circuit current burn fault point.
11. No-recovery over-voltage . When test object is break down , high voltage immediately disappear also immediately extinguished due to the loss reasonance condition. It takes a long time to recovery flashover voltage before cutting off the power .This voltage recovery process is a kind of energy accumulation of intermittent oscillation process, there is no any recovery over-voltage in the process .
|Rated output voltage||0~216kV(AC)and below|
|Waveform of Resonance voltage||pure sine wave,THD<1.0%|
|Max.test capacity||216kVA and below|
|Duty Cycle||full power output,continuous working time of 15mins|
|Frequency adjustment sensitivity||0.1Hz,instability<0.05%|