GDTF-250/50 is specially designed for AC withstand voltage test for 20.5kV/660MW fire power generators. The capacitance to the ground is less than 0.3μF, test frequency is 45-65Hz and test voltage is no more than 44kV. Testing time is 1min.
The system includes Variable frequency power supply, exciting transformer, reactor and capacitive voltage divider.
Features
With the protection function of over-voltage, over-current,zero-start, system detune (flashover). Over-voltage, over-current protection value can be set accordingly to user’s need. Flash-over protection starts when flash-over and the flash-over voltage value will be recorded for testing analysis.
The unit piece of the device is light, suitable for field use.
There are three kinds of working mode for user choosing according to on-site condition.
Data can be stored, and the storeddata No. are figures which is easy for identification and searching.
Frequency starting point can be set in the specified scope when the device sweep frequency automatically, sweep frequency direction can be selected upward or downward, meanwhile LCD displaysthe scanning curve, which is convenient toknow if the resonant point found or not intuitively.
With DSP technology, which can increase or decrease functions and updated accordingly to the user’s need, it also makes the human-machine interface more friendly.
Specifications
1. The rated voltage: 50kV—meets AC withstand voltage testing for 20.5kV fire power generators.Working frequency: 45~65Hz, testing voltage≤44kV, testing time 1min.
2. Output voltage waveform distortion rate: < 1.0%
3. Allowing continuous working time: onetime 60s at rated value.
4. Quality factor of the equipment: Q >50
5. Quality factor of GISin full load test: Q > 20 ( Related to load)
6. Input power supply: Single phase 220V or three phase 380V;