GDTF-250/50 Generator High Voltage AC Resonance Test Set
Product Description
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.
- Automatic mode, Manual mode, Automatic tuning manual boosting mode.
- Data can be stored, and the stored data 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 displays the scanning curve, which is convenient to know 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: one time 60s at rated value.
4. Quality factor of the equipment: Q >50
5. Quality factor of GIS in full load test: Q > 20 ( Related to load)
6. Input power supply: Single phase 220V or three phase 380V;
7. Frequency adjusting range: 30-300Hz
8. System measurement accuracy: 1.5%
9. Over-voltage, over-current, zero-start protection
Parameters for Individual Parts
1. Variable frequency power supply GDTF -22kW/220/380V (1 set)
- Rated output capacity: 22kW
- Working power supply: 3-phase 380V or single phase 220V±5%,50Hz
- Output voltage: 0-400V adjustable
- Rated input current: 55A
- Rated output current: 55A
- Voltage resolution: 0.01kV
- Voltage measuring accuracy: 0.5%
- Frequency adjusting range: 30-300Hz
- Frequency adjusting resolution: ≤0.1Hz
- Frequency stability: 0.1%
- Working time: constant working of 5mins under rated capacity.
- Temperature rise: ≤ 65K after constant working of 5mins under rated capacity.
- Noise: ≤50dB
- Weight: approx. 22kg.
2. HV Reactor GDDK-62.5kVA/25kV (4 sets)
- Rated capacity: 62.5kVA
- Rated voltage: 25kV
- Rated current: 2.5A
- Rated inductance: 32H (per set)
- Continuous working time: 1min
- Temperature rise: <65K
- Working frequency: 30-300Hz
3. Exciting Transformer GDJL-22kVA/5kV/0.4kV (1 set)
- Rated capacity: 22kVA
- Input voltage: 0-400V, single phase
- Output voltage: 5kV
- Output current: 4.4A
4. Capacitive Divider GDFR-50kV/2000pF (1 set)
- Rated voltage: 50kV
- Capacitance: 2000pF
- Working frequency: 30-300Hz
- Measuring accuracy: 1.5%
- Rated voltage: 50kV/2000pF
5. Filter Capacitor GDBC-60kV/25000pF (1 set)
- Rated voltage: 60kV
- Capacitance: 25000pF
- Working frequency: 30-300Hz
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