GDTF-2700kVA/900kV is specially designed for AC withstand voltage test for 500kV or below switch, GIS, instrument transformers and neutral point of main transformers.The system includes Variable frequency power supply, exciting transformer, reactor, and capacitive voltage divider.

Product Features:-

1. Small power of required power supply. The power source of series resonance uses the resonant reactor and test object capacitance to generate high voltage and high current. In the whole system, the power supply only needs to supply the part of active loss. Therefore, required test power is the 1 / Q of test capacity.

2. Light weight and small size. In the series resonant power supply, it does not use heavy high-power voltage regulators and traditional high-power power frequency test transformers. The resonant excitation power supply only needs 1/Q of the test capacity, which greatly reduces the weight and volume of the system, generally 1/10-1/30 of traditional test equipment.

3. Good waveform of output voltage. Resonant power source is resonant filter circuit, which improves the distortion of output voltage waveform and obtain good sine wave. It greatly prevents the test object from breakdown of harmonic peak.

4. High short-circuit current will not burn the fault point. In the status of series resonant, when the test object insulation weakness is breakdown, circuit detune immediately, and the loop current rapidly drop to 1 / Q of normal testing current. While tested by parallel resonant or testing transformer, the breakdown current rise dozens of times immediately. Therefore, testing by series resonant can find the insulation weakness effectively and high short-circuit current will not burn fault point.

5. Any recovery overvoltage is not appeared. When the test object breakdown, the resonance will be disappeared and high voltage also disappear immediately, arc extinguish at once, and the time of recovering voltage is long, it will disconnect power supply before reaching the flashover voltage. The voltage recovery process is a kind of energy accumulation of intermittent oscillation, the process is long, and any recovery overvoltage will not be appeared.

Technical Specifications:-

Variable frequency power supply GDTF-150kVA/380V (1 set)

•  Rated output capacity: 150kVA

•  Working power supply: 380V±10%, 45-65Hz

•  Output voltage: 0-380V adjustable.

•  Rated output current: 0-375A

•  Voltage resolution: 0.01kV

•  Frequency adjusting range: 30-300Hz.

•   Frequency adjusting resolution: ≤0.1Hz

•  Frequency instability: ≤0.02%

HV Reactor GDDK-900kVA/300kV (3pcs)

•  Rated capacity: 900kVA

•   Rated voltage: 300kV

•  Rated current: 3A.

•  Rated inductance: 200H (per set)

•  Continuous working time: 60mins

•  Temperature rise: <60K

•  Working frequency: 30-300Hz

Exciting Transformer GDJL-150kVA (1 set)

•  Rated capacity: 150kVA

•   Input voltage: 0-400V.

•  Output voltage: 10/15/30/45kV.

Capacitive Divider GDFR-900kV/300pF (1 set)

•   Capacitance: 300pF

•   Working frequency: 30-300Hz

•  Measuring accuracy: 1.5%

•   Rated voltage: 300kV/900pF, 600kV/450pF, 900kV/300pF

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