HGTS 750kV/375kVA Gas Insulated Test Transformer

Mode: HGTS 750kV/375kVA
Casing, Stationary type              Frequency: 50Hz / 200Hz
Single phase                               Rated Capacity: 375kVA
Rated Voltage: 3kV; HV Winding: 750kV
Rated Current: 125A; HV Current: 0.5A

LV Winding can be parallel connection or serial connection:
When serial connection: HV output is 375kV/0.5A
When parallel connection: HV output is 750kV/0.5A
(HV terminal of the transformer will be earthed through a current transformer 5/5 so as to check the current value of HV side and ensure safety of the operators and equipment)
Waveform deviation ≤3%           Unload Current: IO <10%         Impedance voltage ≤20% (50Hz)
Over Voltage Ability: Overvoltage at 800kV for 60s. Then it shall not happened any insulation damage for the testing transformer.
Short-circuit Discharge Test: at 600kV (80% of rated voltage) short-circuit discharge three times via damping resistor, not cause any damage on the system.

Winding Insulation level to earth:
LV winding to HV winding, and earth >2000MΩ
Partial discharge level: ≤2pC@750kV ;≤1pC@550kV
Noise: ≤60dB         Dielectric loss: <0.5%
Operating Time: Working for one hour allowed at 100% rated current & voltage and stop 24hour; working 120min at 550kV and stop 12hour; and temperature rise of transformer windings is less than75K.
Protection: Equip surge arrestors.

Principle Diagram: