HGTS 750kV/300kVA Gas Insulated Test Transformer

Mode: HGTS 750kV/300kVA
Casing, Stationary type                                           Rated Capacity: 300kVA
Single phase                                                              Rated Voltage: excitation winding: 2x3kV; HV winding: 750kV
Frequency: 50Hz                                                      Rated Current: excitation current: 2x50A HV Current: 0.4A

LV Winding can be parallel connection or serial connection:
When serial connection: HV output is 375kV / 0.4A
When parallel connection: HV output is 750kV / 0.4A
(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 ≤12%                                          Voltage Ratio of Measurement Winding: 1000:1

Over Current Ability: Continuous working for 300S under 120% rated current (0.48A), then thermal damage or distortion of the winding shall not be occurred.
Over Voltage Ability: Over voltage at 110% UH (825kV) 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.
Insulation Level: 10kV/1min (HV terminal to earth)
Winding Insulation level to earth:
LV winding to HV winding, and earth >2000MΩ
Partial discharge level: ≤5pC, under 100% rate voltage; ≤3pC, under 80% rate voltage
Noise: ≤60dB                                                                         Dielectric loss: <0.5%
Operating Time: Working for 15 minutes allowed at 100% rated current & voltage; and temperature rise of transformer winding is less than 65K.
Protection: Equip with 3kV surge arrestor.

Principle Diagram: