HCTT-400kV/800kVA AC Test Transformer

Mode: HCTT 400KV/800KVA
Cylinder Type,  Single Phase,  Frequency: 50Hz or 60Hz
Rated Capacity: 800kVA
Rated Voltage: 400kV
Rated Current: 2A
Power Frequency Withstand Voltage Level:440kV/1min ,low voltage 5KV/1min
Short Circuit Impedance: ≤8

Running time and Temperature Raise: running allowe1 hour at 100% UH and 100%IH; 2/3 rated voltage and 2/3 rated current ,allowed continuous running ; Transformer winding temperature raise less than 65K, oil surface temperature raise less than 55K.
Cooling methods: ONAN
Over-current capability: withstand 300s at 110%IH, no damage to transformer winding.
Over-voltage capability: withstand 60s at 110%UH, no damage to transformer insulation.
Short circuit capability:320kV discharge to plate through protective resistor ,no damage to transformer insulation
Protection function:Equip with 0.6kV lighting arrester at low voltage side

 
Insulation of Winding to Earth:
  >2500MΩ (HV winding to LV winding and measurement winding to earth);
  >2500MΩ (LV winding to HV and measurement winding to earth);
  >2500MΩ (measurement winding to HV and LV winding to earth)
Electric Strength of Transformer Oil: 
Transformer Oil: 25# China made
- Breakdown Voltage>60kV/2.5mm  
- Moisture<10ppm
- Dielectric Loss<0.5% (at 90℃)
- Without acetylene in oil; Solidifying point>40
- Air content < 1%  

Principle Diagram: