HCTT 400KV/400KVA AC Test Transformer

Mode: HCTT 400KV/400KVA
Cylinder Type, Single phase, Frequency: 50Hz or 60Hz
Rated Capacity: 400kVA
Rated voltage:
LV Voltage: 2x3kV      HV Voltage: 200kV/ 400kV
Rated Current:
LV current: 2x66.6A      HV Current: 1A
Low voltage winding can be serial connected or parallel connected:
When serial connected: HV output 200kV 1A
When parallel connected: HV output 400kV 1A
Measuring winding voltage ratio: 1000:1
Cooling methods: ONAN
No-load current ≤10%
Waveform deviation ≤3%
Impedance voltage ≤10%
Dielectric loss < 0.4%
Noise level < 60dB (Full load at 4 meter distance)
Measuring winding voltage ratio: 1000/1
PD Level: <5pC @400kV, test with complete test system; <3pC @300kV

Running time and temperature raise: running 1 hour at 100% UH and 100%IH; Transformer winding temperature raise less than 65K, oil surface temperature raise less than 55K.
Over-current capability: withstand 300s at 125%IH, no damage to transformer winding.
Over-voltage capability: withstand 60s at 110%UH, no damage to transformer insulation.

 
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)
Insulation Level: 5kV/1min (measurement winding to earth; HV terminal to earth; LV winding to earth)
Electric Strength of Transformer Oil: 
Transformer Oil: 25# China made
- Breakdown Voltage>60kV/2.5mm  
- Moisture<10ppm
- Dielectric Loss<0.2%（at 90℃）
- Without acetylene in oil; Solidifying point>40
- Air content < 1%
Transformer height: approx. 3400mm
Maximum diameter: 2000mm
Overall weight: 6600kg

Principle Diagram: