HCTT 50KV/7KVA Test Transformer

Mode: HCTT 50KV/7KVA
Cylinder type                                         HV current: 0.14A
Single phase                                        Cooling methods: ONAN
Frequency: 50Hz                                  No-load current ≤10%
Rated Capacity: 7kVA                          Waveform deviation ≤5%
Rated input voltage: 0.38kV               Impedance voltage ≤10%
HV winding: 50kV                                PD Level: <5pC at 100%UH of complete test system

Over-current capability: Working for 300s allowed at 150%In, not cause any damage to transformer winding and insulation.
Over-voltage capability: Working for 60s allowed at 110% rated current, not cause any damage to transformer insulation.
Insulation level: withstand 3kV/min (Low voltage input ending to ground)
Working time: working 60 min under 100% rated voltage; Continuous working allowed at 80% rated current & voltage; and temperature rise of transformer winding is less than 65K, temperature rise of oil surface is less than 55K.

Transformer Oil: 
25# transformer oil is from Karamay Refinery. The oil indicator can reach the oil level for 500KV transformers. Factory test of test transformer should use new transformer oil supplying with transformers and perform oil inspection before or after factory test. Oil inspection report should be provided when the transformer delivered filled with oil. Quality of transformer oil should meet the requirements of SH0040-91, GB2536-90, GB7595-87, SD187-86, Class II A of IEC-296 standards. Components PCB are prohibited in the oil. When doing acceptance test on-site, the oil performance should satisfy the following requirements: DGA analysis of total hydrocarbons less than 10 mg/L, the breakdown voltage of the oil should not be less than 65kV/2.5mm, dielectric loss (90°C)is not more than 0.3%, water content is not more than 10mg/L, the gas content is not more than 1%.

Principle Diagram: