HCTT 250kV/125KVA Test Transformer

Mode: HCTT 250KV/125KVA
Cylinder type                                                                                      Rated current: LV winding: 208.3A
Single phase                                                                                                                HV winding: 0.5A
Frequency: 50Hz                                                                               Cooling methods: ONAN
Rated Capacity: iron coil: 125kVA                                                  No-load current ≤10%
LV winding: 125kVA                                                                          Waveform deviation ≤3%
HV winding: 125kVA                                                                         Impedance voltage ≤8%
Rated voltage: LV winding: 0.6kV                                                   PD Level: <5pC at 100%Un, <2pC at 70%Un,
                           HV winding: 250kV                                                 Measuring winding voltage ratio: 1000:1

Insulation between winding to ground:
HV winding to LV winding and measuring winding and ground: 1500MΩ;
LV winding to HV winding and measuring winding and ground: 1500MΩ;
Measuring winding to HV winding and LV winding and ground: 1500MΩ;
Working for 60 minutes allowed at 100% rated current & 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.
Overall height: 2300mm (Adopt aluminum top electrode)
Overall weight: 2200kg

 
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: