HCTT 250kV/15kVA Test Transformer

Mode: HCTT 250KV/15KVA
Cylinder type                                                                                      Rated input current: 37.5A
Single phase                                                                                        Rated output current: 0.06A
Frequency: 50Hz                                                                                Cooling methods: ONAN
Rated Capacity: 15kVA                                                                      No-load current ≤10%
Rated input voltage: 0.4kV                                                               Waveform deviation ≤5%
Rated output voltage: 250kV                                                            Impedance voltage ≤10%
PD Level: <2pC at 100%UH of complete test system

Working for one hour on, one hour off 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.

 
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: