HCTT 250KV/20KVA Test Transformer

Mode: HCTT 250KV/20KVA
Cylinder type                                    Cooling methods: ONAN
Single phase                                       No-load current ≤10%
Frequency: 50Hz                               Waveform deviation ≤3%
Rated Capacity: 20kVA                     Impedance voltage ≤8%
Rated input voltage: 0.22kV             Dielectric loss: <0.5%
Rated output voltage: 250kV            Measuring winding voltage: 100V
Rated output current: 80mA             PD level: <2pC under rated voltage

Insulation level: LV side to ground, power frequency withstand level is 5KV/1min
Working for 60 minutes allowed at 100% rated current & voltage;
Continuous working allowed at 80% rated current & voltage; and temperature rise of transformer windings is less than 65K, temperature rise of oil surface is less than 55K.
Dimension: Dia 700mm*1580mm                  
Weight: 580 kg

 
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: