HCTT 300kV/900kVA Test Transformer

Mode: HCTT 300KV/900KVA
Cylinder type                                                                                           LV winding can be serial or parallel:
Single phase                                                                                             When serial connection, output voltage is 150kV 3A
Frequency: 50Hz                                                                                     When parallel connection, output voltage is 300kV/3A
Rated Capacity: 900kVA                                                                         Waveform deviation ≤3%
Rated Voltage: LV voltage: 3kV; HV voltage: 300kV                             Unload Current: IO<8%
Rated Current: LV current: 150A HV Current: 3A                               Impedance voltage ≤8%

Over Current Ability: Continuous working for 3 minutes under 150% rated current, then thermal damage or distortion of the winding shall not be occurred.
Over Voltage Ability: Over voltage at 110% UH (330kV) for 60s., then it shall not happened any insulation damage for the testing transformer.
Insulation Level:18kV/1min(low voltage terminal to earth)
Noise:≤60dB                          PD Level: <5pC at rated voltage

 
Winding insulation performance:
HV winding to LV winding, measuring winding and ground > 2500MΩ
LV winding to HV winding, measuring winding and ground > 2500MΩ
Measuring winding to HV winding, LV winding and ground > 2500MΩ

Transformer Oil: 
25# China made
Dielectric loss: less than 0.5%.
Operating Time: (starting from environment temperature)
One hour on and one hour off 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.
Injection and release valve for transformer oil are available.

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: