The terminals are on the tank cover, avoiding collisions and improving mechanical and electrical performance.
Selected materials are excellent, quality is reliable, and annual stability is good;
Large voltage margin, low electrical noise, and low partial discharge;
Uses new insulation materials, small size, and light weight.
◆ Output voltage: AC (0～200) KV or DC (0～280) KV.
◆ Rated capacity: 1~400kVA;
Where: Pn----nominal test transformer capacity (kVA)
Vn-----effective value of the rated output high voltage of the test transformer (kV)
K------safety factor. K≥1, when the nominal voltage Vn≥1MV, K=2; when the nominal voltage is lower, a higher K value can be taken.
Ct-----capacitance of the test object (PF)
ω----angular frequency, ω=2πf, f----frequency of the test power supply
The capacitance Ct of the test object can be measured by an AC bridge. Ct varies greatly and can be determined by the type of equipment. Typical data are as follows:
Simple bridge or suspension insulators: tens of microfarads
Simple step bushing: 100 – 1000PF
Voltage transformer: 200 – 500PF
Power transformer: < 1000kVA - 1000PF
> 1000kVA: 1000 – 10000PF
High-voltage power cables and oil-impregnated paper insulation: 250 – 300PF/m
Gas insulation: - 60PF/m
