... glass fiber thin insulation resin dry type transformer---SC( B)9, SC( B) ... immersed type, be applicable to the power plant, high buildings, commerce center, theater, hospital, laboratory, ... 8. short-circuit impedance :Standard impedance ( see performance parameters table) 9. service condition: humidity 100%, ... level: 1)10 KV class product: power frequency withstand voltage 35 KV, impulse withstand voltage ...