... glass fiber thin insulation resin dry type transformer---SC( B)9, SC( B)10 ... the renewed oil immersed type, be applicable to the power plant, high buildings, commerce center, theater, hospital ... level: 1)10 KV class product: power frequency withstand voltage 35 KV, impulse withstand voltage 75 KV ... impulse withstand voltage 125 KV 3)35 KV class product: power frequency withstand voltage 70 KV, impulse ...