... The products which are new substitute for oil immersed power transformer, used extensively in high building, emporia, airdrome, ... .4.2 High mechanical intension.4.3 Low loss, low noise, obviously save energy, free from ... Small size, light weight, little covering space, low expenses.5.Structure5.1 The iron core is ... is inclined joints fold type.5.2 Low-voltage coil structure that is foil type rounded ...