It is made of superior material, scientific technique, advanced production test equipment according to strict technique. It has characteristic of highreliability, long service life. Accordingto different environment, it can equipped with different grade safe shell or non. The productswhich are new substitute for oil immersed power transformer, used extensively in high bui-lding, emporia, airdrome, tunnel, chemical plant, nuclear power plant, steam ect especial andimportant site.