On ground of absorbing and imbibing advanced technologies and research and development designing from both home and abroad, we put improvement of products’ reliability as the tenet and referto technological research and development to conduct gradual perfection on techniques and structure and strict quality system control so that products we produce are greeted with good reputationamong myriads users. Through re-designing of coil duct, we help lower hot-spot temperature. There-designed oil tank amplifies heat dissipation area and ensures that aging of oil will not be triggeredduring severe overload. When the transformer is severely overloaded, the coil insulation is not aging or undergoing thermal runaway. It can maintain superior behaviors of electricity and mechanicalproperty