Currently the most widely used is the oil-immersed transformer and power transformer transformer two dry resin，The insulation of the power transformer is the transformer insulation system composed of insulating material，It is the basic condition of transformer normal work and running，The service life of the transformer is made of insulating materials（The oiled paper or resin, etc）In the life。The practice proved，Most transformer damage and failure is caused by the damage of the insulation system。According to the statistics，Because of the various types of insulation fault form the accident of all the transformer accidents85%The above。Attention to normal operation and maintenance management of the transformer，Its insulation material has a long use