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Transformer is the main equipment of power system, its operation reliability is directly related to power system security and reliability of power supply. In order to guarantee the safe operation of power system, must strengthen the monitoring of the main transformer.With the development and popularization of intelligent station, the detection of transformers insulation is faced with the new problem that PT signal is not convenient to get and even unable to get. This paper proposes the relative method which is used to calculate and monitor dielectric loss of transformer bushing and designs the on-line monitoring device, through the data acquiring form the on-line monitoring instrument which are installed in the transformer of substation shows that this method has high precision, strong anti-interference ability.

CPS (control and protective switching) one of the smart integrated include the function of circuit breakers, contactors, and low-voltage electrical appliances. The contact system is different from the traditional low-voltage electrical function. Well-designed structure of the contact system has important practical significance for overall performance of CPS. The paper proposes a new contact system. The simulation analyze the electrical repulsion of the traditional contact system and a new contact system under different current size, breaking time, blowing arc magnetic field analysis by electromagnetic simulation software. According to the results of the simulation comparison, prove that the new contactor structure making the function of CPS increased.