Abstract
The maintenance rationalization to the equipment under operation and the lifetime protraction based on appropriate diagnosis result are necessary for the reduction in cost of gas insulated equipment. Therefore, the accurate state observation method for inside of equipment is requested. In this research, the new state observation method which enabled the high sensitivity detection of decomposition gas by setting up the absorbent outside of the equipment was proposed. As the result, it was shown without ruining the reliability of the equipment by the absorbent unit setting up outside of the gas insulation equipment that the high sensitivity detection of decomposition gas is possible. Because the concentration of decomposition gas shows a remarkable correlation between total electric charge of partial discharge and the lifetime is different depending on the kind of the decomposition gas, the possibility that the detailed state of the equipment can be diagnosed was shown according to the detected gaseous species and its amount. Moreover, we succeeded in the detection of the decomposition gas from the absorbent, therefore the availability of this method was shown.
