The insulating spacer

a key element of gas insulated metal closed switchgear (GIS)

is prone to insulation defects and aging cracking due to long-term electrical thermal stress

which is one of the main reasons for the failure of GIS equipment. The characterization of activation energy can effectively describe the deterioration degree of the insulating spacer material

so it is important to study the effective calculation method of activation energy during the deterioration process of the insulating spacer. In this paper

the thermal analysis kinetics is studied based on the accelerated aging test samples. The pyrolysis process of the insulating spacer is analyzed by traditional thermal weightlessness test

and the activation energy of the insulating spacer is calculated by Flynn-Wall-Ozawa method. Furthermore

a method for calculating conductive activation energy based on leakage current is set up to perform conductive activation energy calculation of different aging experiment samples. Finally

it is found through comparison and analysis with the traditional Flynn-Wall-Ozawa method that the calculation results and the aging correlation of the two methods are basically identical. Furthermore

the characterization means and correlation of the aging degree of the two methods are analyzed in theory. The above research provides theoretical guidance and experimental analysis for calculating activation energy of insulating spacer without damage

and helps to reveal the pyrolysis aging mechanism of the insulating spacer.