Insulation status detection on the high voltage bushing by FRA method

This paper mainly discusses the mechanism for FRA method on bushing insulation detection. It builds several RC models of the bushing instruction in MATLAB, as well as does some simulation work to observe the change of the FRA curve with different parameters. It also takes the influence of the valve wire into consider and get some useful conclusions. Simulation results show that the obvious indentation in the FRA curve will appear when the bushing has some insulation defects. The sum and change state of the indentation in FRA curve is related to the degree and relaxation polarization of the insulation defects of the bushing. It is found that the simulation and on-spot detection curves have tallies with each other, which verifies the feasibility of FRA method in this field.