Application of Comprehensive Diagnosis Technique in Fault Analysis of FRP Bushing of 110kV Transformer

Abstract

FRP high-voltage bushing is widely used in power system because of its advantages of good mechanical strength, short production cycle and free maintenance. Due to the immobility of solid insulation such as glass fiber reinforced plastic and epoxy resin, once there is a local hidden danger, it will not heal itself, which is bound to develop into insulation breakdown. In this paper, starting from the creepage fault of a 110kV transformer FRP high-voltage bushing, comprehensive diagnosis techniques such as test detection, online monitoring, disintegration analysis and simulation calculation are adopted. Different diagnosis methods confirm each other and determine the cause of the fault. The analysis method in this paper has important reference value for fault analysis of high voltage equipment.