A Review on the Insulating Feature Quantity of Transformer Bushing Field Testing Technology and Research Status

Transformer bushing is an important electrical equipment used in power system, it is important for field testing technology of transformer bushing. There are many feature amounts can be used to reflect transformer bushing insulation condition, which including dielectric loss, leakage current, capacitance, insulation resistance, bushing temperature, transformer oil component, SF6 gas components, the frequency domain dielectric spectroscopy, bushing voltage, the most representative feature amount is the dielectric loss, this paper summarizes the measurement methods and research status of insulating feature quantity, introduces data processing method in detection system. Interference issues and reliability issues are problems encountered in field testing, it need to take measures to suppress interference, enhance reliability, and a number of direction for further research in bushing field testing technology is proposed.