Research of on-line insulation monitoring in the high-voltage electric equipment

To insure operating of the high-voltage electric equipment stably,reliably and economically should be met with the fast development of the power system capacity.This paper introduced the on-line insulation monitoring methods and the main insulation signal processing as well as the feature of the monitoring system.The essential insulation information of the main electric equipments(including arrestor,capacitive device,transformer,GIS etc) in substation was also discussed.This is important reference to power companies in their improving operating reliability,reducing operation and maintenance cost,delaying the insulation life of electric equipments.