For obtaining the insulation status of capacitive equipment in operation in time and improving operation reliability of substation

a real-time live on-line monitoring system is constructed with the relative dielectric loss test as the important reference of the insulation performance judgement of capacitive equipment

which improves greatly the detection efficiency. The monitoring system is set up by way of setting wireless monitoring units at the same voltage class

frequency and phase busbar under the various substations of the same power system so to collect the loop current data and calculate real time the relative dielectric loss. Moreover

the identification information of multiple capacitive devices is used to locate the equipment with insulation defect from the equipment by comparison each other. The on-line monitoring of insulation defect of the capacitive equipment is achieved. The application case shows that this system has good monitoring effect.