Partial discharge in high voltage equipments-HV cable

The paper titled ldquopartial discharge in HV equipmentsrdquo mainly consists of details about partial discharge detection system and analysis of partial discharge distributions. The ever increasing demand for electrical energy has led to erection of high voltage transmission lines of 765 kV, 1000 kV, HV cables, capacitors etc. As the voltage goes high, even if the losses become considerably less, the insulation failure becomes critical. The internal as well as surface discharges may affect the working life of insulation and may ultimately be responsible for insulation failure. It thus becomes necessary to measure some aspect of the discharge in order to ensure that the life of the insulation is not affected substantially. Here comes the significance of partial discharge testing. Partial discharge occurs in gaseous, liquid, solid or in any combination of insulation system at extremely non uniform field locations above particular field intensity. The direction of discharge is based on energy exchanges which take place during the discharges. For this one should know how to determine the presence of discharge, voltage at which they appear the location of discharge, the magnitude of this discharge and deterioration limit by analysis of the partial discharge distribution. Here an HV equipment sample HV cable is selected. A detailed description including technical details of test set up, graphical analysis of PD distributions of the sample with observation table and conclusions obtained are the paper contents.