INVESTIGATION OF PARTIAL DISCHARGE BEHAVIOUR AND VISUAL TRACKING OF BREAKDOWN PROCESS ON XLPE INTERFACES UNDER DC VOLTAGE STRESS

• Main Author: Danu Diharja, Kurniawan
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/40020
• Institution: Institut Teknologi Bandung

A better understanding of the degradation process on joint cable with XLPE-XLPE interfaces is very important for the reliability of the system's operation of an HVDC cable transmission line. This thesis investigated the effect of using lubricants such as silicon oil or ester oil and the effects of interfacial pressure on the discharge and tracking failure at the XLPE interface under DC voltage stress. The thesis analyzing the PD Pattern characteristic change and tracking failure properties such as brightness of discharge and carbonization process during the voltage increased until the breakdown. To do these two types of test configurations were made, configuration 1 to find out the effect of lubricant and configuration 2 to find out the effect of pressure on the interface. Test voltage was gradually increase applied to a pair of circular electrodes at the specimens with the insulation distance of ~10 mm. After the separation of noise with PD is done, PD statistical properties such as PD waveform shape, amplitude, number and repetition rate of PD during the tracking failure up to the breakdown are obtained and delivered. The discharge light from discharge to tracking failure and the tracking patterns of a breakdown were recorded with a digital camera. Then the discharge light and carbonization effect were analyzed. The results have shown differences in the character of lubricant usage or application of pressure on the interface by showing differences in the breakdown voltage, the distribution of PD characteristic differences and the characteristics of the discharge light, carbonization process and tracking pattern at the interface. There is still much more in-depth research that needs to be done to better understand this phenomenon, but the PD Pattern analysis and analysis tracking failure help understand the effect of voltage changes and mechanisms when a breakdown of the XLPE interface is used on the cable joint.