ANALYSIS OF CONDUCTOR TOPOLOGY INSIDE SPACER TO OPTIMIZE ELECTRIC FIELD OF 150KV GIS

• Main Author: Rizal Fabio, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/56151
• Institution: Institut Teknologi Bandung

Gas Insulated Switchgear (GIS) is a major important component in power system, especially in area where availability of land is an issue. GIS use SF6 as its main insulation instead of open air as in normal substation. One of the most important part of GIS is its spacer, spacer is a device used to hold conductor rod in its place, usually made out of epoxy resin. GIS failure is mostly caused by spacer insulation failure not the SF6 itself. Spacer insulation failure is closely related with how electric field is spread in the spacer where over time it cannot maintain its isolating property due to continuous exposure to high electric field caused by its high voltage conductor. It is an established fact that one can manipulate electric field by changing the shape of conductor, therefore it is proposed that the shape of conductor could be arranged in a manner that could reduce electric field in triple junction. Upon simulating on unmodified spacer design, it is observed to has electric field value of 2336.6 kV/m in triple junction area, where spacer, conductor rod, and SF6 meet. Removing notches in the spacer and lump in the conductor will reduce its maximum electric field to 2783.9 kV/m but will increase its maximum electric field in triple junction area to 2698.1 kV/m. Modifying the size of conductor lump and its respective notches it is found to be able to reduce its maximum electric field on triple junction area to below 500kV/m while also reducing maximum electric field value inside the spacer from unmodified value of 5361kV/m to 4312kV/m