Analysis of the electric field for void defect of 345kV cable based on finite element method

• Main Authors: Zhe-WeiZhan, 詹哲瑋
• Other Authors: Jiann-Fuh Chen
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/6gxhtr

碩士 === 國立成功大學 === 電機工程學系 === 105 === The purpose of this research is to analyze the electric field distribution with COMSOL software when the insulation of 345kV cable has a void defect inside. The simulation based on finite element method, used the oil-filled cable and Cross-linked polyethylene (XLPE) cable that are common underground cables in Taiwan Power Company (TPC) system. The void was positioned at three different places within insulation layer and compared the results with each other. In addition to void position variation, the size of the void was also varied to determine the relationship between void size and electric field. From simulation results indicated that when a void is close to the conductor, the position of highest electric field locates slightly further away to the right from the center instead of immediately adjacent to the conductor. This indicated a high probability of fault occurred at the void position with the highest electric field. Moreover, 345kV XLPE cable showed better insulation quality than oil-filled cable.