Analysis of Induced Sheath Voltage and Current within Underground Power Cables
Keywords:
Energy, Circulating current, Induced sheath voltage, Thermal breakdown, Underground power cables.Abstract
In this article, past researches related to the generation of induced sheath voltage and current were theoretically analyzed. The findings of seven different cable conditions that contribute to voltage and current induced in cable sheaths which include type of earthing methods, laying arrangement of cables, thermal resistivity of soil, material of pipe ducts, method of burying cables, spacing between cable ducts, and depth of buried cables were observed, obtained, and analyzed with the aid of CABLEIZER software. By comparison, an optimal cable condition was deduced. Furthermore, the dielectric and ohmic losses due to circulating currents in sheath, cable ampacity and cross section of underground cables according to Tenaga Nasional Berhad (TNB) standards were also discussed. A variety of software used for the study of induced sheath voltage and current were also compared and synthesized. By identifying the optimal cable condition, induced sheath voltage and current generation can be minimized and unwanted thermal breakdown within underground cables can be avoided.
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