Evaluation and solutions for induced voltage on the sheath of long underground cables in single-circuit medium voltage systems
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Abstract
The layout of underground cables affects the induced voltage at the sheath of the cable, which must be limited to no more than 65 V according to the electrical installation standards for Thailand to ensure safety for the operators. This paper presents the evaluation of the induced voltage at the sheath of underground cables for a single-circuit in a medium-voltage system in two formations: trefoil and flat formation with the sheath of the cable grounded at both ends. The results of the study found that the induced voltage of the trefoil formation is less and safer than the flat formation, and the practice of solving the problem of induced voltage exceeding the standard is to balance the load in each feeder to have a similar value, taking into account the shortest cable length, and install the ground wire parallel to the phase wire with a sheath voltage limiter.
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