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gigamo 2018-10-16 10:12 PM

Effects of MV and HV cable capacitance on operational limits

The question of why all electric transmission and distribution circuits cannot be run underground to avoid the visual and other effects is often posed. The main argument against constructing underground systems is usually financial. But costs are not the only limitation. The basic laws of electricity limit how physically long an underground cable can be.

These limits are relatively unimportant on overhead lines but will severely limit the length of underground cable systems, especially high voltage systems. The limiting factor here is the capacitance of the cable, which is much higher than overhead lines and has a much greater effect on performance.

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