Abstract
High voltage direct current transmission has the advantages of high transmission capacity, low loss, no simultaneous operation of the AC system on both sides, and small loss on the power grid in case of failure. The stability of synchronous operation does not limit its transmission capacity and distance, while avoiding the effects caused by low frequency oscillations. And, in the event of a blackout, it won’t cause massive power outages either, reducing losses. The DC transmission system may withstand both normal working DC high voltage and polarity reversal voltage, so it is extremely necessary to conduct theoretical analysis of the DC cable terminal under polarity reversal voltage. This article simulates the distribution of the electric field at the reverse polarity voltage of a DC cable terminal and analyzes its law of variation. The results show that when the conductivity of the main insulation to the reinforced insulation is equal to its dielectric permittivity ratio, the build-up of space charges can be effectively inhibited and guide relevant studies.
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