Abstract
Aiming at the problem of fault location for offshore DC cables, this paper analyses the reasons why the double-ended method is more accurate than the single-ended method in DC transmission lines. We point out that the error in fault location on DC cables using the double-ended method mainly comes from the fact that the difference in wave speed between different segments is ignored. Therefore, based on the traditional double-ended method, this paper proposes an improved double-ended traveling wave ranging method which considers the difference in wave velocity and the actual situation of offshore cables connected in sections using flexible joint technology.
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