Reducing effect of neighboring HV overhead lines on interference at single-pole automatic reclosing

In the case of a single-pole automatic reclosing, the faulty main conductor is interrupted on both sides during the dead time, which means that the current of the interrupted main conductor must flow via the neutral points of the transformers in the transmission line. This has the advantage that, despite the interruption, energy continues to be transmitted via this overhead line. The aim of this paper is to present the results of an investigation based on several measurements on the automatic reclosing process to determine the reducing effect of the neighboring overhead line system running in parallel. Since overhead lines in Germany are built normally as double lines (because of (n-1) criterion), the minimizing influence of the neighboring conductor system in operation should be taken into account when determining the interference during the dead time. If this influence is not taken into account, it is possible that cost-intensive measures will have to be implemented without justification. Since a large part of the current of the interrupted main conductor flows through the neighboring system, the induced voltage is reduced many times by this effect, e.g. as presented in this paper by a factor of tree.