An approach for a real time adaption of the dead time for auto-reclosing on high voltage lines was proposed. The objective was the optimal adaption of the dead time of a currently running single-phase auto-reclosing cycle by calculating the secondary arc current based on measurements. The algorithms for optimization were performed for real time application. For this purpose, the fault location plus the load currents of the parallel non-faulty conductors were measured. The measurement and the calculation of the dead time took place during the fault and the dead time period. In this way, an optimized dead time setting with regard to the actual fault location and loading conditions were achieved. This approach results to an on-line determination of a minimum necessary dead time of a successful reclosing under consideration of the fault location and prevailing loading conditions. Analytical calculations and numerical examples as well as high voltage field tests verified the results.

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