The inventive method is designed for improving the protection of MV network (1) grounded through the Petersen-coil device (7) and equipped with at least one of intelligent electronic devices IEDs (6 1 ....6 n ) as a protection device for power lines. The invention is characterized in that the method comprises the step of a determination an optimal residual voltage threshold U 0TH1 by using the information from the Petersen coil controller and a step of transferring information to IEDs in order to dynamically adjust the earth-fault protection function and improve detection of high-ohmic earth-faults.
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