A PROTECTION DEVICE AND METHOD

摘要

A device for protecting, in a multiphase electric power plant, one or more objects (1) from over-currents, said objects being connected to an electric power network (5) or another equipment comprised in the electric power plant, said device comprising an over-current reducing arrangement (9), which is activatable for over-current reduction with the assistance of an arrangement (8) detecting over-current conditions. The over-current reducing arrangement comprises a plurality of electric closing means (9), first closing means (9a) thereof being connected between respective phase conductors (R, S, T) and ground (13) or otherwise another unit having a relatively low potential and at least one second closing means (9b) thereof being connected between a zero point (3) of the multiphase object (1) and ground (13) or otherwise another unit having a relatively low potential.