Apparat til kompensering af jordstrømme forbundet med faseledere i et distributionssystem

摘要

The apparatus represents a controlled current source (1) that is connected in-between phase conductors of the transformer (3) of the distribution system and the earth potential. It works not only as a compensator of ground fault currents and higher harmonics of ground fault currents at the point of the ground fault (2) but is also used for compensating for phase non-symmetry during a trouble-free state of the distribution system. The function of a controlled current source (1) may be performed for example by a multi-phase power electronics converter, or a controlled current source (1) can be composed of single-phase power electronics converters. For example, a voltage source inverter, current source inventer or frequency converter can be used as a controlled current source (1).