A device, designed for the connection of a load between a phase conductor and a neutral wire in a three-phase net and which automatically switches the load to a faultless phase conductor in the three-phase net during a phase conductor error

摘要

In order to automatically switch a single-phase load (B) to a subsequent phase in a three-phase net during a phase error, we propose a device that has sensor relay (R1, R2, R3) connected between each phase conductor (L1, L2, L3) and the neutral wire (0). The sensor relay is activated in a given sequence. The first two relays in the sequence (R2, R1) are set to interrupt the sensor circuit for the subsequent sensor relay. Each sensor relay is assigned a connection relay (R4, R5, R6) with connection contacts (K10, K14, K8; K11, K12, K3; K9) in order to close a supply circuit from the selected phase conductors via the load to the neutral wire.IMAGE