KOBLINGSANORDNING TIL SLUTNING AV EN FJERNMATNINGSSLOEYFE FOR EN FJERNMATNINGSINNRETNING

摘要

A protective device for closing a remote feed loop of a remote fed device which automatically operates with interruptions and shorts occurring in the power supplies and wherein the power supplies direct current series feed and a relay with a relay contact closes the remote feed loop in the shunt arm of the circuit. With a particular circuit arrangement the voltage drop across the relay will be reduced by the invention and this is accomplished by using two partial windings connected in series relative to each other with one of the partial windings carrying remote feed current such that premagnetization of the relay occurs and wherein the shunt arm is connected to the point of connection of the two partial windings and the circuit results in that the maximum distance and number of power user stations can be utilized since minimum voltage drop occurs across the relay.