What Happens When Ane Stage Is Opened Inwards A Star-Delta Transformer?

             This mightiness hold upwards possible inwards substations piece whatsoever L-G error occurs inwards the transmission side.

               Let us regard a star delta transformer amongst a top dog delta connexion too secondary star connection.  The occupation voltage is V across the ii phases.

                If whatsoever relay operates due to whatsoever error too the stage B gets opened then, the electrical flow incoming to stage B volition hold upwards zero.

                As nosotros tin encounter from the higher upwards diagram the B stage is disconnected.  After this nosotros tin encounter a unopen loop formation too circulating electrical flow passes through coils inwards betwixt phases RB too BY.  Thus the voltage is divided betwixt the ii phases too V/2 appears on the secondary side.  This voltage partition is clearly mentioned inwards the higher upwards diagram.

                  This province of affairs leads to whatsoever three stage equipment volition perish on to locomote at reduced efficiency.  Motors would hold upwards noisy too would overheat leading to decreased efficiency.  Induction motor acts equally unmarried stage motor amongst reduced efficiency.  This occupation is mutual inwards sub stations too is got rid past times minimising the circuit error clearance time.

                  This tin equally good hold upwards cleared using unmarried phasing protection relay.  To encounter to a greater extent than nearly transformer rating concept click here.

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