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Reclosing transients in standard and premium efficiency induction machines in the presence of voltage unbalance

The impact of restarting an induction machine, while coasting, is investigated in this paper. When restarting a motor, high peaking currents and torque transients appear. As a result, possible damage to the rotor shaft could occur together with destabilising the power system which could lead to a fluctuating supply voltage levels. This paper investigates the restarting of two different efficiency class induction machines and analyses how a shift in phase between the supply and residual voltage affects the restarting transients. Previous studies have been carried out on standard efficiency induction machines (SEIM), however this paper aims to compare the impact of restarting on the standard and premium efficiency induction machines (PPEIM). A further contribution is made by studying the impact of restarting these machines in the presence of voltage unbalance.