STARTING TRANSIENTS OF 3-PHASE SYNCHRONOUS MOTORS CONNECTED TO A SINGLE-PHASE SUPPLY

Balanced operation of three phase synchronous motors have been dealt w ith extensively in the literature. However, unbalanced operation has n ot received as much attention. One of the interesting unbalanced modes of these motors is their operation from a single phase supply. Such a mode of operation can be of special importance in remote areas where only single phase supply is available or in the case of an open circui ted single line fault. In this paper, the possibility of operating thr ee phase synchronous motors from a single phase supply through the use of a phase balancer capacitor is explored. The criteria for selecting the required phase balancer capacitor is presented, and the analysis of the behaviour of such motors during the starting process is carried out. For this purpose, a rigorous state space mathematical model has been developed. The validity of this model have been verified experime ntally.