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ABSTRACT
The bus transfer schemes are provided in emergency switchgears feeding critical duty auxilary loads in process plants and thermal/nuclear power plants. During the time of bus transfer, group of such loads gets isolated from power supply. Transient residual voltage analysis of such loads, mainly consisting of induction motors loads, plays a vital role in deciding the transfer scheme. This paper reviews some of the existing machine models and solution techniques suggested for predicting the voltage transients during isolated operation of induction motors and reports a new solution algorithm based on a non iterative scheme for the multimachine case. The new solution scheme is found to be more reliable and faster than the existing scheme. The theoretical results using various models have been compared for single as well as multimachine cases. The practical validity of various models have been studied by comparing the theoretical results with actual test results obtained in laboratory.