Analysis of synchronous machine transient tests using a minicomputer

A machine test system is described which provides convenient analytical facilities applicable to any transient test involving measured waveforms consisting of mixtures of exponentially time-varying a.c. and d.c. components. The analysis of a sudden 3-phase short circuit of a synchronous machine is used to illustrate the analysis procedure and the results are shown to be more accurate and consistent than those derived using traditional techniques. The accuracy of analysis is examined using synthesised test data.