Computer simulation of first pole-to-close multiple prestriking transients in motor systems

Multiple prestriking transients are frequently produced in systems controlled by vacuum switching devices. The authors describe solution methods for evaluating multiple prestriking transients in a source/cable/motor controlled with a vacuum switching device. A solution method based on the Fourier transform is developed. The multiple prestriking condition is simulated by the reiterative use of voltage and current generators, and the piecewise Fourier transform is used to obtain the transforms of nonanalytic functions. A method is developed for modifying the usual piecewise Fourier transform expression so that it may be rapidly evaluated by fast Fourier transform techniques