Abstract
A piecewise-linear model is used to describe ferroresonance. The paper is concerned with the determination of the minimum voltage V min to sustain ferroresonance. An exact expression for V min cannot be derived owing to the transcendental character of the steady-state equations. By writing equations in an intermediate linear form, the determination of exact values for V min is substantially simplified. Based on the linear form, the authors also obtain expressions providing almost exact and approximate values for V min. As an application the authors find exact, almost exact, and approximate values for the capacitance (i.e. the cable length) beyond which ferroresonance can be expected.
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