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Simple compact models of overhead lines and metal sheathed/screened cables are suggested for the analysis of earth-fault currents and voltages. Models for nonuniform lines and lines combined with cables are also developed. The models proposed make it possible to compose relatively simple expressions for calculating the earth-electrode voltages and currents of faulted substations, and for assessing the enhancements which can be achieved by using a nonuniform line or a combined line supply.
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J. Nahman (2001) studied this question.
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