Abstract
This paper reports further performance evaluation of the digital and analog fault locators reported earlier by the authors, when applied to long EHV transmission lines. For such long lines the effect of shunt capacitance must always be taken into account. The results show that both types of fault locators give less than 1.5% error due to the shunt capacitance effect for line lengths up to 100 miles and system voltages up to 400 kV. However, for lines exceeding 150 miles, the error due to the shunt capacitance factor alone is more than 3%. In addition, the paper describes the basic principles of a new type of fault locator based on the distributed parameter line model and hence suitable for long EHV transmission lines.
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