Fault Location for Multi-Terminal Mixed Lines with Shared Tower and Different Voltage levels

What is it about?

This paper presents a new fault location algorithm for multiple-circuit shared tower transmission lines with different voltages utilising synchronised measurements. The untransposition of the lines and the mutual coupling between the parallel lines are considered. Kirchhoff’s current law (KCL) and fault location equation are used to identify the faulty section and obtain the location of all normal shunt faults and inter-circuit faults. The power system is simulated with DIgSILENT Power Factory software and all calculations are performed by MATLAB.

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Why is it important?

Current fault location techniques are not applicable for multi-terminal multiple-circuit parallel overhead lines with different voltage levels. The author has found that only one research paper discussed fault location for partial coupling multiple-circuit parallel overhead lines with same tower at two different voltage levels.