Application of the Refined Combined Equivalent Circuit for Modeling Double-Circuit Power Lines in the Problem of Remote Fault Location

The development and improvement of mathematical models of power supply systems and their elements makes it possible to more accurately identify the location of a short circuit by remote means. This is also facilitated by the use of improved algorithms for determining the location of damage, taking into account the specifics of the industrial power supply system. The combined equivalent circuit of a power line proposed in the work takes into account the mutual and intrinsic inductance and capacitance of the conductive elements of the line, as well as the number of circuits and lightning protection cables and their relative position on the support. The article compares various models for calculating power lines and compares the results of calculations using a combined equivalent circuit, using reference data and the method of phase coordinates. The combined equivalent circuit developed by the authors provides a more accurate representation of a double-circuit power line with one and two lightning protection wires, which improves fault location, thereby increasing the stability and performance of an industrial power supply system.