Abstract
The paper proposes a combined equivalent circuit for a double-circuit power line with two lightning protection cables, based on a combination of phase coordinate and symmetrical components methods. The proposed approach to modeling power transmission lines allows introduction of the mutual arrangement of conductive elements on the tower (wires and lightning protection cables), including asymmetrical relative to each other. In addition, by combining the method of phase coordinates with the method of symmetrical components, the equivalent circuit as a whole and the process of preparing the initial data are simplified. The use of a combined equivalent circuit for power transmission lines makes it possible to calculate the unbalanced mode by the method of symmetrical components, while all elements, except for high voltage transmission lines, are modeled by the parameters of direct, reverse and zero sequence, and power lines are modeled in phase coordinates. The proposed PTL model is focused on performing calculations of the parameters of the single-phase short circuit mode in the 110-220 kV network of the industrial power supply system in order to remotely locate of the line fault.
Keywords
power line, phase coordinates, symmetrical components, mutual induction, ground wire.
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