Abstract
One of the most important tasks in remote fault location in a 110 kV+ network is modeling the power lines taking into account the electromagnetic and electrostatic interaction of their conductive elements. A common approach is to use the mathematical models recommended by the guidelines for calculating short-circuit currents for relay protection. However, these models of power transmission lines take into account the geometric mean distance between the wires and the lightning protection cables, which means they average the values of the mutual induction impedances. In cases where wires and cables are located asymmetrically relative to each other, this leads to an overestimation of the zero-sequence impedance of power lines and, as a consequence, to an underestimation of the single-phase short-circuit current. This situation can affect the results of remote fault location. To eliminate this drawback, the article proposes a combined equivalent circuit for a single-circuit power transmission line with two lightning protection cables, based on a combination of methods of phase coordinates and symmetric components. The given equivalent circuit of power transmission lines allows calcula¬ting the mode parameters using the method of symmetric components and, at the same time, simulating those of interest for calculating power lines using phase coordinates.
Highlights
Введение Решение таких задач, как дистанционное определение места повреждения при однофазных коротких замыканиях в сети с эффективно заземленной нейтралью, требует высокой точности результатов расчета параметров аварийного режима
В работах [11, 12] авторы привели описание математической модели энергосистемы, в том числе модели многофазной ЛЭП, предназначенной для расчета и анализа параметров симметричных и несимметричных режимов
A common approach is to use the mathematical models recommended by the guidelines for calculating short-circuit currents for relay protection
Summary
Для моделирования одноцепной ЛЭП с двумя грозозащитными тросами в работе использован метод фазных координат. В соответствии с ним сопротивление проводящих элементов и их взаимоиндукции может быть представлено в виде матрицы 5×5:. Где Ż AA, Ż BB, Ż CC – собственные сопротивления фаз ЛЭП; Ż T1T1, Ż T2T2 – собственные сопротивления грозозащитных тросов; остальные элементы – сопротивления взаимоиндукции между фазами, фазой и тросом, а также грозозащитными тросами. Собственные сопротивления фаз либо тросов Ż L, а также сопротивления взаимоиндукции Ż M определяются по известным выражениям из [1]:
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