Abstract
Since industrial power supply systems are characterized by: relatively short 110-220 kV lines, high load density and the predominance of open network sections over closed ones. And the existing models of power transmission lines and algorithms of faulty faults are focused on modeling networks of power systems and therefore do not allow to accurately determine the location of the occurrence of a short circuit in the conditions of an industrial power supply system. Therefore, it is important to improve the methods of remote WMD. Existing modeling methods do not provide sufficient accuracy of results in 110-220 kV industrial power supply networks. Therefore, it is relevant to compare the methods for modeling overhead power lines without a ground wire and with one ground wire. Three modeling methods were considered in the work: the method of symmetrical components, the method of calculation using reference data and the method of calculation using the combined equivalent circuit. Each of the considered methods has its own advantages and disadvantages. The presented combined equivalent circuit combines the advantages of the methods of phase coordinates and symmetrical components. This allows you to take into account the asymmetry of the location of the wires, as well as using this method, it is possible to calculate the support of a power transmission line of any configuration and any wires. During the calculation, an analysis was carried out on the example of two supports P110-3V + 4 without a cable and AM110-3F4 with 1 cable with different wire cross-sections. The analysis showed that the combined equivalent circuit is accurate, since when calculating the electrical parameters of power lines of a direct sequence of active and inductive resistances, I coincide with the results obtained with other methods of modeling power transmission lines. The greatest difference in the parameters of a single-circuit transmission line was obtained when using wires with a cross section of 240 mm2, the zero-sequence capacitance calculated using the combined equivalent circuit differs from that calculated by other methods by about 2 times.
Keywords
Power transmission line, single-phase short circuit, power supply system, symmetrical components, phase coordinates, replacement circuit, resistivity, capacitance, damage location determination, lightning protection cable.
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