Определение наведенных напряжений, создаваемых трехфазными линиями электропередачи в особых режимах

Abstract

The purpose of the paper is to develop a method of computer simulation of induced voltages generated by high-voltage power lines in the modes of open phase faults and asymmetric short circuits. The study uses the methods of determining electric power system modes in phase coordinates implemented in the software package Fazonord. Air lines for various purposes running along the routes of high-voltage AC power lines are subjected to electrical and magnetic influences. Therefore, dangerous voltages may appear on the disconnected lines when they are located remotely (100 m and more) from the influencing line. To determine the levels of the induced voltages the modes of 220 kV power lines located in parallel to the 10 kV line are simulated. Calculations of voltages induced on the adjacent line are performed for the following operation modes of a transmission line: symmetric open fault of the phases A, B and C, whereas A is with the simultaneous short circuit to earth of the single phase and two phase short circuits. Consideration of different grounding methods of the line subjected to the influence showed that under some conditions the levels of the induced voltages can exceed 11 kV. The proposed method of computer simulation of electric power system modes developed at the Irkutsk state Transport University allows to determine the conditions of electrical safety when working on power and communication lines located in the areas of electromagnetic effects. The procedure is versatile and allows determination of the induced voltages on the lines exposed to electromagnetic effects in different operating modes.