大容量4回線送電線路の保安接地による誘導防護に関する研究

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In this paper, we have analyzed the protecting workers on the de-energized circuit from induction due to the live circuit and on the required current capacity of grounding conductor, for security grounding in the work site on 4-circuits large capacity power-line. We have found more suitable phase configuration for the protecting workers from induction due to the live circuit. Then we have made clear the important things to remember for the protecting workers, compared with a 1000 kV power-line. The results are as summarized below. 1. For 4-circuits large capacity power-line, the electromagnetic induction current I(m) flowing through a worker and I_0(m) flowing through the grounding conductor, both currents are more than one hundred times as the electrostatic induction currents. 2. Their exists great difference between values of I(m) and I_0(m) due to kinds of phase configuration. More suitable phase configuration is 4-circuits negative-phase-sequence, which minimize the values of I(m) and I_0(m). For this phase-sequence, the maximum values of I(m) and I_0(m) are limited about 1.5 times on 2-circuits power-line. 3. Even 4-circuits negative-phase-sequence, the maximum value of I(m), in the worke site of 1 km from the grounding point is 16.4 mA. And this value is about 3 times on 1000 kV 2-circuits power-line. Accordingly, in order that I(m) does not exceed 1 mA where is the threshold of human perception, it is necessary to provide the grounding all the working pylons. 4. Even 4-circuits negative-phase-sequence, the maximum value of I_0(m) is 82.6 A. And this value is about 2 times on 1000 kV 2-circuits power-line. But considering fault current flowing through the grounding conductor, the requiered size of one is less than a half one on 1000 kV 2-circuits power-line.
東海大学の論文

大容量4回線送電線路の保安接地による誘導防護に関する研究

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