Analysis of Electrical Shock Hazard Caused by Coupling Effects in Parallel High Voltage Power Lines.

What is it about?

The development of power networks encounters numerous problems. On one hand, they result from the high cost of land lots and difficulties in acquiring them from the proprietors. On the other hand, there are technical obstacles related to the constructing lines between new power sources (e.g. wind farms) and power systems. Wind farms are frequently localised in areas where the power network is poorly developed. These difficulties necessitate specific ways in which wind farms can be connected with the existing power systems. One of them lies in locating new lines within the existing line right of way. Owing to the electromagnetic impact between the lines such solutions are not frequent. Too long close-proximity sections are avoided to reduce the consequences this impact. This study is devoted to the influence of high-voltage transmission lines on other power lines. The localisation options in a 400 kV line right of way are analysed. The construction process and further exploitation of a 110 kV line in normal and short-circuit conditions of a 400 kV line are presented. The prospective touch voltages and body currents are determined for these conditions.

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Why is it important?

In the authors' opinion, high-voltage lines can be built and exploited in the right of way of other high-voltage lines, but this requires special safety measures. Owing to the prospective electric shock hazard all works connected with the erection and exploitation of such lines should be performed only with the existing lines switched off. Otherwise, the live voltage work technology can be applied. The presented research methodology can be used for analysing electric shock hazard when there is a proximity of lines of rated voltages different than those analysed.