Live — Line surge arrester installing on a mountain section of the 400 kV Gutinas-Brasov o/h line (between towers 94–100)

摘要

The 400 kV GutinasBrasov o/h line is located in a mountain area with rocky soil. Because of the thick ice covering the conductors, during the winter times, causing the shieldwire breaking, the shieldwires were dismantled in the sections 94100 and 130145, long time ago. Without the shielding screen of the shieldwires those sections were left open to be struck by lightning. To reduce the lightning impact surge arresters were installed in two stages, the 2006 one, for the section 130145 and the second one in 2013, for the section 94100. Based on the first stage experience numerous improvements were applied for the second stage. No more lightning caused outages were recorded from the date of the first stage finalizing (20062016). Compared to the previous outage situation stating 410 outages per year, a very clear conclusion was drawn: a performant solution to protect the lines without shieldwires against the lightning strikes. Some improvements were proposed to the arrester manufacturer to increase the arrester component safety.