Assessment of surge arrester failure rate and application studies in Hellenic high voltage transmission lines
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- 作者：C.A. Christodoulou ; L. Ekonomou ; G.P. Fotis ; I.F. Gonos ; I.A. Stathopulos
- 关键词：Surge arresters ; Backflashover ; Ground flash density ; Lightning performance ; Lightning protection ; Optical transient density ; Overhead transmission lines ; Shielding failures
- 刊名：Electric Power Systems Research
- 出版年：2010
- 出版时间：February 2010
- 年：2010
- 卷：80
- 期：2
- 页码：176-183
- 全文大小：593 K
文摘
The use of transmission line surge arresters to improve the lightning performance of transmission lines is becoming more common. Especially in areas with high soil resistivity and ground flash density, surge arresters constitute the most effective protection mean. In this paper a methodology for assessing the surge arrester failure rate based on the electrogeometrical model is presented. Critical currents that exceed arresters rated energy stress were estimated by the use of a simulation tool. The methodology is applied on operating Hellenic transmission lines of 150 kV. Several case studies are analyzed by installing surge arresters on different intervals, in relation to the region's tower footing resistance and the ground flash density. The obtained results are compared with real records of outage rate showing the effectiveness of the surge arresters in the reduction of the recorded failure rate. The presented methodology can be proved valuable to the studies of electric power systems designers intending in a more effective lightning protection, reducing the operational costs and providing continuity of service.