یک ارزیابی عملی بر روی جای گذاری برقگیرها

یک ارزیابی عملی بر روی جای گذاری برقگیرها

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یک ارزیابی عملی بر روی جای گذاری برقگیرها

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یک ارزیابی عملی بر روی جای گذاری برقگیرها

A Practical Evaluation of Surge Arrester Placement for Transmission Line Lightning Protection

Abstract

The use of metal–oxide varistor surge arresters (MOVs) in lightning protection of overhead transmission lines to improve reliability is of great interest to electric utilities. However due to economic reasons, it is not possible to completely equip an overhead transmission line with surge arresters at each transmission
structure. In this paper, an evaluation of lightning protection design on a 115 kV transmission line using surge arresters, utilizing a model based on field data, is presented. The model developed is used for computer simulation using the Alternative Transients Program.

Various design procedures aimed at maximizing the reliability of service on the transmission line using a minimal number of surge arresters are analyzed. Different designs considered for transmission line lightning protection using MOV arresters include: the use of a different number of surge arresters per tower, distance between towers with surge arresters and the dependence of these configurations on tower footing resistance. The lightning protection designs are analyzed using ‘lightning flashover charts,’ proposed in this paper

. Also, an analytical model of two 115 kV transmission lines in Southwest U.S. has been developed and different surge arrester location strategies used on these transmission lines have been analyzed. Practical experiences and effectiveness of various lightning protection designs used on these transmission lines are discussed.

Index Terms

Backflashover, lightning protection, overhead transmission lines, surge arresters, surge arrester location, transmission engineering.

I. LIGHTNING PROTECTION OF OVERHEAD TRANSMISSION LINES

EXPERIENCES of various utilities have proven that the use of line surge arresters is an efficient technique in
improvement of lightning performance of overhead transmission lines [1], [2]. Surge arresters avoid lightning flashovers by maintaining the voltage across insulators on a transmission line below the insulation withstand capability. In general, for transmission lines without shield wires, the use of surge arresters at every insulator location is an alternative for shield wire protection [3].

For transmission lines with shield wires, line surge arresters are used at remote locations where linemaintenance is difficult or at places of high ground resistivity (e.g., rocky terrain, sand) [4]. In contemporary transmission engineering, line surge arresters are used on several key transmission lines to improve the reliability of service.

However due to economical reasons, it may not be possible to equip the line with surge arresters at each transmission structure. These requirements motivate a study to design a strategy aimed at minimizing the number of surge arresters to achieve a desired lightning protection.

یک ارزیابی عملی بر روی جای گذاری برقگیرها

یک ارزیابی عملی بر روی جای گذاری برقگیرها

یک ارزیابی عملی بر روی جای گذاری برقگیرها