USE OF LINE SURGE ARRESTERS COUPLING WITH UNDERBUILT GROUND WIRE TO IMPROVE THE LIGHTNING PERFORMANCE FOR 220kV TRANSMISSION LINES

Abstract

The use of line surge arrester on transmission lines is a method for the improvement of the lightning performance of
transmission lines. However, this method also has disadvantages such as: the high investment cost and installation many
line surge arresters lead to outage rate of line increase due line surge arrester fault. To address this problem, a new
method use of line surge arresters coupling with underbuilt ground wire (UGW) to improve the lightning performance for
220kV transmission lines, with the purpose of both reduce outage rate and reduce number of line surge arrester. The
Research results were based on the geometrical electric model (EGM) and the Electromagnetic Transients
Program/Alternative Transients Program EMTP/ATP. The outage rate of the transmission line in the different use case are
compared and evaluated. The relationship between the tower footing resistance and outage rate were also caculated
and analyzed. The absorbed energy and current of line surge arrester were also identified as the basis for line surge
arrester selection. The results obtained can be used as a practical guide for the utilities to improve the lightning
performance for transmission lines.