The method of improving the lightning resistance level of 10kV multi-circuit overhead line with parallel gap

The method of single phase same line installation of parallel gaps on a can effectively improve the lightning resistance level of 10kV overhead distribution lines. However, current related research methods only involve the effect on the lightning withstands level of 10kV single-circuit overhead lines. There are still problems in the matching of the number of parallel gaps, installation positions and discharge voltage values in multi-circuit lines. In this paper, a 10kV double-circuit overhead line lightning overvoltage simulation calculation model is established by ATP-EMTP. For multi-circuit 10kV overhead lines, the configuration method of single-phase installation parallel gap is considered, and the calculation process of the line lightning resistance level under different parallel gap installation methods is obtained. Taking double-circuit line as an example, the optimal installation method of parallel gap is obtained under inductive lightning and when lightning strikes tower top. The results provide a reference for the application of lightning protection methods for 10kV multi-circuit overhead lines.

I. Introduction

As an important connection network between transmission lines and users, the safe and stable operation of 10kV overhead lines is of great importance. The voltage level of 10kV overhead line is low, the distribution range is wide, while the lightning trip-out rate is high. Improving the lightning withstand level of 10kV overhead line comprehensively is the key to improve the stability of power system[1]-[4].