Mechanics model of 10 kV two-circuit line pole and the
reinforcing effectivity of installing stay wire

ZHANG Sheng-qiang¹, WANG Jun-wu², LEI Bing-hui³,
ZHOU Xiao-ming¹, WEI Cai-meng¹, KE Wei-xin⁴, LIU Yan-qiu⁴

                                   (1. Huizhou Power Supply Bureau, Guangdong Power Grid Corporation, Huizhou 516001, China;
                                    2. Guangzhou Power Electric Technology Co., Ltd., Guangzhou 510640, China;
                                    3. Guangdong Power Grid Co., Ltd., Guangzhou 510000, China;
                                    4. Huizhou Electric Power Design Institute, Huizhou 516001, China)

Abstract: Aiming at the breaking or falling of the poles of distribution lines under violent typhoon, a theoretical research on the strengthening method by installing stay wire was presented. Firstly, a pole mechanics model of 10 kV two-circuit line pole was established. Via the mechanics analysis, considering the wind force, gravity and the stay wire tension, the internal forces and deflection of the pole, and the tensile of the stay wire were derived in analytical form. Then an engineering project was proposed to study the change of the internal forces and deflection of poles before and after being reinforced by stay wire under wind speed 45 m/s. Finally, the effect of wind speed and reinforcing location on the pole were discussed. The results indicate that installing stay wire can greatly enhance the wind capacity of the lines. The best enhancing location is at 0.5 m~0.8 m below the bottom pole arm. The research results can provide theoretical references on the design and strengthening of distribution lines.
Key words: typhoon; two-circuit line; stay wire reinforcing; mechanics analyze; pole