基于拉力值的不同电压等级避雷线融冰进程、脱冰瞬间阈值识别研究OA

In view of the current situation that there is no effective identification of the ice melting process of the lightning conductor,and the lightning conductor is more likely to break due to icing than other phase lines,the author uses the real-time tension monitoring value of the lightning conductor during the ice melting process,in order to overcome the influence of different models and span on the reference va-lue of tension,and comprehensively consider the variation characteristics of horizontal stress,vertical span and vertical load in the ice melting process,establishes the ice weight calculation model per unit length.Combined with the actual monitoring ice melting tension value of 200 lightning lines as sample data,the ice weight change rate per unit length and the probability distribution of ice weight change at the moment of deicing of 110,220 and 500 kV lightning lines are studied.Research shows that the threshold values for the rate of ice weight change per unit length during the de icing process of lightning rods with different voltage levels are-0.035,-0.049,and-0.072 kg/10 min,respectively,with probabilities of 89.26％,88.04％,and 90.13％;The threshold values of ice weight per unit length at the moment of deicing of lightning wires with different voltage levels are 6.51,8.22 and 10.26 kg respectively,and the probability is 91.16％,89.72％and 88.17％respectively;An actual case is used to verify the accuracy of the calculation results in this paper.The conclusions can provide scientific guidance for the effective identification of lightning conductor ice melting process and anti-ice reinforcement engineering.