关键词: 输电线路, 数值模拟, 冰风荷载, 脱冰动力响应, 气动力系数

Abstract: At present, research on conductor ice-shedding jumping mainly focuses on the analysis of the abrupt effects of icing loads, which only consider single icing effects, neglecting the effect of wind loads, or merely using standard wind load values in design specifications, Thus, relevant researches on de-icing dynamic responses under ice and wind loads remain in adequate. In response to this issue, this paper conducts dynamic response analysis of conductor ice-shedding and calculation research of ice jump height under ice and wind loads. Combining the simulation methods of transient dynamics and fluid dynamics, the paper calculates the aerodynamic coefficients and wind load distribution of four typical ice cover section shapes:crescent, D-shaped, fan-shaped, and elliptical. A finite element model of the conductor-insulator of the transmission line is established. The de-icing and ice-jumping processes are simulated by the concentrated load method, and the de-icing jump height and tension of the conductor under different wind attack angles and ice-covered cross-sectional shapes are calculated. The results show that under the negative lift wind attack angle, the jump height of the conductor is higher than that in the windless state, and the initial tension and the minimum dynamic tension during de-icing are higher than those in the windless state. Under the positive lift wind attack angle, the opposite is true. The ice jumping behavior of wires has different cross-sections varies, and elliptical cross-section wires experiences the maximum jumping height due to bearing higher wind loads.

Key words: transmission lines, numerical simulation, ice and wind loads, dynamic response to ice shedding, aerodynamic coefficients