Analysis on Mechanical Characteristics of the Main Transformer Bushing End in UHV Substation under Wind Load
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摘要: 以某特高压变电站主变套管端部为研究对象，以Abaqus软件为平台，建立引跨线及主变套管端部精细化有限元模型，分析了风向、风速对套管端部力学性能的影响。结果表明：主变套管端部的端子板及接线柱应力和位移较大，为结构的薄弱环节；各零件上应力及位移随风向出现周期性变化，90°风向为最不利风向角，90°及270°风向角时有峰值，交变应力作用下零件将发生疲劳破坏；风速较小时，接线柱和端子板应力及位移变化较小，风速超过12.65 m/s后，随风速增加应力和位移均表现为非线性急剧增加，局部应力超过了屈服极限。Abstract: In the natural environment, the main transformer bushing terminal in an ultra high voltage substation is prone to deformation, fracture and other problems caused by the wind. Taking the main transformer bushing terminal as the research object, the Abaqus software is adopted as the platform for building a refined finite element model for the transmission line, down conductor and the main transformer bushing terminal, and the influence of wind direction and wind speed on the mechanical properties of the bushing terminal is analyzed. The results show that the terminal board and bushing terminal have large stresses and displacements, which are the weak links of the structure. The stress and displacement of each part change periodically with the wind direction. The 90° wind direction is the most unfavorable wind direction angle, and there are peaks at 90° and 270° wind direction angles, and these parts will have fatigue damage under the action of alternating stress. When the wind speed is low, the stress and displacement of the bushing terminal and terminal board change little; but when the wind speed exceeds 12.65 m/s, the stress and displacement of the bushing terminal and terminal board show a nonlinear sharp increase with wind speed, and the local stress exceeds the yield limit. The research results provide a reference for the design, improvement and optimization of the same type of the substation and transformer bushing terminal under the same environment.
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Key words:
- main transformer bushing end /
- wind load /
- mechanical properties /
- finite element
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表 1 主变套管端部各零件材料属性
零件名称 材料 弹性模
量/GPa泊松比 屈服强
度/MPa密度/
(kg·m–3）引下线 铝合金 50 0.33 − 2356 端子板 黄铜 110 0.32 100 8500 接线柱 紫铜 110 0.34 80 8963 线夹、间隔棒、套筒 铝合金 70 0.33 60 2650 端盖、法兰、外罩 钢 205 0.3 235 7850 
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表 2 风速25.3 m/s时，不同风向角零件应力计算结果
风向角 最大应力/MPa 对比点应力/MPa 接线柱 端子板 端盖 套筒 1 2 3 4 0 44 107 24 4 88 16 20 35 45° 134 176 35 15 75 173 121 12 90° 209 354 73 26 131 276 200 36 135° 180 300 65 23 116 258 174 63 180° 80 147 26 9 31 122 51 61 225° 111 200 30 13 97 70 89 22 270° 184 321 61 24 185 139 165 23 315° 148 228 47 20 175 109 133 44
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