配网线路覆冰断线力学特性及加固措施分析  

Mechanical property of distribution network line breaking under icing status and reinforcement measures analysis

作　　者：张志强 黄增浩 ZHANG Zhiqiang;HUANG Zenghao(Electric Power Research Institute of China Southern Power Grid Company Limited, ProductionTechnology Support Center,Guang Zhou, 510663)

机构地区：[1]南方电网科学研究院有限责任公司生产技术支持中心,广东广州510663

出　　处：《电力科学与工程》2019年第3期52-58,共7页Electric Power Science and Engineering

摘　　要：考虑10 kV线路在不同覆冰厚度下发生单相断线故障可能引发的次生事故,在ANSYS软件中分别建立了杆线体系耦合模型和电杆非线性实体模型,研究在不同覆冰厚度下发生断线时,线路的动态特性及电杆受力分布特性,同时讨论了不同加固措施的作用效果。结果表明:断线时,杆线体系由于阻尼作用而发生振荡,经过一定时间的扰动后趋于平衡;在不考虑电杆基础发生倾覆的状态下,无冰和10 mm覆冰断线,并不会对电杆造成强度破坏,20 mm覆冰时,电杆发生轻微断裂,实际中应采取有效措施避免电杆发生断裂危险;通过调整基础埋深和拉线位置,可显著改变电杆的受力分布和基础倾覆力矩,进而可以有针对性的开展配网线路加固。Considering the secondary accidents that may be caused by the single-phase disconnection of 10 kV lines under different icing thicknesses, the coupling model of pole system and the nonlinear solid model of pole are established in ANSYS software respectively. The dynamic characteristics of the lines and the force distribution characteristics of poles under different icing thicknesses are studied, and the effect of different reinforcement measures is discussed at the same time. The results show that: when the wire is broken, the rod-wire system oscillates due to the damping effect and tends to balance after a certain period of disturbance;without considering the overturning of the pole foundation, non-ice and 10 mm ice-covered broken wires will not cause strength damage to the pole. When covered by the ice of 20 mm thick, the pole will break slightly. In practice, effective measures should be taken to prevent the pole from breaking. By adjusting the buried depth of the foundation and the position of the stay wire, the force distribution of the pole and the overturning moment of the foundation can be obviously changed, and then the distribution network line reinforcement can be carried out in a targeted way.

关 键 词：配网线路 覆冰断线 钢筋混泥土 有限元 

分 类 号：TM75[电气工程—电力系统及自动化]