杨亚东

摘 要：输电线路覆冰灾害严重影响电力系统安全，并給国民经济带来了巨大损失。对于高海拔无人区，交通、运行维护条件极差。探索和分析该地区覆冰划分依据，对送电线路设计和防护具有重要的指导作用。收集渝东南地区大量的覆冰观测数据并结合现场覆冰调查计算结果，建立该地区覆冰厚度与海拔相对关系。结果表明，在排除微地形和微气象区的情况下，渝东南地区输电线路覆冰厚度随海拔增加变化显著。

关键词：渝东南;覆冰;海拔;划分依据

中图分类号：TM75;P429 文献标识码：A 文章编号：1003-5168（2021）34-0-03

Basis Analysis of Icing Classification for Transmission Lines in

Southeast Chongqing

YANG Yadong

（Power China Henan Electric Power Survey & Design Institute Co.， Ltd.， Zhengzhou Henan 450007）

Abstract： Transmission line icing disaster seriously affects the safety of power system，and bring huge losses to the national economy.For the high-altitude no-man’s land with extremely poor traffic and operation and maintenance conditions， it is important to explore and analyze the basis of ice division in this area for the design and protection of power transmission lines. By collecting a large number of ice cover observation data in Southeast Chongqing and combined with the calculation results of field ice cover investigation to establish the relative relationship between ice cover thickness and altitude in this area. The results show that the ice thickness of transmission lines in Southeast Chongqing and Chongqing changes significantly with the increase of altitude when the microtopography and micrometeorological areas are excluded.

Keyword： Southeast Chongqing;ice;altitude;basis of classification

近年来，随着全球气候变暖，反常、极端天气频繁发生，冰冻灾害天气次数逐渐增多，影响范围也越来越大。而输电线路会直接受到冰冻天气的影响，因覆冰引起的电网故障率也在不断增加，给国民生活及经济造成了严重危害[1]。

重庆市位于我国西南地区，而渝东南地区高压线较多。渝东南地区主要包括黔江区、彭水县、武隆区、石柱县、秀山县和酉阳县。该区域有向上、锦苏±800 kV直流等多条特、超高压输电线路，分布密集，是重要的国家电网高压线路走廊，也是重庆覆冰灾害多发区域[1]。

特殊的地形条件和气候特征，导致该区域覆冰灾害情况复杂多样，加之近几年极端天气频发，覆冰灾害呈增多趋势，严重影响了区域电网的安全稳定运行。因此，针对作为超高压、特高压线路走廊的渝东南地区进行覆冰研究，对线路设计及采取相应抗冰措施意义重大。……