| 引用本文: | 李明明,王建,熊小伏,等.高温天气下架空线路运行温度与弧垂越限预警方法[J].电力系统保护与控制,2020,48(2):25-33.[点击复制] |
| LI Mingming, WANG Jian, XIONG Xiaofu, FENG Changyou, MA Chao and LIAO Zheng.Operating temperature and sag off-limit warning method for overhead transmission lines in the conditions of high-temperature weather[J].Power System Protection and Control,2020,48(2):25-33[点击复制] |
|
| 摘要: |
| 由于我国导线长期运行的最高允许温度和杆塔设计时弧垂计算所取的导线温度不一致，加上运行年限增加导致的蠕变和周围林木植被生长，夏季高温天气下重载输电线路的导线温升和弧垂越限问题不容忽视。对此，根据“电流增大→导线温度升高→弧垂增加→导线对跨越物净距减小”的电热耦合过程，提出了表征输电线路运行安全的温升裕度和净距裕度安全指标。建立了基于实况天气监测和数值天气预报的运行安全指标估计方法，提出了N-1方式下重载输电断面运行温度和弧垂越限预警方法。通过某实际输电线路因温度和弧垂越限导致触树放电的事故反演，验证了所提方法的可行性和有效性。研究结果有助于电网运行调度人员在夏季高温天气下校核架空线路的安全裕度，防范因净距不足而发生触树放电和断面潮流转移引起的连锁故障。 |
| 关键词: 架空线路 高温天气 导线温度 弧垂 风险预警 |
| DOI：10.19783/j.cnki.pspc.190296 |
| 投稿时间：2019-03-19修订日期：2019-06-23 |
| 基金项目:国家电网公司科技项目资助(SGSDDK00KJJS 1800210);国家自然科学基金项目资助(51707018) |
|
| Operating temperature and sag off-limit warning method for overhead transmission lines in the conditions of high-temperature weather |
| LI Mingming,WANG Jian,XIONG Xiaofu,FENG Changyou,MA Chao,LIAO Zheng |
| (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China;State Power Dispatching and Control Center of State Grid Corporation of China, Beijing 100032, China;Electric Power Research Institute of State Grid Chongqing Electric Power Company, Chongqing 401123, China) |
| Abstract: |
| Due to the inconsistency between the maximum allowable conductor temperature for long-term operation and the conductor temperature taken into sag calculation for the tower design, and the influence of creep caused by the increase of operation life as well as the growth of surrounding forest and vegetation, the problem of conductor temperature rise and sag off-limit of the heavy-load transmission line in summer high temperature weather cannot be ignored. For this reason, the safety indexes consist of temperature rise margin and clearance margin that represent the safe operation of transmission lines are proposed according to the electrothermal coupling process of “current increase→conductor temperature rise→sag increase→clearance distance reduce”. The estimation method of safety indexes based on weather monitoring and numerical weather forecasting is established. The operating temperature and sag off-limit warning method of the heavy-load transmission section under the N-1 operation mode is proposed. The feasibility and effectiveness of the proposed method is verified through the accident inversion of a tree-touch fault caused by the temperature and sag off-limit of a transmission line. The results can help power grid operators to check the safety margin of the overhead transmission lines in high-temperature weather of summer and prevent discharge fault caused by tree contact due to the insufficient of insolation clearance and cascading fault inducted by power flow transfer of transmission section. This work is supported by Science and Technology Project of State Grid Corporation of China (No. SGSDDK 00KJJS1800210) and National Natural Science Foundation of China (No. 51707018). |
| Key words: overhead line high temperature weather conductor temperature sag risk early warning |
