摘要
我国酸性湿沉降多发区域是重要输电密集通道或用电高负荷密度地区,如何解决酸性湿沉降引起的金具缺陷问题是输电线路运行与检修的重要课题。为此以途经广西省河池地区500 k V贵广交流同塔双回线路中的金具缺陷为研究对象,在探讨河池地区区域酸性湿沉降特征的基础上,测试分析了途经该地区输电线路的金具缺陷以及诱因。结果表明:河池地区属于典型SO42-酸性湿沉降区域,有色金属冶炼工业污染物排放是河池地区SO2的主要来源,是输电线路金具缺陷的重要诱因;缺陷金具表面镀锌层已经遭受破坏,形成了疏松的铁氧化物,金具应力载荷基本上小于200 k N;缺陷复合绝缘子的应力破坏区域均在端部密封位置,运行8 a以上的绝缘子破坏应力载荷低于180 k N。从金属防腐、线路管理、线路维护等角度提出了光纤复合绝缘子、红外紫外联用检测等防范措施,部分措施处理效果良好。这些研究成果为酸性湿沉降多发区输电线路运行提供了技术参考。
In China, the acid wet subsidence areas overlap the high load districts and intensive corridors of transmission lines, and prevention of hardware defects is the important task of the operation and maintenance on the transmission lines. Hardware defects on 500 kV transmission lines in Hechi City of Guangxi Province are the protecting research subjects of this work. Based on the features of the acid wet subsidence areas in Hechi City, hardware defects and their inducements are analyzed by several different approaches. The results show that Hechi City is the typical SO42- acid wet subsidence area, and the pollutant discharges of the nonferrous metallurgical industry is the main source of sulfur dioxide and the in- ducements of hardware defects; the zincs encasement of defect hardware is broken with loose iron oxide formed on the surface of the hardware, and stress load is under 200 kN; the stress rupture area of composite insulators is at the end fit- tings, and stress loads of the insulators with working time above 8 years is under 180 kN. This work adopts a variety of protective measures (optical fiber composite insulator, combined detection of infrared thermography and ultraviolet im- ager, etc) to reduce these defects including corrosion protection, circuit management, and the operation and maintenance of transmission lines, etc, and some measures have good reduction effects on the hardware protections. The results can provide a reference for the operation and maintenance on the transmission lines of acid wet subsidence areas.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2016年第1期223-232,共10页
High Voltage Engineering
关键词
酸性湿沉降区域
500
KV输电线路
金具缺陷
锈蚀
工业污染
防护措施
光纤复合绝缘子
acid wet subsidence areas
500 kV transmission lines
hardware defects
corrosion
industrial pollution
prevention countermeasures
optical fiber composite insulator