摘要
±800 kV/±500 kV混压双回直流输电线路可解决中国日益增长的电力需求和输电走廊资源紧缺的矛盾,但目前尚无建造和运行经验,研究其电磁环境具有重要工程指导意义。文中采用解析法、CISPR和BPA经验公式法等方法,计算了两种基本塔型及相应导线布置方式下的导线和地线表面场强、地面电场和离子流密度分布、线路最小对地距离和走廊宽度、可听噪声和无线电干扰等电磁环境相关指标,分析了不同因素(导线排列方式、导线高度、线间距离等)对电磁环境的影响,并与±800 kV直流单回线路和±500 kV直流双回线路的电磁环境进行了对比。结果表明,±800 kV/±500 kV混压双回线路在选择合适的塔型及导线布置方式下可基本满足电磁环境要求,且改变相应的线路参数能有效改善其电磁环境问题。
For understanding the electromagnetic environment of the ±800 kV/±500 kV double-circuit DC transmission lines on the same tower, analytic method as well as CISPR and BPA empirical formulas are employed to calculate the electromagnetic environment indexes of two basic tower types with respective conductor arrangement, including surface field gradient of conductor and ground wire, distributions of total electric field and ion current density at ground, audible noise and radio interference strength, minimum distance to ground, and line corridor width. The effects of such factors as conductor arrangements, line height and conductor spacing on electromagnetic environment are analyzed, and the results are compared with those of ±800 kV single-circuit transmission line and ±500 kV double-circuit transmission line. It is concluded that the ±800 kV/±500 kV double-circuit transmission lines can meet the requirements for electromagnetic environment if proper tower type and conductor configuration are selected, and changing some parameters of the lines can effectively improve the electromagnetic environment.
出处
《高压电器》
CAS
CSCD
北大核心
2016年第9期26-33,共8页
High Voltage Apparatus
基金
国家自然科学基金(51477120)
国家重点基础研究发展计划(973计划)(2011CB209404)~~
关键词
直流输电线路
同塔混压
解析法
电磁环境
影响因素
DC transmission line
mixed-voltage lines on the same tower
analytic method
electromagnetic environment
influencing factors
