交直流输电线路混合电场的人体感受试验及设计控制值研究

Study on Human Perception Experiments and Design Limits of the Hybrid Electric Field of Parallel HVAC and HVDC Transmission Lines

交直流输电线路同走廊和同塔架设是随着我国电网技术发展而出现的新输电方式,国内外尚无相应的交直流混合电场设计控制值标准。因此,设计同走廊和同塔架设的交直流输电线路时,导线对地高度和走廊宽度的选取面临无据可依的难题。该文提出确定交直流混合电场设计控制值的原则;开展不同交流(工频)电场和直流电场组合下的人体直接感受和暂态电击感受试验;通过对试验结果的统计分析,获得不同概率下人体不出现明显感受时的交流(工频)电场和直流电场关系曲线;在此基础上,得出确定交直流输电线路混合电场设计控制值的公式。该研究可为同走廊和同塔架设交直流输电线路设计中交直流混合电场的控制提供一定技术支撑。

With the development of power grid in China,it is an optimized transmission configuration to lay parallel HVAC and HVDC lines in an adjacent corridor or on a same tower.However,the corresponding design standard to limit the hybrid electric field of the transmission lines,which is the basis to design the height of the conductors to ground and the width of the corridor,has not been proposed.The principles to determine the limit of hybrid electric field are discussed and recommended.Then,two types of human perception,head hair perception and spark discharge perception,are measured under hybrid electric field with different DC and AC(power frequency)components.According to the statistical results of the experiment data,the relationship curves between AC(power frequency)electric field and DC electric field are derived when the human sensation is acceptable under some certain probabilities.Based on these curves,the formulas to calculate the design limit of the hybrid electric field are obtained.The results in the research can provide technical support to control the hybrid electric field for design of the parallel HVAC and HVDC transmission lines.