摘要
工频电场是交流输电线路的主要环境影响因子,一般采用现场测量对其环境影响进行评价,现场测试经验表明,工频电场探头附近有人经过时会导致测量结果产生较大偏差。为研究人与探头距离对测量结果的影响程度,建立了有限元模型,模拟工频电场探头在人体影响下的测量结果。基于人体对测量过程的影响分析,提出以探头感应电荷量的变化来表征人体对测量结果的影响程度。结果表明,当人与探头间距为0.5m时,电场最大值和探头感应电荷量的测量结果畸变率分别为102.2%、12.4%;当间距为2.5 m时,两者测量值畸变率分别为3.12%、0.5%;因此,分析认为利用探头感应电荷量的变化表征人体对测量结果的影响程度较最大场强值准确度更高。
Power-frequency electric field is the main factor affecting the environment of AC transmission lines,and the environmental impact is usually evaluated by electric field measurement.Based on the practical experiences,the measurement results will cause large deviation when someone passes near the power frequency electric field probe.In order to study the magnitude of impact of the distance between man and probe on the measurement results,a FEM analysis model is developed to simulates results when the power frequency electric field probe works under the influence of human body.Based on the analysis of human body’s influence on the measurement process,a method which represents the influence of human body on the measurement results by the variation of the amount of induced charge on the probe is proposed.The results show that when the distance between human and probe is 0.5 m,the distortion rate of the measured values of the maximum electric field and the induced charge of probe is 102.2%and 12.4%,respectively;When the distance is 2.5 m,the distortion rate of the measured values is 3.12% and 0.5%,respectively.Therefore,it is suggested that the influence of human body on the measurement results be more accurate when it is described by the vary of the induced charge of probe rather than the maximum electric field.
作者
郭昆丽
秦文浩
杨昊
韩文
郭晓雪
GUO Kun-li;QIN Wen-hao;YANG Hao;HAN Wen;GUO Xiao-xue(College of Electronics and Information,Xi’an Polytechnic University,Xi’an 710048,China;State Grid Shaanxi Electric Power Research Institute,Xi’an 710054,China)
出处
《水电能源科学》
北大核心
2020年第5期163-167,共5页
Water Resources and Power
关键词
输电线路
工频电场
有限元法
探头
感应电荷量
transmission lines
power frequency electric field
finite element method
probe
induced charge
