摘要
为了减少人体对高压电场测量造成的影响,根据电磁场理论,分析了工频电场中人体体内产生感应电流引起的场强畸变,引入电场强度增加因子,降低电场测量仪器测量值的畸变程度。给出了一个简化人体模型,采用Ansoft Maxwell软件仿真人体存在时高压工频输电线周围的电场分布情况,分析了人体对电场强度的畸变影响。进一步采用EFA300电磁场测量仪进行了人体周围的实地测量,通过数据比对测量,确定电场增加因子数值,对电场畸变进行了校正,使测量仪器的测量值是未畸变前的场强值,降低了人体存在造成的场强测量误差。特别是,消除了人体存在导致手持式电场测量设备测量畸变严重的现象,减少测量误差,提高了精度。
According to the theory of electromagnetic field,this paper analyzes the electric field distortion caused by induced current in human body conducted at industrial frequency in order to reduce the influence caused by human body on the measurement of high voltage electric field.The enhancement factor of the electric field distortion is introduced,which reduces the degree of electric field measurement distortion.Presenting a simple model of the human body,Ansoft Maxwell is used to simulate and calculate the electric field distribution when model of the human body is in direct contact with the ground under high voltage transmission lines at industrial frequency.Then the electric field distortion around human body under experiments is measured using the electromagnetic field analyzer EFA300.The enhancement factor of the electric field distortion is determined and the correction of electric field distortion is made by comparing the measurement datum,which are obtained under conditions of absence of human body and existence of human body for many times.This ensures that the measurement is the same as the electric field value before distortion,reducing the influence caused by human body to the measurement of electric field.Especially because of human existence when using handheld equipment of electric field measurement the serious phenomenon of electric field measurement distortion is eliminated,as well as measurement error is reduced and precision is improved.
出处
《电测与仪表》
北大核心
2013年第6期24-27,48,共5页
Electrical Measurement & Instrumentation
基金
国家自然科学基金资助项目(51077139)
