The Experimental Study on the Human Body Influence on Measurement of High Voltage Power Frequency Electric Field

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.