Power Frequency Electric Field Measurement and Error Analysis of under Different Humidity Conditions

Abstract

In order to study the influence of ambient humidity on power frequency electric field measurement, this paper uses SEM-600 power frequency field strength meter to measure the uniform electric field under different humidity conditions, analyzes the source of uncertainty introduced in the measurement, and evaluates the uncertainty. The results show that the electric field measurement increases with the increase of humidity. When the relative humidity is 46.7% <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\sim$</tex> 80.0% the average relative error of the measured value is −1.14% <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\sim$</tex> 4.81%. When the relative humidity is 80.0% <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\sim$</tex> 94.0%, the average relative error of the measured value is 4.81% <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\sim$</tex> 88.05%. The extended uncertainty of the electric field measurement increases with increasing humidity. When the relative humidity is 46.7%~80.0%, the average extended uncertainty is 0.12kV/m~0.13kV/m. When the relative humidity is 80.0%~94.0%, the average extended uncertainty is 0.13kV/ m~0.22kV/m. This paper provides a reference for the correction of electric field measurement results in high humidity environment, and provides a basis for reasonable evaluation of the quality of measurement results. This work is supported by the Science and Technology Project of the Headquarters of State Grid Corporation of China Research on Power Frequency Electromagnetic Field Calibration Technology (GYW1720200201).