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| The Influence of Digital Multimeter Input Impedance in DC High Voltage Dividers Measurement |
| LIU Fang-ming1,2,XIAO Kai1,2,WANG Hai-yan1,2,LIU Hao1,2,KUANG Yi1,2 |
1.National Center for High Voltage Measurement, Wuhan,Hubei 430072, China
2.China Electric Power Research Insititute Wuhan,Hubei 430072, China |
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Abstract Voltage division and subtraction of low-voltage side was used in the DC high voltage dividers measurement.It was generelly assumed that digital multimeter imput impedance has certain effects on the measurement,so far the assuming was lack of theory basis and experimental datas.To prove the assuming, an experiment is carried out and sereval valuable data is presented.Further more,an impact factor of the measurment effect is given out by building the methemetical model, and a revised method is proposed to amend the measurment.The contrast experiment proves that the bias of corrected result is better than 0.01%.
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Received: 10 December 2021
Published: 18 May 2023
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2023, Vol. 44 
