侯磊,曲锋,祁天星,刘亚洲,王伊晓,蔡毅.基于温度场分析的直流电能表计量准确度研究[J].电测与仪表,2023,60(6):188-193. houlei,qufeng,qitianxing,liuyazhou,wangyixiao,caiyi.Study on mechanism of environmental temperature affecting measurement accuracy of DC energy meter[J].Electrical Measurement & Instrumentation,2023,60(6):188-193.
基于温度场分析的直流电能表计量准确度研究
Study on mechanism of environmental temperature affecting measurement accuracy of DC energy meter
Aiming at the problem that the same design and the same batch of electric vehicle DC charging piles have different measurement accuracy in different regions, the influence of ambient temperature on the measurement accuracy of DC energy meter in DC charging piles is studied in depth. In addition to the natural temperature, the main heating devices around and inside the DC energy meter charged by the DC charging pile are the external shunt and the internal power supply chip respectively. Considering that the metering chip has the greatest influence on the metering accuracy in the internal circuit of the energy meter. The research object of this paper is the DC meter with shunt for DC charging pile. It is in high and cold areas, the environment is ultra-low temperature, and the heating of power chip inside the meter and current converter outside the meter jointly affect the DC measurement results. This paper will use finite element software to analyze the temperature distribution of DC meter environment and the temperature distribution of DC meter accessories and internal devices with large heating capacity represented by shunt, and conduct joint numerical analysis. Finally, the law of measurement results of DC electric energy meter changing with temperature in alpine region is obtained
