基于测量不确定度理论的电能计量装置整体误差性能评估与控制研究

Research on overall error performance evaluation and control of electric energymetering device based on measurement uncertainty theory

电能计量装置的准确性关系贸易结算的公平公正、电网运行的经济安全。现有相关技术标准规定了电能表、互感器的误差控制要求,但对由电能表、互感器及其回路组成的电能计量装置的综合误差性能指标,尚缺乏准确量化的定义。文中以测量不确定度理论为基础,论述了不同典型条件下电能计量装置的各标准不确定度分量、合成标准不确定度以及整体扩展不确定度的计算评定方法与允许综合误差限值的确定方法,为电能计量装置综合误差性能评估,以及电能表、互感器装出前的优化组合选配提供技术依据与方法。

The accuracy of electric energy metering devices is related to the fairness and justice of the trade settlement and the economic security of power grid operation.Published relevant technical standards have specified the error control requirements of electricity meters and transformers,while there is still a lack of accurate and quantitative definition of the comprehensive error performance index for the electric energy metering devices composed of electricity meters,transformers and their circuits.Based on the measurement uncertainty theory,this paper discusses the calculation and evaluation methods of standard uncertainty component,combined standard uncertainty,and the overall expanded uncertainty of electric energy metering devices under different typical conditions and the determination methods of the allowable comprehensive error limit,which provides technical basis and method for the comprehensive error performance evaluation of electric energy metering device,as well as the optimal combination and selection of electricity meters and transformers before they are installed.