SPC (statistical process control)-based electric energy meter comprehensive error process capability evaluation method and evaluation system

Abstract

The present invention relates to an SPC (statistical process control)-based electric energy meter comprehensive error process capability evaluation method. According to the method, process capabilityindexes CPK and PPK are introduced into an error analysis process; the process capability indexes of each different load error point are calculated, and weighted calculation is performed according tothe weight coefficients of different loads, and therefore, the comprehensive error monitoring index of an electric energy meter can be determined; parameters which characterize single-phase smart electric energy meter comprehensive error distribution features are researched; the distribution law of smart electric energy meter output feature parameters are calculated finally; daily verification data analysis is reinforced, and the quality of batch products is controlled. An SPC-based comprehensive quality control mechanism is built for electric energy meter comprehensive error; the SPC technology is applied to electric energy meter comprehensive error process capability evaluation; random factors and abnormal factors that affect the quality of a teaching mode can be reasonably differentiated; an electric energy meter error verification process is always in a statistically controlled state; and the error level of a metering device can be under effective control.

Description

Technical field [0001] The invention belongs to the field of electric energy measurement, in particular to an SPC-based energy meter comprehensive error process capability evaluation method and evaluation system. Background technique [0002] With the investment of automatic measurement and verification production equipment, a large number of smart electric energy meters have been quickly verified and widely used. However, the monitoring of the error of the electric energy meter still stays at the traditional monitoring level of whether the error of a single electric energy meter is exceeded. There is a lack of an effective evaluation method for the ability of the batch error process of the electric energy meter. [0003] Statistical process control (SPC) technology was first proposed by Walter A. Shewhart of American Bell Laboratories in the 1930s. It mainly uses statistical analysis methods to monitor the industrial production process, and the original data collected during the p...

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