The Optimization of an Electrical Accuracy of the AC Single Phase Electromechanical Meter using Box–Behnken Design

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Siva Visavayothin
Pichit Sukchareonpong
Suwitchaporn Witchakul


This paper presents the optimization model for an electrical accuracy of the AC single phase electromechanical meter. It is aimed to improve the electrical accuracy of the meter. Electrical accuracy of the electromechanical meter is important to the determination of electricity energy usages charged to the electricity consumers. The Response Surface Methodology, Box-Behnken Design, has been used to identify and determine the factors that affect electrical accuracy of an electromechanical meter. The experimental design starts with the identification of seven factors of interest. Eventually, four factors are proven to have effect on the electrical accuracy of an electromechanical meter. The optimal setting for each factor has been specified and the electrical accuracy has been raised to the required level.

It’s has been found that the electrical accuracy is depending on an error of meter’s disk rotation speed comparing to the specified revolution of meter. Improving the electrical accuracy can be achieved by reducing the error of meter’s disk rotation speed. The four identified factors are 1) the released screw distances to adjust electromagnetic fields, 2) the current coil diameter, 3) the winding cycles, and 4) the voltage coil winding cycles. The appropriate setting of these four selected factors can reduce errors of meter’s disk rotation speed significantly. The optimal settings for screw position 1, 2, 3 and 4 released distance levels should be -0.3, 0.2, 1 and -1, respectively. The current coil diameter level should be set at level -1. The winding cycle level should be set at level 1 and the voltage coil winding cycle level should be set at level 0.

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