Tolerance design based on branch-and-bound method for metering circuit of electrical energy meter

According to its requirements for high metering accuracy, a basic measuring error consistency model for a batch of single-phase intelligent electrical energy meter is established and the corresponding optimization objective and constraint of its tolerance design are proposed. A tolerance design method for discrete design variables is proposed based on the concept of integer linear programming and the tolerance design of metering circuit for a type of single-phase intelligent electrical energy meter is optimized with the production cost as the objective and the range of measuring error as the constraint. The corresponding component tolerance grades and production costs are obtained by setting different error ranges. The optimization results show that, the proposed method controls the measuring error range while efficiently minimizes the cost, suitable for the tolerance design of single-phase intelligent electrical energy meter.