高精度三相电能表自动化并行校检方法研究

传统方法得到的数字功率源为周期性求解结果,未考虑实际信号在采集时的不确定性,校验结果不可靠;且校验过程复杂、效率低。为此,提出一种新的高精度三相电能表自动化并行校验方法。引入自动化并行思想,设计了一种校验表数多、精度高、速度快的高精度三相电能表校验方案。给出电流信号和电压信号采集电路设计过程,对采集信号进行放大滤波处理。给出量值溯源过程,将标准功率数据源的输出分别传至被检电能表和标准电能表。依据设计方案,通过定低频脉冲数比较法计算被检三相电能表的误差,实现高精度三相电能表的校验。实验结果表明,所提方法可行性强,在噪声干扰下仍可保证高校验性能,校验速度快。

Research on the Automated Parallel Calibration Method of High Precision Three Phase Energy Meter

The digital power source obtained by the traditional method is a periodic solution, without considering the uncertainty of the actual signal during acquisition, the verification result is not reliable, and the verification process is complicated and the efficiency is low. To this end, proposed a new high-precision three-phase power meter automatic parallel verification method. The paper introduces a kind of high-precision three-phase energy meter verification scheme with many verification tables, high precision and high speed by introducing the idea of parallelism in automation. Given the current signal and voltage signal acquisition circuit design process, the acquisition signal amplification filter. According to the design scheme, the error of the three-phase watt-hour meter to be tested is calculated by the method of comparing the number of low-frequency pulses to achieve high precision Three-phase power meter calibration. The experimental results show that the proposed method is feasible and can ensure the performance of high-school inspection under the noise interference and the verification speed is fast.