基于威布尔分布的电能表可靠度评价

电能表的可靠度评价是电能表质量的重要评判标准。针对当前国网信息系统中电能表可靠度评价模式比较简单、不够准确的问题,文章基于威尔布分布,结合电能表的可靠度理论,实现对实际运行电能表的批次可靠度评价。利用实际运行中电能表的批次运行数据,计算电能表不可靠度,采用最小二乘法回归计算中间参数,并确定威布尔分布的尺度参数和形状参数,实现对整个批次电能表可靠度的预测。该方法在电能表可靠度计算理论的基础上成功实现了威布尔分布理论在电能表评价中的实际应用,突破了传统方法采用实验室加速试验数据的局限性,并实现了模型的动态修正,在电能表轮换工作中具备较高的应用价值。

Reliability evaluation of electric energy meters based on Weibull distribution

The reliability evaluation of electricity meters have become an important evaluation standard of electric energy meters. Currently, the reliability evaluation model of electric energy meter in the information system of State Grid Corporation is relatively simple and inaccurate. Based on the Weibull distribution and the reliability of the meter, the paper realized the reliability evaluation of the actual running meters in batches. First, use the operation data of electric energy meter in actual operation to calculate the failure rate of the electric energy meter. The least square regression method is used to calculate the intermediate parameters, and the scale and shape parameters of Weibull distribution are determined to realize the prediction of the whole batch of electric energy meters. On the basis of the reliability calculation theory of electric energy meters, this method has successfully realized the application of Weibull distribution theory in power meter evaluation and broken through the limitation of the traditional method using laboratory accelerated test datas. And applied all the operational data of batch electric energy meters in actual operation, realized the dynamic modification of the model. This method is useful to guide the rotation of the electric energy meters.