用于电子式电流互感器的数字积分器

积分器是基于Rogowski线圈的电子式电流互感器中的关键环节。同模拟积分器相比，数字积分器具有更高的精度和稳定性，更适用于电子式互感器。文中主要论述了互感器用数字积分器的设计与实现，分析比较了多种积分方案；提出了根据设计精度要求，确定积分器所需最低采样率的算法；讨论了解决积分中漂移、初值及饱和问题的措施。研制了数字积分器样机，并进行了实验。实验结果验证了设计方法的有效性与实用性。

A DIGITAL INTEGRATOR FOR ELECTRONIC CURRENT TRANSDUCER

Integrator is the key element in an electronic current transducer based on Rogowski coil. Digital integrators allowing for better accuracy and higher stability are more adequate for electronic current transducer than analog ones. Tthe design and realization of a digital integrator for Rogowski current transducer are presented. Different integration schemes are compared with the ideal integrator. According to the analysis results, a method to calculate the necessary minimum sampling rate of a certain digital integrator is proposed. Techniques to deal with the drift, initialization and saturation in digital integrators are discussed. A digital integrator was developed and tested. Testing results prove the validity and practicability of the design method.