一种基于改进数字积分的高精度电流互感器在线校验系统  

A High Accuracy on-Line Calibration System for Current Transformers Based on Improved Digital Integrator

作　　者：李振华[1] 闫苏红 胡蔚中 李杨[1] 李振兴[1] 

机构地区：[1]梯级水电站运行与控制湖北省重点实验室(三峡大学),湖北省宜昌市443002

出　　处：《电网技术》2016年第3期978-984,共7页Power System Technology

基　　金：湖北省自然科学基金项目(2015CFB219)~~

摘　　要：针对传统电流互感器校验方式存在的问题,提出了一种电流互感器的高精度在线校验方法,利用钳形Rogowski线圈作为标准电流互感器,校验时无需线路停电,且大大降低了标准互感器的体积和重量。钳形Rogowski线圈的输出需要积分,针对模拟积分器存在的温度漂移、零点漂移等问题,设计了一种高精度的数字积分算法,有效提高了信号处理过程的准确度和稳定性。测试结果表明:校验系统准确度可达到0.05级,该系统可在线路带电的情况下实现对传统电流互感器或电子式电流互感器的在线校验,避免了停电造成的损失。To solve the problems of traditional calibration methods, this paper proposes a high accuracy on-line calibration method for current transformers. By using a clamp-shape Rogowski coil as the standard current transformer,the power of the line needn＇t to be interrupted when calibration,and the volume and weight of standard transformer are reduced greatly.The output signal of the clamp-shape Rogowski coil needs to be integrated,and to overcome the problems of analog integrators,which have temperature drift and zero drift, a high accuracy digital integrator is proposed,and the accuracy and stability of the signal processing circuit can be improved. Test results indicate that the accuracy of the whole calibration system can reach up to 0.05 accuracy class. The on-line calibration system can calibrate the traditional and electronic current transformers when the line is energized,which avoiding the power-off loss.

关 键 词：钳形Rogowski线圈 数字积分 电流互感器 不断电 在线校验 

分 类 号：TM452[电气工程—电器]