高精度Rogowski线圈电流互感器技术研究  

Research on High-Precision Technique of Rogowski Coil Current Transformer

作　　者：宋涛[1] 冯泽虎 

机构地区：[1]淄博职业学院电子电气工程学院,山东 淄博

出　　处：《仪器与设备》2019年第4期212-222,共11页Instrumentation and Equipments

基　　金：淄博市校城融合平台项目(2019ZBXC127)。

摘　　要：针对Rogowski线圈的电子式互感器其模拟器件易受温度、环境等因素影响,存在零漂、温漂的问题,本文研究了一种新型Rogowski线圈的电子式互感器,采用SF6绝缘技术,利用高压壳体与接地金属屏蔽罩的双重屏蔽作用来有效提高抗电磁干扰能力和稳定性,采用Rogowski线圈作为被测电流的计量、保护传感元件,提出了基于直流负反馈原理的改进Al-Alaoui数字积分器,能较好的抑制输入信号中直流分量的影响,改进的数字积分算法频率特性接近于理想积分器的频率特性,具有准确度高、暂态特性好的优点。试验结果显示,研制的Rogowski线圈电子式电流互感器准确度达到了0.2S级要求。According to the fact that analog devices of electronic transformer based on Rogowski coil were easily affected by temperature and other environmental factors, zero-drift and temperature-drift problems were induced. A new style of electronic transformer based on Rogowski coil was researched in this paper. The insulation structure of the new transformer was insulated by SF_6. The anti interference ability and stability was effectively improved by the double shielding of high pressure shell and grounding metallic shield cover. The Rogowski coil was applied to measure current and as protection sensing elements. The approved Al-Alaoui digital integrator based on principle of DC negative feedback was proposed, where the DC part in the input signal could by greatly inhibited. Frequency response of the improved integration algorithm was closer to that of deal integrator, with high accuracy and good transient performance. The experimental results show that the studied Electronic Current Transformer based on Rogowski coil meets the requirement of the 0.2S level.

关 键 词：ROGOWSKI线圈 电子式电流互感器 模拟积分 数字积分 直流负反馈 频率特性 

分 类 号：TM4[电气工程—电器]