基于高精度数字积分方法的组合型电子式互感器

针对传统的互感器存在的易饱和、动态测量范围小、测量频带窄等缺点,提出了一种新型的组合型电子式互感器,其绝缘结构采用倒立式SF_6互感器绝缘结构,传感器采用Rogowski线圈和圆柱形同轴电容器,积分环节采用改进的数字积分方法,有效提高了互感器的可靠性和准确性。仿真结果及测试结果表明,该新型组合型电子式互感器测量准确度高,满足0.2S级及0.2级测量要求;与单一功能互感器相比,仅需一个绝缘本体即可实现电压电流的同时测量,具有占地面积小、成本低等优点。

Combined electronic transformer based on high accuracy digital integration method

Aiming at shortcomings of traditional transformers, such as being easily saturated, small dynamic measurement range and narrow measuring band, a novel combined electronic transformer is proposed. The insulating structure of inverted SF6 transformer is adopted, the Rogowski coil and cylindrical coaxial capacitor are used as the sensors and the improved digital integral method is adopted in the integral link, which effectively improve the reliability and accuracy of the proposed transformer. The simulative and test results show that the proposed transformer has high accuracy and meets the requirements of 0.2S and 0.2 accuracy level, and compared with the single-function transformers, it only needs one insulation body to achieve simultaneous measurement of voltage and current, so it has the advantages of small size and low cost.