Abstract：Compared with fiber optical current transformer (FOCT), shunt-type DC current transformers exhibit advantages of simpler structure, higher temperature stability, and better cost- effectiveness. However, in DC power transmission system applications, they face the challenge of balancing small current measurement accuracy with a wide dynamic range. This paper proposes a signal processing method based on dual-range independent analog-to-digital converter (ADC) sampling technology, which enhances measurement accuracy through a high-precision differential conditioning circuit. The primary-auxiliary dual ADC architecture achieves 0.2% error at 10% rated current while maintaining a 15 times rated current dynamic range. An intelligent switching algorithm with a hysteresis threshold prevents range oscillations. Experimental validation result shows that the prototype maintains an error meeting the Class 0.2 requirement of the IEC 61869-14 standard within the ±5 000 A range.
张宇驰, 李少东, 卢为, 赵森林, 朱何荣. 分流器型直流电流互感器信号处理系统研究[J]. 电气技术, 2026, 27(6): 66-71.
ZHANG Yuchi, LI Shaodong, LU Wei, ZHAO Senlin, ZHU Herong. Research on shunt-type DC current transformer signal processing system. Electrical Engineering, 2026, 27(6): 66-71.
2026, Vol. 27 
