| 张哲璇,陈柏超,田翠华,陈耀军,王羽.基于混合铁心的新型电流互感器研究[J].电子测量与仪器学报,2024,38(1):9-24 |
| 基于混合铁心的新型电流互感器研究 |
| Research on a novel current transformer based on composite core |
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| DOI： |
| 中文关键词: 电流互感器 铁心饱和 电能计量 继电保护 混合铁心 磁场传感器 |
| 英文关键词:current transformer core saturation electric energy metering relaying composite core magnetic sensor |
| 基金项目:国网公司科技项目资助 |
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| Author | Institution |
| Zhang Zhexuan | 1.School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China;
2.State Key Laboratory of Power Grid Environmental Protection,Wuhan University, Wuhan 430072，China |
| Chen Baichao | 1.School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China;
2.State Key Laboratory of Power Grid Environmental Protection,Wuhan University, Wuhan 430072，China |
| Tian Cuihua | 1.School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China;
2.State Key Laboratory of Power Grid Environmental Protection,Wuhan University, Wuhan 430072，China |
| Chen Yaojun | 1.School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China;
2.State Key Laboratory of Power Grid Environmental Protection,Wuhan University, Wuhan 430072，China |
| Wang Yu | 1.School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China;
2.State Key Laboratory of Power Grid Environmental Protection,Wuhan University, Wuhan 430072，China |
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| 中文摘要: |
| 传统电流互感器铁心饱和会导致其二次电流波形发生畸变，进而可能影响电能计量的精度或引起继电保护设备错误动作，威胁电网的安全稳定运行。针对此类问题，提出了基于混合铁心的新型电流互感器(CCCT)。CCCT主要由混合铁心、二次绕组、二次电阻、磁场传感器与信号处理电路组成，其中混合铁心包含完整的内铁心与带气隙的外铁心，磁场传感器放置在外铁心的气隙中，其输出信号用于补偿发生畸变的二次电流。为验证该结构的有效性，进行了有限元仿真，制作了CCCT样机并进行了正弦交流电流、正弦半波电流、短路电流和直流电流的测量实验。有限元仿真与实验结果表明，CCCT在额定电流下的复合误差小于0.2%，稳态对称短路电流下的复合误差为2.04%，暂态短路电流下的峰值瞬时误差为4.25%，直流条件下输出与输入的拟合优度为0.999 9，既基本保留了传统电流互感器的测量精度，也具有良好的暂态响应特性与抗直流特性，可同时满足相关标准对测量、保护用电流互感器的精度要求，具备在实际工程中应用的潜力。 |
| 英文摘要: |
| Core saturation of traditional current transformers can cause distortion of the secondary current waveform, which may affect the accuracy of energy metering or cause malfunction of relay protection equipment, posing a threat to the power grid. A novel current transformer based on composite core (CCCT) is proposed to address such issue. The CCCT is mainly composed of a composite iron core, secondary winding, secondary resistance, magnetic sensor, and signal processing circuit. The composite iron core includes a complete inner iron core and an outer iron core with air gaps. The magnetic sensor is placed in the air gap of the outer iron core, and its output is used to compensate for the distorted secondary current. To verify the validity of the structure, this paper builds a finite element simulation model, makes a prototype, and carries out the measurement experiment including sinusoidal AC, sinusoidal half-wave current, short-circuit current and direct current. Results of the finite element simulation and experiment show that the composite error of the CCCT at rated current is less than 0.2%, the composite error under symmetrical steady short-circuit current is 2.04%, the peak value of instantaneous error under transient short-circuit current is 4.25%, and the goodness of fit between output and input under DC conditions is 0.999 9, which can simultaneously meet the accuracy requirements of standards for measuring current transformers and protective current transformers. Consequently, the CCCT has the potential to be applied to practical projects since it has good transient response characteristics and anti-DC characteristics while maintaining the high measurement accuracy of traditional current transformers. |
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