基于高精度数字积分方法的组合型电子式互感器
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摘要
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。
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 SF_6 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.
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 SF_6 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.
引文
[1]朱超,蒋煜,梅军,等. Rogowski线圈中积分环节的研究[J].电力自动化设备,2013,33(9):64-67.ZHU Chao,JIANG Yu,MEI Jun,et al. Research on the integration of the Rogowski coil[J]. Electric Power Automation Equipment,2013,33(9):64-67.
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[14]李振华,闫苏红,胡蔚中,等.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[J].电网技术,2016,40(3):978-984.LI Zhenhua,YAN Suhong,HU Weizhong,et al. A high accuracy on-line calibration system for current transformers based on improved digital integration[J]. Power System Technology,2016,40(3):978-984.
[15]纪哲,黄纯,周有庆,等.基于PCB平面型Rogowski线圈的电流互感器误差分析及积分器设计[J].电力自动化设备,2011,31(2):76-89.JI Zhe,HUANG Chun,ZHOU Youqing,et al. Error analysis and integrator design for planar Rogowski coil current transformer based on PCB[J]. Electric Power Automation Equipment,2011,31(2):76-89.
[16]李振华,胡蔚中,闫苏红,等.电子式电流互感器中的高精度数字积分器技术[J].高压电器,2016,52(2):42-49.LI Zhenhua,HU Weizhong,YAN Suhong,et al. High accuracy digital integrator technology for electronic current transformer[J]. High Voltage Apparatus,2016,52(2):42-49.
[17] AL-ALAOUI M A. Class of digital integrators and differentiators[J]. IET Signal Processing,2011,5(2):251-260.
[18]张明明,张艳,李红斌,等. Rogowski电流互感器的积分器技术[J].高电压技术,2004,30(9):13-16.ZHANG Mingming,ZHANG Yan,LI Hongbin,et al. Technology integrator in Rogowski current transformer[J]. High Voltage Engineering,2004,30(9):13-16.
[19]TSENG C C. Digital integrator design using recursive romberg integration rule and fractional sample delay,circuits and systems[J].IEEE International Symposium,2007,27(30):2726-2729.
[2]王小明,周有庆,彭洪海,等.基于Rogowski线圈的数字积分器的研究与设计[J].电力自动化设备,2013,33(2):155-159.WANG Xiaoming,ZHOU Youqing,PENG Honghai,et al. Research and design of digital integrator based on Rogowski coil[J]. Electric Power Automation Equipment,2013,33(2):155-159.
[3]陈应林,黄德祥.数字式电能计量系统及检定装置设计[J].电力自动化设备,2009,29(4):114-117.CHEN Yinglin,HUANG Dexiang. Digital Watt-hour metering system and verification equipment[J]. Electric Power Automation Equipment,2009,29(4):114-117.
[4]蒋汉儒,易灿江,刘华,等.新型电子式组合互感器研究[J].高压电器,2013,49(1):77-80.JIANG Hanru,YI Canjiang,Liu Hua,et al. Research on new electronic combined transformer[J]. High Voltage Apparatus,2013,49(1):77-80.
[5]任稳柱,冯建华,何红,等.用于智能型断路器的电子式电流电压组合互感器[J].高压电器,2011,47(5):1-4.REN Wenzhu,FENG Jianhua,HE Hong,et al. Electronic current and voltage combined transformer for intelligent circuit breaker[J].High Voltage Apparatus,2011,47(5):1-4.
[6]刘志恒,段雄英,廖敏夫,等.罗氏线圈电子式电流互感器积分特性研究[J].电力自动化设备,2017,37(3):191-196.LIU Zhiheng,DUAN Xiongying,LIAO Minfu,et al. Research on integral characteristic of ECT with Rogowski coil[J]. Electric Power Automation Equipment,2017,37(3):191-196.
[7]王红星,张国庆,蔡兴国,等.电容分压型电子式电压互感器研究与设计[J].电力自动化设备,2009,29(10):83-87.WANG Hongxing,ZHANG Guoqing,CAI Xingguo,et al. Research and design of electronic capacitive voltage transformer[J]. Electric Power Automation Equipment,2009,29(10):83-87.
[8]孙向飞,束洪春,周建萍,等.电磁型与电子式电流互感器传变和应涌流比较[J].电力自动化设备,2015,35(2):154-159.SUN Xiangfei,SHU Hongchun,ZHOU Jianping,et al. Comparison of sympathetic inrush transfer characteristics between electromagnetic and electronic current transformers[J]. Electric Power Automation Equipment,2015,35(2):154-159.
[9]周海滨,陈国华. 500 k V SF6电流互感器事故分析及预防措施[J].高压电器,2012,48(6):99-102.ZHOU Haibin,CHEN Guohua. Accident analysis and prevention measures of 500 kV SF6current transformer[J]. High Voltage Apparatus,2012,48(6):99-102.
[10]金辉,吴浩,李志勇,等.环境温度变化对SF6电流互感器运行性能的影响研究[J].电网与清洁能源,2017,33(12):65-69.JIN Hui,WU Hao,LI Zhiyong,et al. Research on effects of environmental temperature variation on the performance of SF6current transformer[J]. Power System and Clean Energy,2017,33(12):65-69.
[11]李洪涛,张巍,刘忠战. 220 k V组合电子式互感器原理结构及挂网试验[J].高压电器,2011,47(8):112-116.LI Hongtao,ZHANG Wei,LIU Zhongzhan. Construction principle and application test of 220 k V combined electronic transformer[J].High Voltage Apparatus,2011,47(8):112-116.
[12]杨玲君,周冬旭,徐志超.电容分压型电子电压互感器的特性研究[J].电力自动化设备,2012,32(8):71-74.YANG Lingjun,ZHOU Dongxu,XU Zhichao. Characteristics of capacitance voltage divider electronic voltage transformer[J]. Electric Power Automation Equipment,2012,32(8):71-74.
[13]宋涛.倒立式SF6同轴电容高压电子式电压互感器[J].高电压技术,2012,38(8):1917-1923.SONG Tao. Inverted SF6coaxial capacitance electronic voltage transformer for high voltage systems[J]. High Voltage Engineering,2012,38(8):1917-1923.
[14]李振华,闫苏红,胡蔚中,等.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[J].电网技术,2016,40(3):978-984.LI Zhenhua,YAN Suhong,HU Weizhong,et al. A high accuracy on-line calibration system for current transformers based on improved digital integration[J]. Power System Technology,2016,40(3):978-984.
[15]纪哲,黄纯,周有庆,等.基于PCB平面型Rogowski线圈的电流互感器误差分析及积分器设计[J].电力自动化设备,2011,31(2):76-89.JI Zhe,HUANG Chun,ZHOU Youqing,et al. Error analysis and integrator design for planar Rogowski coil current transformer based on PCB[J]. Electric Power Automation Equipment,2011,31(2):76-89.
[16]李振华,胡蔚中,闫苏红,等.电子式电流互感器中的高精度数字积分器技术[J].高压电器,2016,52(2):42-49.LI Zhenhua,HU Weizhong,YAN Suhong,et al. High accuracy digital integrator technology for electronic current transformer[J]. High Voltage Apparatus,2016,52(2):42-49.
[17] AL-ALAOUI M A. Class of digital integrators and differentiators[J]. IET Signal Processing,2011,5(2):251-260.
[18]张明明,张艳,李红斌,等. Rogowski电流互感器的积分器技术[J].高电压技术,2004,30(9):13-16.ZHANG Mingming,ZHANG Yan,LI Hongbin,et al. Technology integrator in Rogowski current transformer[J]. High Voltage Engineering,2004,30(9):13-16.
[19]TSENG C C. Digital integrator design using recursive romberg integration rule and fractional sample delay,circuits and systems[J].IEEE International Symposium,2007,27(30):2726-2729.