全光纤电流互感器传感机理建模分析 - 中国电机工程学报.PDFVIP

第 36 卷 第 23 期 中 国 电 机 工 程 学 报 Vol.36 No.23 Dec. 5, 2016 6560 2016 年 12 月 5 日 Proceedings of the CSEE ©2016 Chin.Soc.for Elec.Eng. DOI ：10.13334/j.0258-8013.pcsee.162023 文章编号：0258-8013 (2016) 23-6560-10 中图分类号：TM452 全光纤电流互感器传感机理建模分析 李岩松，李霞，刘君 (华北电力大学电气与电子工程学院，北京市 昌平区 102206) Mechanism Analysis and Modeling on the Sensing of Fiber-optical Current Transformers LI Yansong, LI Xia, LIU Jun (North China Electric Power University, Institute of Electrical and Electronic Engineering, Changping District, Beijing 102206, China) ABSTRACT: The measurement accuracy of all fiber current 摘要：该文针对全光纤电流互感器测量精度受各种内外部因 transformers is affected by a variety of internal and external 素影响的问题，建立全光纤电流互感器微元传感单元的分布 factors. In this paper, an infinitesimal distributed parameter 参数模型，从本质上解释传感单元中线性双折射的产生机 model of FOCT sensing unit was built and the mechanism of 理，即极化率张量对角元不相等的作用结果；并结合光电转 the linear birefringence in the sensing unit was revealed, that is, 化的数学模型得到全光纤电流互感器的开环机理，提出提高 diagonal elements of the polarization tensor are not equal. 全光纤电流互感器(fiber-optical current transformer，FOCT) Combined with the mathematical model of photoelectric 测量精度的方法：采用新型传感材料或新型传感头结构及引 conversion, the open loop mechanism of FOCT was obtained. 入反馈信号构建闭环结构。采用 COMSOL 有限元数值分析 And based on the theory above, two methods to improve the 方法，实现光场和磁场的耦合。分析双折射、被测电流、纤 measurement accuracy of FOCT were putting forward. One is by 芯折射率、光纤的弯曲半径对测量结果的影响。研究表明， using a new type of sensing materials and a new sensor head 线性双折射是由传感材料的折射率变化引起，会降低测量灵