Abstract：Weak temperature stability baffles the popularization of optical current transformers (OCTs) in electric power system. A novel temperature compensation method based on comparative measurement, called comparative OCT is proposed here. Comparative OCT introduces a DC magnetic field generated by a permanent magnet as reference, and compared the AC magnetic field of primary current with the reference. Thus a final result irrelevant to temperature but only proportional to the primary current could be reached. Comparative OCT compensates Verdet constant and linear birefringence simultaneously, which are the two main factors that damage the temperature stability of OCTs. A new dual-input and dual-output sensor structure is designed to meet the special requirement of demodulation. Temperature tests of comparative OCT are carried out and the results show the compensation method based on comparative measurement is effective.
陈金玲, 李红斌, 刘延冰, 汪本进, 张明明. 一种提高光学电流互感器温度稳定性的新方法[J]. 电工技术学报, 2009, 24(4): 97-101.
Chen Jinling, Li Hongbin, Liu Yanbing, Wang Benjin, Zhang Mingming. A Novel Method to Improve the Temperature Stability of Optical Current Transformer. Transactions of China Electrotechnical Society, 2009, 24(4): 97-101.
[1] IEC60044-8. Instrument transformer-part 8: Electronic current transformer[S]. [2] Peter Menke, Thomas Bosselmann. Temperature compensation in magnetooptic AC current sensor using an intelligent AC-DC signal evaluation[J]. Journal of Lightwave Technology, 1995, 13(7): 1362-1370. [3] Ma Xianyun, Luo Chengmu. A method to eliminate birefringence of a magneto-optic AC current transducer with glass ring sensor head[J]. IEEE Transactions on Power Delivery, 1998, 13(4): 1015-1019. [4] Madden W L, Michie W C, Cruden A, et al . Temperature compensation for optical current sensors[J]. Optical Engineering, 1999, 38 (10): 1701 - 1707. [5] 刘公强, 乐志强, 沈德芳. 磁光学[M]. 上海：上海科学技术出版社, 2001. [6] Williams P A, Rose A H, Day G W, et al. Temperature dependence of the Verdet constant in several diamagnetic glass[J]. Applied Optics, 1991(30): 1176-1178. [7] 王政平, 吴强, 李庆波, 等. 线性双折射的温度特性对光学电流互感器影响的理论分析[J]. 哈尔滨工程大学学报, 2005, 26(2)：272-276. [8] 李红斌, 刘延冰. 基于比较测量法的光学电流互感器[J]. 光子学报, 2004, 33(6): 708-710. [9] 李红斌. 光学电流传感器的研究[D]. 武汉：华中科技大学, 1994. [10] 陈金玲, 李红斌, 刘延冰, 等. 比较式光学电流互感器的信号解调[J]. 电力系统自动化, 2006, 32(21): 82-85. 作者简介: 陈金玲 女, 1978年生, 博士, 讲师, 研究方向为光学电流及光学电压互感器。 李红斌 女, 1967年生, 教授, 博士生导师, 研究方向为电子式电流、电压互感器及自动化检测技术。
2009, Vol. 24 
