| 引用本文: | 李传生,张春熹,王夏霄,于 佳,冯秀娟.Sagnac型光纤电流互感器变比温度误差分析与补偿[J].电力自动化设备,2012,32(11): |
| LI Chuansheng,ZHANG Chunx,WANG Xiaxiao,YU Jia,FENG Xiujuan.Analysis and compensation of ratio temperature error for Sagnac fiber-optic current transformer[J].Electric Power Automation Equipment,2012,32(11): |
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| 摘要: |
| 为提高互感器的测量准确度，基于光路系统的琼斯矩阵模型，推导出了互感器归一化变比的数学表达式，并对其中的温度敏感参数进行了分析，结果表明：圆双折射不产生变比误差，足够大的圆双折射可以抑制线性双折射随温度变化造成的变比误差；相位延迟和温度系数满足一定条件的1／4波片，可以减小Verdet常数随温度变化造成的变比误差。通过螺旋缠绕传感光纤引入圆双折射来抑制线性双折射的影响，并对互感器的变比按敏感头的温度进行分段线性差值补偿，减小了变比误差。实验结果表明：在-30 ~ 70 ℃范围内，补偿前后互感器的变比误差由0.84 % 减小到0.22 %，验证了补偿方法的适用性和有效性。 |
| 关键词: 光纤电流互感器 变比 双折射 线性插值 误差补偿 误差分析 |
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| Analysis and compensation of ratio temperature error for Sagnac fiber-optic current transformer |
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LI Chuansheng, ZHANG Chunx, WANG Xiaxiao, YU Jia, FENG Xiujuan
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School of Instrument Science and Opto-electronics Engineering，Beihang University，Beijing 100191，China
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| Abstract: |
| In order to improve the measurement accuracy of the current transformer，the normalized math expression of transformer ratio is deduced based on the Jones matrix model of optical system and its parameters sensitive to temperature are analyzed. Results demonstrate that：circular birefringence may not introduce ratio error and it，when big enough，can restrain the ratio temperature error caused by linear birefringence；quarter retarder，when its phase retardation and temperature coefficient satisfy certain conditions，may reduce the ratio temperature error caused by Verdet constant. The ratio temperature error is decreased by the spiral winding of sensing fiber to suppress the effect of linear birefringence and by the sectional compensation of linear interpolation according to the temperature of sensor head. Test results show the ratio error is decreased from 0.84 % to 0.22 % when temperature varies from - 30 ℃ to 70 ℃，which verifies the applicability and validity of the proposed compensation method. |
| Key words: fiber-optic current transformer ratio birefringence linear interpolation error compensation error analysis |
