特殊螺旋高双折射保椭圆光纤研究及其在电流互感器中的应用  

Special Spun High Birefringence Elliptical Polarization-maintaining Fiber and Its Application in Current Sensor

作　　者：刘建明[1] 黄勇 

机构地区：[1]国家电网公司,北京市西城区100031 [2]上海康阔光传感技术股份有限公司,上海市浦东新区201210

出　　处：《中国电机工程学报》2017年第12期3621-3626,共6页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2013AA050101)~~

摘　　要：光纤电流传感器在电力电流测量领域具有广泛的应用潜力,其中电流传感光纤的性能是制约光纤电流传感器稳定性的关键因素。针对当前构成电流传感光纤的主要组成部分光纤波片与传感光纤存在性能一致性与稳定性差的问题,设计并制作了一种特殊螺旋高双折射保椭圆光纤用作电流传感光纤,可以有效地解决电流传感光纤存在的这些问题。先介绍该特殊光纤的结构,根据耦合模理论对其传感功能、抗干扰能力进行了理论分析。利用该光纤研制了光纤电流传感器,并对其测量精度、抗振动特性等进行了检测。测试结果表明,该光纤电流传感器采用40m/s^2加速度持续振动的8h内,电流传感器测量比差保持在±0.05%,具有较强的抗干扰能力;在-40℃~70℃的温度范围内以及额定1200A的测量电流下,测量比差与相差分别在±0.05%与±1′以内;在频率为0~1500Hz内的测试电流下,电流传感的精度在±0.2%以内。采用该特殊螺旋高双折射光纤所制作的高精度和高稳定性光纤电流传感器,在±800k V灵州换流站成功挂网运行。The performance of sensing optical fiber plays a key role in maintaining the stability of a fiber optical current sensor （FOCS）. In order to overcome the impact of the random birefringent, a special spun high birefringence elliptical polarization-maintaining fiber was fabricated and applied to design a FOCS sensing coil. The structure and working mechanism of the sensing fiber were described, and the ability of anti-interference was analyzed. At a rated current of 1200 A, over a temperature range from 40℃ to 70℃ the sensor was tested and achieved a high accuracy. The amplitude measuring error was lower than 0.05% and the phase measuring error was within ±2＇ respectively; when the frequency of current measured was between 0Hz and 1500Hz, the amplitude measuring error was within 0.2%. During eight hours, of vibration at 40m/s2, the amplitude measuring error was always kept within ±0.05%, and the phase measuring error was always kept within 2＇. The FOCS achieved by the special optical fiber is put into operation in the 800kV Ling Zhou Convertor Station.

关 键 词：光纤电流互感器 法拉第效应 电流测量 特殊螺旋双折射光纤 抗干扰 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]