闭环全光纤电流互感器温度补偿方法研究

Research on Temperature Compensation Method of Closed Loop all Fiber Current Transformer

分析了闭环全光纤电流互感器(FOCT)的温度误差影响因素,设计了FOCT系统的温度补偿方案,完成了样机研制及全温范围(-40℃～70℃)内不同长度1/4波片和不同圈数传感环的系统性能测试。仿真结果表明,当1/4波片的相位延迟角在101°～103°范围内时,1/4波片和Verdet常数对FOCT的温度误差影响可相互抵消。试验测试结果表明,当1/4波片长度在2.4mm,即1/4波片的相位延迟角为102.86°时,FOCT的温度性能最好,和仿真结果一致。

The influence factors of temperature error of closed-loop all-fiber current transformer(FOCT)are analyzed,the temperature compensation scheme for the FOCT system is designed,the prototype development is completed,and the system performance test of 1/4 wave plate and different number of ring sensing rings with different lengths in the full temperature range(-40 ℃~70 ℃)are finished. The simulation results show that when the phase delay of the λ/4 wave plate is 101~103 degrees,the influence of the λ/4 wave plate and the Verdet constant on the temperature error of the FOCT can be counteracted. Experimental test results show that when the λ/4 plate length in 2.4 mm,namely the phase retardation of wave plate λ/4 angle is 102.86 degrees,the temperature of FOCT has a better performance,which is consistent with simulation results.