基于光纤角度传感器的角度测量技术研究

Research on Angle Measurement Technology of Disconnect Switch Based on Optical Fiber Sensor

为解决现有测量接触网隔离开关角度的电子式传感器取电难、易受电磁干扰等问题,采用光纤传感器设计了一款用于测量隔离开关角度的传感器,利用以直代曲的思想,将接触网隔离开关的旋转角度转换为光纤测距的方式进行测量,采用曲线拟合算法对所设计的光纤角度传感器存在的非线性进行补偿,并将补偿后的光纤角度传感器同高精度霍尔角度传感器一起安装在SBE27.5kV/2 000A隔离开关上进行试验测试。试验结果表明:相比于常用的BP神经网络,经曲线拟合算法校正后的光纤角度传感器拟合度由92.47%提高到了99.94%,线性度由9.66%提高到了0.84%,光纤角度传感器的精确度达到了0.677。表明该方案具有较高的精确度和较强的可行性,适用于对接触网隔离开关分合闸的检测。

In order to solve the problems that the existing electronic sensors for measuring the angle of the contact line isolation switch are difficult to obtain electricity and are susceptible to electromagnetic interference, a sensor for measuring the angle of the isolation switch is designed using an optical fiber sensor, using the idea of replacing the curve with straight, The rotation angle of the catenary isolation switch is converted to the optical distance measurement method for measurement, and the curve fitting algorithm is used to compensate for the nonlinearity of the designed optical fiber angle sensor. And install the compensated optical fiber angle sensor together with the high-precision Hall angle sensor on the SBE27.5 kV/2000 A isolating switch for experimental testing. The experimental results show that: compared with the commonly used BP neural network, the fitting degree of the optical fiber angle sensor corrected by the curve fitting algorithm has increased from 92.47% to 99.94%, and the linearity has increased from 9.66% to 0.84%. The optical fiber angle sensor The accuracy reached 0.677. It shows that the scheme has high accuracy and strong feasibility, and is suitable for monitoring the opening and closing of the catenary isolation switch.