基于模间干涉的光学电压互感器的设计

Design of Optical Voltage Transducer Based on Modular Interference

针对电力工业向高电压、大容量的输配电电网发展的需求,提出了一种新型的光学高压电压互感器。该方法是根据保偏光纤模间干涉原理,采用石英晶体的逆压电效应的方法。该光学电压互感器的工作原理是在圆柱形石英晶体上施加交流电压使其产生压电形变,使缠绕在圆柱表面的椭圆芯双模光纤中的LP01和LP11模的相位差发生变化,最终得到被测电压。根据群模态折射率差与归一化频率的关系,对光纤的参数进行了研究。通过实验对该互感器的设计进行了可行性研究。实验结果表明,本案具有较好的精度和线性度,为光学电压互感器的研究提供了理论基础。

In order to satisfy the modern power industry demands of high voltage and large power,a new type of optical voltage transducer was presented.The structure of optical voltage transducer was designed with converse piezoelectric effect of quartz crystal and interference between modes in polarization maintenance fiber.The piezoelectric deformation of the cylinder-shaped transducer crystal induced by an applied AC voltage was sensed by an elliptical-core dual-mode fiber wound on the circumferential surface.White-light interferometry and active homodyne phase tracking detect the resulting modulation of the differential phase between LP01 mode and LP11 mode in fiber.According to the relation between group modal refractive index difference and normalized frequency,the optical fiber＇s parameter is researched.The feasibility of the designed voltage transducer is verified with experiments.The results show that the voltage transducer based on the principle mentioned above possesses better accuracy and linearity,which can provide theory basis for optical high voltage transducer.