锗酸铋(BGO)晶体的双折射误差极大地制约着准互易反射式光学电压互感器(OVS)的精度.根据各光学元器件的参数,建立了各器件的琼斯矩阵以及光路系统的数学模型.在此模型基础上,仿真计算了晶体双折射误差对系统性能的影响；提出了晶体应力双折射对系统输出偏置的影响可以通过滤波算法进行抑制的方法,并设计了一个高通滤波器对数字输出进行抑制.实验结果表明,加入高通滤波器不改变光学电压互感器静态特性,抑制了晶体双折射引起的输出漂移,提高了互感器的测量精度.%The birefringence errors of Bi4Ge3O12 crystal restrict the accuracy of the quasi-reciprocal reflective optical voltage sensor (OVS). According to the parameters of the optical instruments, their Jones matrixes and the mathematical models for the optical transmission of OVS were built. The influences of the crystal birefringence error on the system performance are calculated by simulation based on the proposed model. Additionally, the solution for suppressing the offset of the system crystal birefringence output is derived by filtering algorithm, and a high-pass filter to restrain the digital output is designed. The experimental results indicate that the designed high-pass filter does not change the static performance of OVS, but it can suppress the output drift caused by crystal birefringence, and improve the precision of OVS.
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