By improving the structure of optical path, catching the sample signal of optical voltage sensor in reason and controlling the temperature of secondary part, the stability of OMU has been improved. Then, the OMU can achieve 0.2 accuracy class.

• 通过改进光路结构、合理地获取电压传感器的取样信号及对二次信号处理部分进行温度控制 ；提高了 OMU的稳定性和准确度 (达到 0 .；2级 )