中文摘要：

高压电网中过电压的测量对于研究过电压的行为特征和绝缘配合设计具有重要的意义。为了实现高压电网的安全准确测量，采用具有良好一次电光效应特性的铌酸锂晶体设计了无源集成的光电电压传感单元以及使用该单元的非接触式过电压监测传感器。传感器的分压单元由单元自身电容和定值电容并联构成的低压臂电容与高压导线和感应金属板的耦合电容串联构成。光电电压传感单元全光纤连接，只需感应从分压单元引出的较低幅值电压信号，且无需在传感器安装点提供电源。对设计的传感器的各项测试表明：该传感器不仅具有良好的线性工作区，同时在雷电和操作冲击电压下其高频响应精度较高（幅值反算误差〈3％，响应时间误差〈0．1μs），适用于各电压等级的过电压非接触无源监测。

英文摘要：

The measurement of overvoltage in high-voltage power networks is of significance to understand the overvol- rage and the design of insulation coordination. In order to measure overvoltage in high-voltage networks safely and accurately, we developed an integrated passive sensor unit based on the electro-optic effect of LiNbO3 crystal, as well as a non-contact overvoltage monitoring sensor with the unit. The sensor utilizes a series capacitive divider comprised of a long-voltage arm capacitance, which consists of the sensor＇s own capacitance and a fixed capacitor connected in parallel, and the coupling capacitance between high-voltage line and a metal plate. The electro-optic unit uses full fiber connection, and it only needs to detect the low voltage sensed by the divider unit without requiring power supply at the installation site. Multiple tests of the sensor indicate that the sensor has not only an effective linear operating region but also fast and precise high-frequency responses to both lightning and switching impulse with the error of amplitude below 3% and the time error of response below 0.1 μs. Hence the sensor is applicable to the non-contact passive overvoltage measurement in a wide range of voltage levels.