无电极型工频电场传感器的设计

分析了电力系统中工频电场测量的技术手段和应用现状，指出现有手段的存在的问题；利用集成光学技术研制了一种基于铌酸锂晶片铁电畴反转的无电极电场传感器，该传感器内部没有金属部分，具有集成度高、对被测电场影响较小等优点；分析了传感器的设计要点，针对电力设备工频电场测试的实际需求完成传感器的参数设计，并研究相关的工艺流程；针对传感器半波电场太大的特点设计了合适的方案测试传感器的特性；根据国标GB/T12720-1991建立工频电场测试系统，并利用该系统完成传感器的工频电场标定测量实验。实验结果表明，该传感器在较大测量范围内具有较好的线性度，适合于电力系统工频电场的测量。

Design of Non-electrode Power Frequency Electric Field Sensor

The existing measurement methods and applications are analyzed in this paper. A kind of non-electrode power frequency electric field sensor was developed based on the domain inversion of the LiNbO3 crystal plate. This kind of sensor was fabricated by integrated optics and has no metal part in it. It has high-integrated level and will affect the field under test very little. The key points of designing the sensor are analyzed, sensors for the measurement of power frequency electric field in power system are designed with proper parameters, and the manufacturing process is researched. Testing programs for this kind of sensor which has very large half wave electric field are designed and the characteristics of the sensor are tested. Testing system of power frequency electric field is established according to GB/T12720-1991 and the calibration test experiment of the sensor is carried out. The result of the experiment indicated that the sensor has good linearity of large range and is suitable for the measurement of power frequency electric field in power system.