110 kV纵向光学电压互感器的结构优化与设计  

Structural optimization and design of 110 kV longitudinal Optical Voltage Transducer

作　　者：祝俊男 谭巧 ZHU Junnan;TAN Qiao(College of Physics and Electronic Information Engineering,Minjiang University,Fuzhou 350108,China;College of Mechanical and Electrical Engineering,Fujian Agriculture and Forestry University,Fuzhou 350100,China)

机构地区：[1]闽江学院物理与电子信息工程学院,福建福州350108 [2]福建农林大学机电工程学院,福建福州350100

出　　处：《红外与激光工程》2024年第9期329-336,共8页Infrared and Laser Engineering

基　　金：国家自然科学基金青年基金项目(62005110);福建省自然科学基金项目(2022J011113)。

摘　　要：光学电压互感器(Optical Voltage Transducer,OVT)是重要的电力系统测量设备。在使用过程中,因碰撞、连接不稳定或温度变化等问题,会导致传感光路或内部锗酸铋(BGO)晶体发生微小偏移。当偏移为0.5°时,所引起的最大积分电压误差可达0.1%,这对于0.2%的标准要求而言是不可接受的。为了减小偏移带来的误差,并改善BGO晶体内电场的均匀性,文中针对110 kV纵向调制型OVT提出了一种方解石介质分层和氮化铝包裹法,两端采用Φ10 mm×75 mm的方解石对BGO晶体进行分压,并覆盖一层0.5 mm厚的氮化铝来避免与SF6气体直接接触。该结构模型成功解决了其他方法无法解决的晶体或者光路偏移导致的积分电压误差问题。根据仿真结果可知,其偏移误差降低至0.008%以下,并且通过实验所得到图像的标准差提高了35%以上,光强的分布均匀性得到了提高。仿真和实验结果均表明,这种优化改进方案显著提升了OVT的性能和稳定性,为电力系统的精准测量提供了可靠保障。Objective With the continuous improvement of power system transmission capacity and voltage level,previous voltage transformers have exposed some fundamental shortcomings,such as poor insulation performance,large volume,electromagnetic resonance,easy magnetic saturation,etc.,which are difficult to meet the needs of smart grid development.Optical Voltage Transformer(OVT)adopts optical sensing technology,which can overcome the above defects and better meet the development needs of China's smart grid,with good development prospects.However,there are still many unresolved issues with OVT.In practical applications,small positional deviations between optical devices may occur due to vibration,unstable connections,and thermal expansion and contraction,resulting in uneven distribution of internal electric fields and affecting measurement results.However,current research methods have only reduced the unevenness and coefficient of the internal electric field,and have not improved the accuracy of measurement results when small crystal and optical path offsets occur in OVT crystals.Therefore,this article conducts electric field simulation on the longitudinal modulation OVT structure of 110 kV,analyzes the non-uniformity and coefficient inside the electric field,and proposes a new dielectric layering and wrapping method when offset occurs.Methods The sensing unit of OVT is simulated and analyzed using ANSYS Maxwell.Firstly,the distance between electrodes is determined(Fig.2),and then a layered structure is selected(Fig.3).Next,the packaging material and structure are selected(Tab.5),and finally the thickness of the packaging is determined(Fig.6).By using calcite with relatively high dielectric constant to divide the voltage of BGO and wrapping it with Al_N,the adverse effect of electric field non-uniformity after contact between BGO with higher dielectric constant and SF6 gas with lower dielectric constant is greatly eliminated.And an experimental setup is built to verify its simulation results(Fig.9).Results and Discussions

关 键 词：光学电压互感器 POCKELS效应 内电场分布 电场积分误差 

分 类 号：TM451[电气工程—电器]