具有等价非互易特性的光学电流互感器抗磁场干扰技术研究

The magnetic interference seriously affects the operation performance of magneto-optic glass optical current sensors working in smart substation, which is difficult to be solved by existing methods. The experimental results show a non-equivalent nonreciprocal phenomenon in the Faraday rotation effect under the nonuniform magnetic field. This project will build the infinitesimal cascade Jones matrix model of non-uniformly induced medium, and refine the physical parameters of the nonuniform magnetic field to explore the mechanism of the non-equivalent nonreciprocal phenomenon of Faraday rotation effect. Thus the equivalent nonreciprocal optical current sensing technique will be presented to achieve the goal of equivalent nonreciprocal. Magneto-optic glass optical current transformer is one of the typical applications of Faraday magneto-optic effect, its essence is the nonuniform magnetic field integral through the photosensitive road, which belongs to the category of discrete integral loop magnetic field. This project will study the problem of magnetic field integral along discrete loop. The model of magnetic field integral along multilateral discrete loop and its zero-sum integral conditions will be proposed, and the theoretical system of the discrete loop magnetic field integral will be built. Basing on it, the multilateral discrete loop zero-sum magnetic resistance structure technology will be proposed. The magnetic-optic glass optical current transformer with equivalent non-reciprocal characteristics will be designed to solve the problem of anti-interference. Through the above researches, this project will establish the anti-interference theoretical and technical system of magnetic-optic glass optical current transformer.

磁场干扰严重影响了光学电流互感器在智能变电站中的运行效果，现有的方案难以有效解决。实验发现了不均匀磁场环境下法拉第磁光效应的不等价非互易性，传统的理论无法解释，影响了光学电流传感单元感知磁场的精度。本项目将构建感应不均匀介质的微元级联琼斯矩阵，提炼刻画不均匀磁场的物理参数，探究不均匀磁场法拉第磁光效应的机理，从而提出等价非互易光学电流传感技术，实现等价非互易目标。磁光玻璃型光学电流互感器是法拉第磁光效应的典型应用之一，其实质是沿传感光路对感知的不均匀磁场的积分，属于离散环路磁场积分的范畴，通过对离散环路磁场积分问题的研究，提出多边离散环路磁场积分模型及零和积分条件，建立离散环路磁场积分的理论体系，提出多边形离散环路零和御磁技术。设计具有等价非互易特性的零和御磁结构的磁光玻璃型光学电流互感器，解决实用化过程中的抗磁场干扰问题，形成磁光玻璃型光学电流互感器抗磁场干扰的理论和技术体系。

光学电流互感器是品质最好的电子式电流互感器，其优异的暂态测量性能为智能电网的控制保护提供了准确的测量依据。但恶劣运行环境下的磁场干扰严重影响了光学电流互感器在智能电网中的运行效果，现有的方案难以有效解决。本项目研究了不均匀磁场法拉第磁光效应理论，构建了感应不均匀介质的微元级联琼斯矩阵，建立了不均匀磁场法拉第磁光效应的光路模型，探究了不均匀磁场法拉第磁光效应的机理；研究了等价非互易光学电流传感技术，提出了不均匀磁场光学电流传感的等价非互易补偿方案，实现了不均匀磁场法拉第磁光效应的等价非互易目标，设计了等价非互易光学电流传感单元；研究了离散环路磁场积分理论，构建了多边形离散环路磁场积分模型，提出了多边形离散环路磁场的零和积分条件，提出了多边形离散环路零和御磁技术，建立了光学电流互感器抗外磁场干扰的理论和技术体系，为光学电流互感器的实用化设计提供了思路；研制了零和御磁结构光学电流互感器样机，设计了磁场干扰实验，验证了等价非互易光学电流传感技术和多边形离散环路零和御磁技术的有效性和实用性，为光学电流互感器的抗磁场干扰设计提供了解决思路，促进光学电流互感器的推广应用。. 在项目执行期间，发表了相关学术论文7篇，其中SCI检索4篇，EI检索1篇，核心2篇；申请国家发明专利7项，其中授权发明专利3项，授权实用新型专利1项；获得省部级科技奖励3项，国网公司奖励2项；参与制订互感器相关国家标准1项；研制了不同类型的光学电流传感器样机共20套，研制了零和御磁结构光学电流互感器样机2套。.