光学电压互感器的基本原理与研究现状

Basic principle and current development of optical voltage transformer

某些晶体在电场作用下,折射率发生变化,当光通过时会发生双折射现象,现在研究的光学电压互感器多是基于此种现象的。与传统电压互感器相比,光学电压互感器无铁磁谐振和铁芯饱和,无燃烧和爆炸危险,实现了数字输出,有绝缘强度高、抗干扰能力强等突出优点。概述了国内外光学电压互感器的类型和结构,分析了它们的优缺点。并针对目前光学互感器存在的温度稳定性和长期运行的可靠性等关键问题,介绍了一些具体的解决办法。

The refractive index of some crystals changes when an electric field is applied to them.It will result in birefringent phenomenon of the light beam,based on which many of the current optical voltage transformers are studied. Different from the conventional transformer,the optical voltage transformer does not produce ferromagnetic resonance,core saturation,fire and burst.Moreover,it realizes digital output,has high insulating intensity and is immune to electromagnetic interference. Different types and structures of optical voltage transformers are summarized and their flaws and merits analyzed. Some solutions are introduced to solve the problems of temperature stability and long-term operational reliability.