CAJ | 학술논문

现有的光学电压互感器(OVT)大多基于电光晶体的 Pockels 效应，即电光晶体在外加电场的作用下其折射率发生变化，使得沿某一方向射入晶体的线偏振光产生电光相位延迟，延迟量与外加电场成正比。由于无法实现对晶体电光相位延迟的直接测量，通常采用偏光干涉测量模式，将相位延迟转变为光强调制，通过对光强的检测实现电压测量。这种测量模式反映了光功率的大小，但仅能近似线性地测量有限的电光相位延迟，其稳定性与可靠性受到温漂、晶体附加相位延迟、半波电压等问题的限制，无法满足电力系统的实用要求。文中分析了偏光干涉测量模式的局限性，并对双光路补偿法进行了讨论。
현유적광학전압호감기(OVT)대다기우전광정체적 Pockels 효응，즉전광정체재외가전장적작용하기절사솔발생변화，사득연모일방향사입정체적선편진광산생전광상위연지，연지량여외가전장성정비。유우무법실현대정체전광상위연지적직접측량，통상채용편광간섭측량모식，장상위연지전변위광강조제，통과대광강적검측실현전압측량。저충측량모식반영료광공솔적대소，단부능근사선성지측량유한적전광상위연지，기은정성여가고성수도온표、정체부가상위연지、반파전압등문제적한제，무법만족전력계통적실용요구。문중분석료편광간섭측량모식적국한성，병대쌍광로보상법진행료토론。
The optical voltage transducer (OVT) is mainly based on the Pockels effect of an electro-optic crystal.According to the Pockels effect,the refractive index of crystal will change under the action of an applied electric field.This change will then make the linearly polarized light inj ected into the crystal along a certain direction generate an electro-optic phase delay that is proportional to the applied electric field.Since the electro-optic phase delay can not be directly acquired,the polarization interference measuring model is always employed.It converts an electro-optic phase delay into the voltage to be measured with light intensity modulation.Such a measuring mode,being dependent on light power detection,can only realize approximate linear measurement of limited phase delay.And,restricted by the temperature drift,the additional phase delay and half-wave voltage,the stability and reliability of OVT cannot meet the service requirements of the power system.This paper analyzes the limitations of polarization interference measuring mode and discusses the double optic route method.