一种新型光电电压互感器  

Novel optical voltage transducer

作　　者：陈丽娟[1] 许晓慧[1,2] 包玉树 袁宇波 

机构地区：[1]东南大学电气工程学院,江苏南京210096 [2]江苏电力试验研究院有限公司,江苏南京211102

出　　处：《电力自动化设备》2010年第7期114-116,共3页Electric Power Automation Equipment

摘　　要：提出了一种用于高压测量的新型光学电压互感器。该互感器由形变测量单元、光电转换电路及供电单元3个部分组成。利用压电晶体的逆压电效应,在高压作用下,压电晶体产生交替形变,并通过光杠杆方法来测量压电晶体的交替形变。详细介绍了形变检测原理。为了实现互感器结构的紧凑化,提出了基于平行板的多反射光臂的结构,以达到互感器所需求的精度。该光臂的长度仅依赖于平行板的高度和入射光束的水平角度,和平行板之间的相对距离无关,简化了互感器的安装和设计。此外,对光电信号的处理进行设计,依据所设计的光电信号处理电路可以实现0.1级(500kV)的互感器精度。A novel optical voltage transducer for ultra-high voltage measurement is proposed,which consists of three parts：deformation measurement unit,photoelectric conversion circuit and power supply unit.Based on the converse piezoelectric effect,the alternating deformation of quartz crystal under alternating high voltage is measured by the optical lever.The principle of deformation detection is introduced and the multi-loop optical arm embedded in two parallel plates is applied to reduce the size of transducer with required accuracy.The optical path is dependent only on the height of the parallel plates and the laser incident angle,and independent of the width of the parallel plates,which facilitates the structural design of transducer.A precise photoelectric conversion circuit is designed to convert the optical signal to electric voltage,based on which,the ultra-high voltage transducer （500 kV） meets the accuracy class of 0.1.

关 键 词：光电电压互感器 压电 光电探测 光杠杆 石英 

分 类 号：TM451.6[电气工程—电器]