220kV组合式光学电压电流互感器的设计

Design of 220 kV Combined Optical Voltage and Current Transformer

介绍了一种基于 Pockels晶体纵向电光效应和火石玻璃 Faraday磁光效应的 2 2 0 k V组合式光学电压电流互感器的传感机理、系统设计及试验结果。其电压传感头将2 2 0 k V的高电压直接加到锗酸铋 (BGO)晶棒上实现对电场的积分 ,受电场扰动小而且灵敏度得到提高 ;其电流传感头的光路围绕电流母线棒闭合 ,能减小导体位置变化及外界磁场的影响。系统按 2 2 0 k

This paper introduces the fundamental principle,system design and test results of a new 220 kV Combined Optical Voltage and Current Transformer. It senses voltage and current by making utilities of longitudinal electrooptic effect of a Pockels crystal and Faraday megnetooptic effect of a closed-loop flint. The 200 kV high voltage is directly applied on the Bi 4Ge 3O 12 (BGO) crystal in the voltage sensor, thus a line integration of the E-field is availabe. It has high immunity to electric interference and high sensitivity. In the current sensor, a light beam circles around the bus bar. The effects of the location movement of the conductor and external magnetic field are reduced. It has passed power frequency withstand voltage and lightning impulse tests according to the standards applied to 220 kV level instrumentation, as well as the linearity test.