乒乓式励磁绕组接地保护若干问题的分析
兰华，张波，李卫国
(东北电力大学，吉林吉林1 32 01 2)
摘要：针对目前乒乓式励磁绕组接地保护存在的问题，从励磁电压变化、元件参数选取、交流分量等方面对乒乓式励磁绕组接地保护的测量精度进行了理论分析和仿真验证。实验结果表明：在桥臂电阻和测量电阻选取不同阻值时保护精度不同，励磁电压变化时保护的精度也相应变化 为了尽量减少交流分量的影响，采用傅里叶算法对测量值进行了滤波处理。仿真结果验证了理论分析的正确性，测量数据与测量精度满足实际需要。
关键词：乒乓式；转子接地保护；励磁电压；暂态
Analysis of ping—pong type of rotor earth fault protection
LAN Hua，ZHANG Bo，LI Wei-guo
(Northeast Dianli University，Jilin 132012，China)
Abstract：In view ofthe problem of current ping—pong·type of rotor earth fault protection，this paper does theoretical analysis and simulation on its measuring accuracy from the the aspects of excitation voltage change，the components parameters selecting and AC components．ere．The experimental results show that the accuracy iS different when the bridge al-nl resistance and measurement
resistance are diferent，protection also changes accordingly in accuracy with excitation voltage changed．In order to minimize the impact ofthe AC component，Fourier algorithm iS used to filter the measurements．The simulation resuks confirm the corectness of theoretical analysis．Measurement data and measurement accuracy can meet the actual demand．
Key words：ping—pong-type； rotor earth fault protection；excitation voltage；transient
中图分类号： TM772 文献标识码：A 文章编号： 1674—3415(2010)15—0028—05
电力系统保护与控制 第38卷第l5期 2010年8月1日
发表于 2010-12-1 20:44:30
