摘要
为配合随调式消弧线圈的使用,提出了一种扫频检测系统对地电容的改进型方法。在寻找系统谐振频率时,以幅值判断代替传统的相位判断,使检测更为方便准确;通过对电抗参数的合理设计,确定注入变频信号的频率范围,使其避开电网频率,这样有利于检测信号的分离;改进了扫频方式,缩短了电容检测的时间;针对文中的方法,提出了一种简单实用的信号处理算法,能有效消除工频及其他噪声对检测信号的干扰。模拟试验验证了所提出方法的有效性。
In coordination with the application of post-set arc suppression coil, a frequency scanning based modified method for detecting system capacitance to earth is proposed. During the search of system resonance frequency, traditional phase comparison is replaced by amplitude comparison to make the detection more easy and accurate; by means of rational design of reactance parameters, the frequency range of the injected variable frequency signal is determined to keep out of network frequency, thus it is in favor of signal separation; through the improvement of frequency scanning mode, the time for capacitance detection is shortened. Corresponding to the proposed method, a simple, practicable signal-processing algorithm is put forward that can effectively eliminate the interferences from power frequency signal and other noise signals. The effectiveness of the proposed method is verified by simulation results.
出处
《电网技术》
EI
CSCD
北大核心
2008年第17期40-45,共6页
Power System Technology
基金
国家自然科学基金资助项目(50477047)。~~
关键词
电容电流
扫频
幅值比较
随调式消弧线圈
电力系统
capacitive current
frequency scanning
amplitude comparison
post-set arc suppression coil： powersystem
