摘要
在采用基于抗磁性材料的光学电流互感器(OCT)测量小电流时,由于测得的信号已被OCT内部固有的噪声严重污染,测得的读数不能正确反映被测电流的数值。由于OCT内部的噪声基本上与被测电流信号所在的频段相重叠,因此无法使用传统的滤波器方法将其滤除。作者将一种基于自适应滤波技术的信噪分离方法应用于在河北省保定市供电局某变电站110kV线路上挂网运行的自适应光学电流互感器中。实践表明,自适应信噪分离器可以将有用信号和OCT的固有噪声不失真地完全分离,因此这种方法可以提高OCT测量小电流的准确度。
When small current is measured by opticalcurrent transducer (OCT) based on diamagnetic material, the measured signal is deeply polluted by the inherent noise ofOCT, so that the value of being measured actual current cannot be correctly represented by the reading from OCT. Because the frequency band of the noise within the OCT and that of the being measured current are overlapped, so it is unavailable tofiltrate the noise by conventional filters. A method to recovery the signal from polluted data, which is based on aself-adaptive-filtration technology, is applied to the OCT which is operated for a 110kV transmission line within a substation. The practical measured data show that with the self-adaptive signal noise decomposer the signal of measured current can be entirely separated from the the inherent noise of OCT without distortion, therefore, using this method the accuracy ofmeasuring small current by OCT can be improved.
出处
《电网技术》
EI
CSCD
北大核心
2003年第11期64-67,共4页
Power System Technology