基于自适应正弦滤波的低压电流互感器在线检测方法研究  

Research on Online Detection Method of Low Voltage Current Transformer Based on Adaptive Sine Filtering

作　　者：付佳佳 卢丽鹏 刘彩霞 李玉洁 魏诗楠 FU Jiajia;LU Lipeng;LIU Caixia;LI Yujie;WEI Shinan(Wuhu Power Supply Company,State Grid Anhui Electric Power Co.,Ltd.,Wuhu Anhui 241000,China)

机构地区：[1]国网安徽省电力有限公司芜湖供电公司,安徽芜湖241000

出　　处：《自动化与仪器仪表》2024年第10期84-88,共5页Automation & Instrumentation

基　　金：国网安徽省电力有限公司科技项目“实际工况下低压CT在线量测技术研究及装备研制”(B312C023000B)。

摘　　要：基于低压电流互感器缺乏电流有效值和相位角分析而导致电流谐波幅度检测不精准的问题,提出了自适应正弦滤波的低压电流互感器在线检测方法。根据低压电流互感器变比原理,提取变比误差数据。构建低压电流互感器在线检测的自适应正弦过滤结构,计算自适应正弦滤波的输出信号。最小化处理输入信号与输出信号之间的误差,获得最佳滤波效果。构建基于自适应正弦滤波的高频信号网络通路,计算电流信号有效值和相位角,以此检测低压电流互感器正确性和极性。由实验结果可知,该方法在电流频率0~0.5 Hz范围内,谐波幅度变化范围为[-47~-16]dB,与实际检测结果存在2 dB的检测误差,具有精准检测效果。Based on the problem of inaccurate detection of current harmonic amplitude caused by the lack of current effective value and phase angle analysis in low-voltage current transformers,an adaptive sine filtering online detection method for low-voltage current transformers is proposed.Extract ratio error data based on the principle of low voltage current transformer ratio.Construct an adaptive sine filtering structure for online detection of low-voltage current transformers,and calculate the output signal of the adaptive sine filtering.Minimize the error between processing input signals and output signals to achieve the best filtering effect.Construct a high-frequency signal network path based on adaptive sine filtering,calculate the effective value and phase angle of the current signal,and detect the correctness and polarity of the low-voltage current transformer.From the experimental results,it can be seen that this method has a harmonic amplitude variation range of[-47-16]dB in the current frequency range of 0-0.5 Hz,and there is a detection error of 2dB compared to the actual detection results,which has a precise detection effect.

关 键 词：自适应正弦滤波 低压电流互感器 在线检测 电流有效值 相位角 

分 类 号：TP127[自动化与计算机技术—控制理论与控制工程] TP274[自动化与计算机技术—控制科学与工程]