基于谐波分析的变压器套管介损因数检测  

Transformer Bushing Dielectric Loss Factor Based on Harmonic Analysis

作　　者：吕刚 吕金壮 谭劲 张瑞亮 罗宗源 LV Gang;LV Jin-zhuang;TAN Jin;ZHANG Rui-liang;LUO Zong-yuan(Guiyang Bureau of UHV Transmission Company,China Southern Power Grid Co.,Ltd.,Guiyang 550000 China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司贵阳局,贵州贵阳550000

出　　处：《自动化技术与应用》2023年第3期27-29,49,共4页Techniques of Automation and Applications

基　　金：南方电网贵阳局超高压输电公司提供的科研项目资助(CSPGKJ2010001)。

摘　　要：传统方法常因电网频率波动和存在高次谐波导致基波相位测量精准度较差,为此提出基于谐波分析的变压器套管介损因素检测方法。通过计算电压和电流经过零点的时间差设计介质损耗角正切检测框架,进行傅里叶级数分解检测,降低电子电路中零漂的干扰,利用修正理想采样频率法消除频谱泄漏产生的测量误差,凭借修正采样频率和采样周期实现了自动化检测。通过仿真实验结果表明方法较传统方法相比有着较高的测量精度,且计算简便、利于实际工程应用。The accuracy of fundamental phase measurement of the traditional methods is often poor due to grid frequency fluctuations and the presence of high-order harmonics.For this reason,detection method of transformer bushings dielectric loss factors based on harmonic analysis is proposed.By calculating the time difference between the voltage and current passing through the zero point,the dielectric loss tangent detection framework is designed,and the Fourier series decomposition detection is performed to reduce the interference of zero drift in the electronic circuit.It corrects the sampling frequency and sampling period to realize automatic detection.The results of simulation experiments show that the proposed method has higher measurement accuracy than traditional methods,and the calculation is simple,which is beneficial to practical engineering applications.

关 键 词：谐波分析 变压器套管 介损因数 频谱泄漏 修正理想采样频率 

分 类 号：TP206.3[自动化与计算机技术—检测技术与自动化装置]