To measure the dielectric loss angle (tan δ) of electrical power system,a comprehensive on-line measurement method was proposed with narrow-band half wave Fourier transformer.The original bus voltage and the end capacitor divider voltage value of capacitive equipment is calculated by band pass filter.The band pass is designed by zero,pole assignment method.Then the voltage phase angle can be calculated by the half wave Fourier transformer from the fundamental component.Finally the tanδ is got.The algorithm is shorter than the fundamental wave phase separation method for the length of data window and it has good inhibition on the DC component and even harmonics component.The results of numerical case study show that this algorithm has similar results with the traditional fundamental phase separation,but it requires a small amount of data to meet the on-line monitoring accuracy and real-time requirements.%针对电力系统中容性设备介质损耗角正切(tanδ的测量,在末屏电容分压绝对测量条件下,提出了应用窄带通半周波傅里叶算法的tanδ值在线测量方法.容性设备母线电压和末屏分压原始值经过零、极点配置法设计的窄带通滤波器处理后,由半周波傅里叶算法分别提取其基波分量电压相角,计算tanδ值.该算法所需数据窗长度比基波相位分离法短,能够快速计算tanδ值；并对直流分量和偶次谐波分量起到了良好的抑制作用.算例结果表明,此算法与传统的基波相位分离法、一阶差分后半波傅里叶算法有相近的结果,并且所需数据量小,满足了在线监测的准确性和实时性要求.
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