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The on-line detection of dielectric loss factors is limited by various factors, including system frequency fluctuation, harmonic and environmental noise interference. The traditional measurement method can not guarantee the accuracy of measurement because of the large amount of calculation and the disturbance. Based on the analysis of the performance of triangular convolution window and all phase data processing, a new method for detecting dielectric loss angle is proposed, and the phase angle correction algorithm is improved. The algorithm can accurately extract the fundamental phase angle and calculate the dielectric loss angle. Compared with several classical methods, the algorithm has higher detection accuracy and is less affected by the above factors.