Dielectric loss angle measurement under non-synchronization sampling by the use of fast Fourier transform method will inevitably produce spectrum leakage and picket fence effect and will seriously influence the accuracy of dielectric loss angle measurement.In this paper

a kind of dielectric loss angle measurement method based on Hanning and Nuttall mixed convolution window with three spectral lines interpolation is proposed.It is known by comparison and analysis of the proposed algorithm with the classical windows algorithm that the mixed convolution window has faster side lobe attenuation rate and narrow main lobe width and can effectively overcome the dielectric loss angle measurement error caused by non-synchronization sampling.The accuracy and reliability of the proposed algorithm are verified further by simulation experiments of dielectric loss angle measurement under frequency variation

harmonic content fluctuation

white noise influence and sampling point variation.