Development of a digital algorithm based on instantaneous power transform for on-line monitoring of the dielectric loss factor

Among the digital algorithms presently available for on-line monitoring of the dielectric loss factor of power apparatus, there are unavoidable limitations that most of them must meet strictly the synchronous sampling criterion, simultaneously with a low calculating resolution. Based on instantaneous power transform, this paper presents a new digital algorithm to improve monitoring accuracy of the dielectric loss factor, and theoretical basis of the algorithm is also deduced. Simulation results show that the new algorithm renders good application performance when there exists power frequency fluctuation which demonstrates the algorithm can effectively solve the issues incurred from asynchronous sampling.