ABSTRACT
Dielectric loss angle is one of the effective means of estimating the insulation performance of high voltage electrical equipment. Accurate extraction of harmonic voltage and current signals is the key to the detection of dielectric loss angle. Based on improved ITD algorithm and the Least Square (LS) method, in this paper we proposed a detection method for dielectric loss angle. Above all, extract the harmonic voltage and current signals by using improved ITD. Then obtain the phase of harmonic voltage and current by using the LS method to achieve high-precision detection of dielectric loss angle. The improved ITD-LS method is validated by simulation. When the true value of dielectric loss angle, frequency fluctuations of fundamental voltage, and the three harmonic ratio change, the DC component proportion, sampling points change, respectively. Finally, the simulation results demonstrate the feasibility and effectiveness of the proposed method.
