Experimental and theoretical investigation of harmonic distortion in high voltage 3-phase transformers

The purpose of this paper is to investigate the harmonics induced to high voltage side of distribution transformers. These harmonics are common in low voltage installations due to high penetration of electronics. Based on field measurements on existing building facilities, the harmonic components were identified and then simulated using appropriate software. High frequency model for the transformer windings simulation was used. The harmonic problem is analyzed, using simulations and real measurements as input harmonic distortion, for the low and medium voltage windings. Different harmonic filters are investigated in order to reduce harmonic distortion. Simulated results are obtained for different filtering schemes and their comparison is attempted.