Harmonics Distortion Analysis on HT and LT side of 11KV/440V Industrial Transformer

This paper works on the transformer behaviour based upon total harmonic distortion of the transformer LT and HT side by logging a power analyser for a duration and recorded all the parameters like voltage, current, frequency of all the three phase as well as harmonic distortions of voltage and current of all three phases. The average of the whole time distortion of the phases been calculated and comparison for the permissible range of harmonics. The main reason of harmonics are nonlinear loads and due to these loads injection of voltage and current harmonics in the system, and this leads to distortion of system and equipment’s. These distortions is analysed to confirm the standard of IEEE of 519-2014 for the distortions exceeding the maximum limit for both voltage and current. For the improvement in the overall system and reduction of harmonics it is necessary to analyse the harmonics values in operating conditions and if required it is necessary to take steps to reduce distortions. The loss addition is responsible for derating of transformer that may shorten device lifetime.