Modeling and analysis of 100 KVA distribution transformer including the core saturation effect

Magnetic core saturation of transformers and rotating machines generate harmonics. Harmonics are integer multiples of the fundamental frequency. Harmonics is caused by nonlinear devices in the power system. Due to the non-linear loads, power frequency harmonics exist mainly in distribution systems. The current harmonics cause voltage harmonics, hence resulting in nonsinusoidal supply voltage in the system. Harmonic voltage distortion may cause additional losses and heating in laminated transformer cores due to the distorted flux waveform. Meaning of saturation means that further increase in magnetic field force (mmf) do not result in proportional increase in magnetic field flux. This paper includes the effect of saturation on hysteresis and excitation current of 100kVA Distribution transformer. This paper presents a hysteresis based transformer simulink model to estimate transformer saturation. The basic idea of the method is to evaluate the transformer excitation current and hysteresis with and without core saturation effect. The whole system is studied in the MATLAB-Simulink Software and the corresponding results are obtained and analysis.