Transformer magnetic material characteristic is nonlinear. This non linearity is the main reason for harmonics during excitation. Sources of harmonics in transformer may be classified into four categories as follows: 1. NORMAL EXCITATION: Normal excitation current of a transformer is non-sinusoidal. The distortion is mainly caused by zero sequence triplen
Category: Harmonics
Harmonics has effect on transformer in various ways, e.g.: 1. Core loss: Harmonic voltage increases the hysteresis and eddy current losses in the lamination. The amount of the core loss depends on harmonic present in supply voltage design parameter of core materials and magnetic circuit. 2. Copper loss: Harmonic current
