Procedure for Determination of Harmonic Distortion along the Distribution Network

Usually, harmonics are the base point when engineers start to analyze waveform distortion. Frequencies of these voltage and current waveforms are integer multipliers of the base frequency of power system (50 Hz or 60 Hz). If it is not the case then these are named as intermediate harmonics. The sinusoidal waveforms of voltage characterize the ideal power system with the highest clarity of base frequency. In technical means, higher harmonics source generated appearance is caused by an imperfect stator roller line and uneven coil configuration, by power transformers magnetizing current contained and by power transformers core saturation emerging.All the listed causes are generated by reactive power compensating static devices. Part of the total harmonic distortion of source-generated appearance (distribution power transformers or generators) is neglected. Harmonic and intermediate harmonic distortions are primarily caused by equipment with nonlinear voltage and current characteristics. Non-sinusoidal currents appear if a load current is not linearly related with enforced voltage. In a simple circuit, which is composed of linear elements – resistor, inductance and capacitance, electric current is completely related to enforce sinusoidal voltage (of base frequency), so sinusoidal voltage responds to sinusoidal current. The load characteristic is the ratio between the enforced voltage and the responding load current. When the