The causes and effects of the harmonic in power system transmission line
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Date
2019-06
Authors
Ahmad Fitri Bin Md Jusoh
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Abstract
Harmonics has effect on transmission line in various ways. It could make the resistance increases due to skin effect. Additional harmonic current increases copper loss of transmission system and reduce power transmitting capacity. Furthermore, harmonic current produces harmonic voltage drops across various circuit impedances. As a result, a weak system of large impedance has low fault level and greater voltage disturbances where as a stiff system of low impedance has high fault level and lower voltage disturbance. Harmonic voltage increases dielectric stress of cables used in transmission line. The dielectric stress is proportional to their crest voltages. This reduces dielectric strength. This results in shortening of the useful life of the cable and probability of the number of faults. Finally, the occurrence of corona will be happened. Corona starting, and extinction levels depend on peak to peak voltage. The peak voltage depends on the phase relationship between the harmonics and the fundamental. Harmonic voltage increases peak to peak voltage. It may happen that the peak voltage is above the rating while the RMS. voltage is well within this limit. These are the factors that lead to the importance of this project. This project is focusing on the causes and effects of the harmonic in power system especially in transmission line. The simulation is developed using a MATLAB/SIMULINK program to analyse the occurrence of harmonic. Harmonic in power system was becoming the big problem if not handle with carefully. Harmonic was growing very quickly in recent years because of the increasing of the nonlinear load in power system. Harmonic sources are difficult to control, and it has distributed widely. It can affect a lifetime of the equipment and bring the safety factor to the grid operation.