M Farhadi Mahalli - Islamic Azad University, Noor Branch, Iran,
A Farhadi mahalli - Young Researchers Club, Islamic Azad University, Qaemshahr Branch, Iran

The increasingly trend of power electronic systems in trade and home appliances as well as harmonic-sensitive loads enhanced the harmonic in transmission and distribution networks. Thus in order to adjusting the model of power consumption and achieving these , some necessary actions should be done to reduce the harmonic which consequently, reduce the foreseen and unforeseen costs in application of electrical energy. Now increasing the level of harmonic and their undesirable effects is considered as one of the major problems in electrification system, therefore on the basis of standard, some restrictions on its level has been applied as coefficient in the dominant harmonic disturbance (THD). Therefore, identification all kinds of Harmonics and optimal methods of remove and reducing them to permissible level are essential. Hence in this study, various references for harmonic production in home uses has been analyzed that if power companies, in order to management and controlling this harmonics, don’t consider some principle for communication this kind of subscribers, their enhancement and intensification will cause irreparable damages to network equipments. Based on this, in this article, it's attempted to pay for studying the causes of existing harmonics that are composed of an infinite number of sine wave with different frequencies in nonlinear loads that is considered as the best reasons for saving the consumption of electrical energy. Finally, some practical principles are represented to avoid the losses of consumption in electrical energy and domestic uses and distribution networks of electricity and also improving the quality of electricity and preventing of losses caused by harmonics in the low voltage networks.

Consumption Patterns, Non-Linear Load,Low Voltage Networks, Harmonic Elimination, TotalHarmonic Distortion