Abstract: This paper will discuss about impact ofnonlinearload in residential costumer to harmonic distortion.Electricityconsumerbehaviourparticularlyinthe household sectorwith the development oftechnology willevolve.Equipment usedforeveryday purposescontinues to growandhas become alifestyle.Themodern life isbecoming fabulous with the invention of new technology, so that many more electricity utilities are used bypeople and their houses in daily life. Nowadays, loads in the housing electricity utility do not onlycontain oflinier loads, but also non-linier loads such as television, computer, microwave, fluorescent lamp and so on. Theproblem usesnonlinearload is create harmonic distortion. The harmonic distortion will reduce the life time ofelectrical equipment and inefficiency. The purpose of this research is to domodellingand prediction ofharmonics level on housing electricity utility. Themodellingand prediction of this research was usingharmonicanalysiswith ETAP PowerStation version 4.0.0 C. This experiment was done in five houses as sample. Themeasurement was done on non-linier load and Kwh-meter in every house using Fluke 41B. The result ofmeasurement on Kwh-meter on houses was compared in order to get the analysis result for VTHD, ITHD,power factor and frequency. The results research showed that VTHD, power factor (PF) and frequency onhouse are comply to the normal standard. VTHD result (maximum 5) is1.1–3.6.Beside those, ITHD onhouse also comfortable to due standard, but there are housees that did not comply into the appointed standard.The analysis result showed that energy saving lamp cause the biggest harmonics level. The level of harmonics inevery house depends on how many electricity equipment used in it
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