The rapid development of technology in the field of power electronics over the last few decades has resulted in the increasing use of power electronic devices in household appliances. This has the potential to contribute harmonics to the electric power distribution system. The purpose of this study is to obtain the harmonics generated by the housing load and its effect on increasing power losses in the secondary distribution feeder. The housing load and secondary distribution network have been modeled using ETAP Power Station 19.01.1 software. To illustrate the actual situation, the operation of residential loads has been combined between linear loads and nonlinear loads, so that the Total Harmonic Distortion Current (THDi) can vary up to 40%. From the simulation results and calculations, the total power loss without harmonics is 1,009.77 watts and the total power loss at 40% THDi is 1,195.23 watts. The increase of power loss due to THDi 40% is 185.46 Watts or 18.4%. So, the higher THDi, the power losses in the secondary distribution feeder also increase.
