Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Power Loss Analysis of Transformer Caused By Current Harmonics
Authors Seungyong Jang ; Sanghoon Han ; Jaeho Choi
DOI 10.6113/TKPE/2016.21.1.34
Page pp.34-41
ISSN 1229-2214
Keywords Current harmonics; Non-linear load; Transformer losses
Abstract This study investigates transformer losses caused by current harmonics. Electrical transformers are designed to work under sinusoidal voltage and current waves at a rated frequency. Recently, various nonlinear loads, such as power electronic converters, are connected to a power system; these converters generate current harmonics. Current harmonics increase power loss in transformers, which results in several problems, including temperature increase of the transformer and insulation damage. These problems will eventually shorten the operational life of the transformer. In this study, different types of losses caused by current harmonics in three-phase transformers are studied under linear and nonlinear load conditions. Linear loads are simulated and experimented on using pure resistance load, whereas nonlinear loads are simulated and experimented on using a three-phase twelve-pulse thyristor full-bridge rectifier. The different types of losses in three-phase transformers are evaluated analytically through the experimental result and simulation in PSiM.