Abstract ▼ AI-Helper

This thesis investigates the transformer losses caused by current harmonics. Nowdays various non-linear loads such as power electronic loads are connected power system. Electrical transformers are designed to work under sinusoidal voltage and current waves at the rated frequency. Recently various no...

This thesis investigates the transformer losses caused by current harmonics. Nowdays various non-linear loads such as power electronic loads are connected power system. Electrical transformers are designed to work under sinusoidal voltage and current waves at the rated frequency. Recently various non-linear loads such as power electronic converters are connected power system, and these converters generates current harmonics. Current harmonics lead to increase of power loss of transformer. The increase of the power loss leads to several problems including the temperature rise of the transformer, insulation damage. Eventually, these problems decrease the operational life of the transformer. In this thesis, different type of losses due to the current harmonics in three phase transformer are studied under linear and non-linear load condition. The linear loads are simulated and experimented by a pure resistance load and the non-linear loads are simulated and experimented by a three phase 12-pulse thyristor full bridge rectifier. The different type of losses of three phase transformer are evaluated analytically by experimental result and simulation in PSiM.