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Regarding the harmonics of AC current, when the AC phase is connected to the rectifier it will cause harmonics to appear on the AC line. In addition, this rectification process requires a large enough capacitor if you want to reduce the voltage ripple from the rectification result. The larger the capacitor, the smaller the ripple, but the higher the cost of the capacitor. So the author chose the title of the final project «Design of Electrical Power Transformation from 3 Phase to 9 Phase System Using an Iron Core Transformer. Problem Formulation How to design a multi-phase transformer, especially a 3-phase to 9-phase transformer. How to design a multi-phase transformer construction. For multiphase transformers, especially transformers from 3 phases to 9 phases, 3 single phase transformers can be used which have one coil on the primary side and 5 coils on the secondary side. To get a voltage on phase 2 with the same amplitude of 100 volts with phase 1 only 40 degrees different in phase, then a voltage of 113 volts on phase 1 with a phase angle of 0 degrees, plus a voltage on phase 4 of 74 volts with a phase angle 120 degrees. Then to get a voltage on phase 3 with the same amplitude of 100 volts, it takes a voltage of 74 volts on phase 1 with an angle of 0 degrees, plus a voltage on phase 4 of 113 volts with a phase angle of 120 degrees. trying to make this 3 phase to 9 phase transformer by using the construction of 1 3 phase transformer. do the calculation of the transformer power that will be designed.

PERANCANGAN TRANFORMASI DAYA LISTRIK DARI SISTEM 3 PHASA KE 9 PHASA MENGGUNAKAN TRANSFORMATOR BERINTIKAN BESI