| Title |
Study on the Calculation of Appropriate Transformer Capacity According to the Increase in the Starting Current of Induction Motor |
| DOI |
https://doi.org/10.5370/KIEE.2025.74.10.1665 |
| Keywords |
Efficiency; Induction motor; Starting Current; Transformer Capacity; Voltage Drop |
| Abstract |
The most representative electrical device that accounts for approximately 60% of electricity consumption is the electric motor.
Accordingly, international standards for motor efficiency(IE) have been continuously upgraded to enhance energy efficiency. As the efficiency of motors increases, the proportion of inductance in impedance decreases, so the current during starting is larger than before. The increase in current when starting the motor can have a significant effect on the voltage drop. Therefore, it is necessary to select a transformer capacity that allows stable operation within the allowable range of voltage drop. Recently, transformers tend to be selected close to the available motor capacity to reduce losses during no-load or light-load operation.
In this study, considering the recent increase in the starting current ratio due to the high efficiency of electric motors, a comparative analysis was conducted to determine the appropriate transformer capacity within the allowable voltage range. |