| Title |
Study on Voltage Drop and Transformer Capacity During Induction Motor Direct on Line Starting |
| Authors |
Jong-Gyeum Kim ; Young-Jeen Park |
| DOI |
http://doi.org/10.5207/JIEIE.2022.36.3.013 |
| Keywords |
Induction motor; NEMA code letter; Starting current; Transformer capacity; Transformer impedance; Voltage drop |
| Abstract |
The biggest disadvantage of an induction motor is that the voltage drop is large due to the high current during startup. Voltage drop is an electrical and mechanical problem for the motor itself, but it can also be a major problem for other connected loads. Therefore, it is necessary to limit the voltage drop within a certain range. Transformer capacity is a factor that greatly affects the voltage drop when starting an induction motor. If the capacity of the motor is more than a certain size among the loads connected to the transformer, it is necessary to examine the voltage drop. In this paper, after calculating the capacity of the transformer corresponding to the permissible range of the voltage drop, we analyzed how the voltage drop varies according to the value of % impedance. As a result of the analysis, it was found that increasing the transformer capacity is effective to reduce the voltage drop, and it is more advantageous to lower the% impedance even for a transformer of the same capacity. |