| Title |
Research on Changes in Induction Motor Torque Characteristics due to Distribution Line Ground Resistance during Single-Line Ground Fault |
| DOI |
https://doi.org/10.5370/KIEE.2022.71.10.1518 |
| Keywords |
Induction motor; Ground resistance; Single-line to ground fault(SLGF); Torque ripple; Voltage drop |
| Abstract |
Customers should be provided with good quality of electricity for stable load operation. Various failures can occur from substations and distribution lines to consumers. The most common failure in distribution lines is single-line ground fault. For distribution lines, grounding resistance is stipulated according to the length of the line and installation conditions. When single-line ground fault occurs, the magnitudes and phase angles of voltage and current change asymmetrically, resulting in unbalance. Three-phase induction motors among customer facilities are greatly affected by these voltage and current imbalances. Imbalance of current and voltage caused by a fault can have a great effect on the torque of the motor.
In this study, we analyzed how the pulsating torque of an induction motor appears according to the ground resistance of the line during single-line ground fault in a distribution line. It was confirmed that the higher the ground resistance of the distribution line, the lower the amplitude of the pulsating torque. |