vinod
Senior Member
- Location
- Saudi Arabia
We have energized a 480V distribution panel yesterday. When we measured the voltage between Phase to ground (neutral), we got an unbalanced readings.
reading as follows;
Phase A to Ground >>>>326V
Phase B to Ground >>>>241V
Phase C to Ground >>>>287V,
however, the line voltage readings are balanced. ie 480-490v.
The nominal voltage between Phase to ground is 277V. we found this information on transformer name plate.
Please explain, What could be the cause of this unbalanced phase voltages?
reading as follows;
Phase A to Ground >>>>326V
Phase B to Ground >>>>241V
Phase C to Ground >>>>287V,
however, the line voltage readings are balanced. ie 480-490v.
The nominal voltage between Phase to ground is 277V. we found this information on transformer name plate.
Please explain, What could be the cause of this unbalanced phase voltages?