StruggleEngr
Electrical
- Oct 29, 2021
- 5
Hello All,
I am a field engineer at a complex that serves multiple manufacturing buildings. My group is responsible for the 12.47kV overhead distribution to the building service entrance equipment, including the transformer (Delta-Wye XFMR).
Three manufacturing buildings are experiencing overvoltage trips on their AB PowerFlex 525 VFDs. Since the trips are several buildings around the same time (the morning), we got called up because there is a concern for utility power quality issues.
The overvoltage fault could be several possible issues from building transformer, harmonics, transient voltages, etc. I am reaching out to the collective to get ideas on what I should check and bounce some of my team's ideas. I think a lightning arrester is failing on one of the 12.47kV distribution poles, and there is an intermittent ground fault. But I am unsure how an intermittent ground fault would cause an overvoltage trip on the VFDs.
Thanks!!
I am a field engineer at a complex that serves multiple manufacturing buildings. My group is responsible for the 12.47kV overhead distribution to the building service entrance equipment, including the transformer (Delta-Wye XFMR).
Three manufacturing buildings are experiencing overvoltage trips on their AB PowerFlex 525 VFDs. Since the trips are several buildings around the same time (the morning), we got called up because there is a concern for utility power quality issues.
The overvoltage fault could be several possible issues from building transformer, harmonics, transient voltages, etc. I am reaching out to the collective to get ideas on what I should check and bounce some of my team's ideas. I think a lightning arrester is failing on one of the 12.47kV distribution poles, and there is an intermittent ground fault. But I am unsure how an intermittent ground fault would cause an overvoltage trip on the VFDs.
Thanks!!