Solutions on Undervoltage on Bus

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adamscb

Senior Member
Location
USA
Occupation
EE
I would double-check your transformer taps are set-up correctly, along with incoming utility voltage
 

kingpb

Senior Member
Location
SE USA as far as you can go
Occupation
Engineer, Registered
Your SLD is not coming through.

I would Address the feeders to the 6.9kV bus to raise voltage, first. Check the taps on the transformer screen and make sure you are adjusting properly. They are typically on the LV windings so the "-" taps will cause the voltage on the LV side to rise. Thus using the -5% tap will raise your 6.9KV. Once you do this, you may or may not need to adjust taps on the 6.9kV-400V transformers; but if needed to can do it on those as well.

Word of caution, is make sure you run analysis on the system under no-load or lightly loaded conditions to confirm you don't have an over voltage situation.
 
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