Votlage Regulator Sizing
Votlage Regulator Sizing
(OP)
I am a recent college graduate and was at a job site yesterday. Project involves automating voltage regulators at a small distribution substation. Per the namesplates, I copied down the following information:
Substation transformer bank is comprised of 3 single-phase transformers rated at 500 kVA each, 2400 V secondary. Secondary winding configuration is Wye solidly grounded with 4160 V line-to-line.
Substation regulators are comprised of 3 single-phase regulators rated at 125 kVA each, 2400 V.
If the entire feeder load is connected to the voltage regulators, why are they sized so much smaller than the substation transformers?
Substation transformer bank is comprised of 3 single-phase transformers rated at 500 kVA each, 2400 V secondary. Secondary winding configuration is Wye solidly grounded with 4160 V line-to-line.
Substation regulators are comprised of 3 single-phase regulators rated at 125 kVA each, 2400 V.
If the entire feeder load is connected to the voltage regulators, why are they sized so much smaller than the substation transformers?






RE: Votlage Regulator Sizing
RE: Votlage Regulator Sizing
RE: Votlage Regulator Sizing
Regulator technical data generally has a listing of standard ratings at each voltage level with both current and kVA ratings.
David Castor
www.cvoes.com
RE: Votlage Regulator Sizing
kVA rating on a voltage regulator is NOT the throughput.
It is the amount of energy being TRANSFORMED.
So a 125kVA regulator could handle 125/500 = 25% voltage adjustment (up and down) on the full load your 500kVA power xmfrs.
It is likely that the voltage regulating range they actually cover (you didn't say) is less than that.