AVR panel in generating stations
AVR panel in generating stations
(OP)
We have a thermal power plant with a multi-megawatt generator of 15 kV voltage. It is connected to the grid through a 15/400 kV transformer. Definitely, the generator has its own AVR system. But I wonder if it is also necessary to have an AVR panel for the 15/400 kV transformer?
In transmission substations, transformers are equipped with tap changer and AVR. But this is a "generating station" where the (generated) voltage is regulated by the generator's AVR.
Also note that the transformer is also used at times when the generator is shut down, to transform 400 kV voltage from grid to supply the house load of the power plant.
Thank you in advance
In transmission substations, transformers are equipped with tap changer and AVR. But this is a "generating station" where the (generated) voltage is regulated by the generator's AVR.
Also note that the transformer is also used at times when the generator is shut down, to transform 400 kV voltage from grid to supply the house load of the power plant.
Thank you in advance






RE: AVR panel in generating stations
Depending on how tight the voltage tolerance is for the house load supplied when the generator is off line, you either may or may not require on load tap changing facilities in the generator step up transformer.
It may be possible to use a GSU transformer with off load/off potential tap changing, provided that either [a] the generators can carry the local load while the transformer taps are being changed or [b] there is an alternate means of supplying the load, or [c] if the house load is interruptible for the short duration of the outage...
Beware that when the generator is on line, depending on voltage regulating schemes and/or operating set-ups, there is a distinct possibility that the GSU tap control system and the generator AVR may fight each other, and it may be necessary to place and leave the GSU [on-load] taps on manual, adjusting them as needed.
CR
"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]
RE: AVR panel in generating stations