S
Hello folks,
I am experiencing something crazy with a AVR controlling a 12,5 MVA generator in a petrochemical plant.
When I am sending +Exc order from the local screen of the excitation cabinet the Field current and the stator voltage increase but the MVAr power decrease. We noticed the opposite for -Exc order, the Field current and stator voltage decrease but the MVAr power increase.
Excitation and protection cabinet are both new.
At first, I thought that the CT coming to the AVR was inverted, but it doesn't make sens because we should have a negative active power too.
In my opinion a 180° on the CT's would impact both active and reactive power. I checked the active power on the protection relay which are not measured by the same set of CT's and we are in line with the Active power measured by the AVR.
When the unit is synchronised while in Voltage regulation mode the system work even if the reactive power is inverted. However, if we switch in MVAr regulation the system goes crazy as the MVAr power measured will never reach the setpoint. It's going in the wrong way.
If someone already experienced such matter, please feel free to share your experience.
Thank you.
Saul
I am experiencing something crazy with a AVR controlling a 12,5 MVA generator in a petrochemical plant.
When I am sending +Exc order from the local screen of the excitation cabinet the Field current and the stator voltage increase but the MVAr power decrease. We noticed the opposite for -Exc order, the Field current and stator voltage decrease but the MVAr power increase.
Excitation and protection cabinet are both new.
At first, I thought that the CT coming to the AVR was inverted, but it doesn't make sens because we should have a negative active power too.
In my opinion a 180° on the CT's would impact both active and reactive power. I checked the active power on the protection relay which are not measured by the same set of CT's and we are in line with the Active power measured by the AVR.
When the unit is synchronised while in Voltage regulation mode the system work even if the reactive power is inverted. However, if we switch in MVAr regulation the system goes crazy as the MVAr power measured will never reach the setpoint. It's going in the wrong way.
If someone already experienced such matter, please feel free to share your experience.
Thank you.
Saul