It's generally intended to keep the generator terminal voltage relatively constant when the machine is operating in parallel with other generators. (Depending on many external factors, the generator terminal voltage may actually be seen to increase or decrease, but not by the same amount as if the generator were NOT operating in parallel with other generators.) When the generator is being operated in parallel with other generators the terminal voltage doesn't usually appear to change very much because of the effect of the system voltage which appears to keep the generator terminal voltage relatively constant.
When the generator is NOT connected in parallel with other generators, the generator terminal voltage will absolutely increase or decrease in direct proportion to the amount of excitation applied. At synchronous speed (which is what most synchronous generators should be operated at) which should be stable and for all intents and purposes fixed, when the excitation is increased the generator terminal voltage will tend to increase, and when the excitation is decreased the generator terminal voltage will tend to decrease. That's excellent you've read the fine manual.Ī synchronous generator's terminal voltage is a function of the amount of excitation applied to the rotor's windings. How the AVR system will be different in these two modes of operation? Brush AVR A-30) which i believe has not been discussed much in this forum. So i request the domain experts to give their views on AVR system (spec. So during Standby mode can we reset those limiter alarms etc which appeared during Main to Standby mode shifting? If it is voltage control then output voltage will be kept constant (depending upon the set value) irrespective of the load whereas in excitation current control the output voltage will not remain constant with varying load (this is what i believe).Īgain the shifting of control from Main to Standby will occur whenever there is U/V, O/V, U/E limiter or O/E limiter operated alarm etc appear in the MONITOR card.
Avr control unit manual#
What i have learned from the Brush manual for AVR A-30 is that in Main control mode we can select Voltage control, PF control and VAR control along with var shed whereas in Standby control mode we can select either Generator output voltage control or Excitation current control.
0 kommentar(er)
