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Hello,
I need to understand the impact of the lead power factor loads on the synchronous generators as i have a problem that sometimes a genset trips on "VAR import"&"gen bus overvoltage".
The plant has 2 x 1.25 MVA gas gensets and 1 x 1.25 MVA standby diesel genset. most of running loads are resistive loads as the plant is not totally commissioned yet: 2 thyristor controlled heaters = 2 x 250KW, resistive load bank = 750KW, lighting, UPS,....etc. the average power factor of the system is 0.96. Also i have a few questions.
1- Why does the gen trip on bus overvoltage?
2- Why does this trip accompanied by a very rapid frequency change which causes the UPS to disconnect the static bypass?
3- Is there a relation between the rapid change in load caused by the heaters and the generator trips?
4- Is there a possibility to reduce the total running machines power factor by adjusting the excitation?
Note: Machines are running in island mode (one in isochronous mode and the other is in droop mode).
I need to understand the impact of the lead power factor loads on the synchronous generators as i have a problem that sometimes a genset trips on "VAR import"&"gen bus overvoltage".
The plant has 2 x 1.25 MVA gas gensets and 1 x 1.25 MVA standby diesel genset. most of running loads are resistive loads as the plant is not totally commissioned yet: 2 thyristor controlled heaters = 2 x 250KW, resistive load bank = 750KW, lighting, UPS,....etc. the average power factor of the system is 0.96. Also i have a few questions.
1- Why does the gen trip on bus overvoltage?
2- Why does this trip accompanied by a very rapid frequency change which causes the UPS to disconnect the static bypass?
3- Is there a relation between the rapid change in load caused by the heaters and the generator trips?
4- Is there a possibility to reduce the total running machines power factor by adjusting the excitation?
Note: Machines are running in island mode (one in isochronous mode and the other is in droop mode).