We have three Gas Turbine Generators (GTGs) of the GE (LM2500+G4) model in parallel, each with a site rating of approximately 27.5MW.
Inquiring about the maximum acceptable step load for this type of GTG, I reached out to GE for guidance and yet to get a response. However, I'm seeking additional insights here as well.
a) Typically during testing, we conduct load step increments using the load bank controller at 10-minute intervals, gradually increasing the load to achieve a rated Generator loading of 10%→25%→50%→75%→100%.
b) Nevertheless, the operational test procedure, particularly for load acceptance transient response tests and 4-hour load tests, dictates applying load increments from 0% to 50% and then 50% to 100%. It's important to note that speed transients should not exceed 10% and should recover to within 1% within 5 seconds, while voltage transients should remain within -15% to +20% and recover to within +/- 3% within 1.5 seconds.
Therefore, based on approach (a), the maximum step load would be 25%, whereas following approach (b) would entail a maximum step load of 50%.
Currently in PMS, the motor start inhibit function is based on spinning reserve, so when one GTG is running with a load of say 4MW, based on spinning reserve it can even start a 15MW motor. Can GTG be operable within the limits as mentioned in b) above.
Inquiring about the maximum acceptable step load for this type of GTG, I reached out to GE for guidance and yet to get a response. However, I'm seeking additional insights here as well.
a) Typically during testing, we conduct load step increments using the load bank controller at 10-minute intervals, gradually increasing the load to achieve a rated Generator loading of 10%→25%→50%→75%→100%.
b) Nevertheless, the operational test procedure, particularly for load acceptance transient response tests and 4-hour load tests, dictates applying load increments from 0% to 50% and then 50% to 100%. It's important to note that speed transients should not exceed 10% and should recover to within 1% within 5 seconds, while voltage transients should remain within -15% to +20% and recover to within +/- 3% within 1.5 seconds.
Therefore, based on approach (a), the maximum step load would be 25%, whereas following approach (b) would entail a maximum step load of 50%.
Currently in PMS, the motor start inhibit function is based on spinning reserve, so when one GTG is running with a load of say 4MW, based on spinning reserve it can even start a 15MW motor. Can GTG be operable within the limits as mentioned in b) above.