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Bill... How does auto-sync compare to doing it manually? Regards, Phil Corso

Engr... Reur 29-May-14 post,"Can u explain please what happen in reality?" Are you still interested in the calculation? Regards, Phil Corso

CSA... "At this point, the person observing the starting motor current should also be asked to report the current value..." A motor's starting or "breakaway" torque is determined by the motor's parameters! Hence starting-current does not vary for most of the runup duration!

CB... yes, the primary-side PF will change, but not because of phase-shift. Instead, the change is influenced by the Xfmr's Cu and Fe losses! These losses, when added to the load's parameters, will 'slightly' change the primary PF! Using your example of a 1 MVA, 0.8 PF load, connected to...

Thanks you FluidFlow, I finally reached 80! Clearly it feels like two 40's. I'm still active enough to help others, so if anyone wants to avail themselves of 60+ years of Electrical Power experience, contact me at: [email protected] Best Regards to all, Phil Ps: If anyone wants...

Engr, Was the answer adequate, or not, for your purposes? Phil

Sorry, CSA... The poster provided enough information for the study, except for alternator efficiency! If you believe my student’s guesstimate of efficiency is in error, then please be good enough to provide a value you may have learned during your career. Phil

Sorry, CSA... it's all your getting. I must admit, however, that we are somewhat equal... I know as much about gas-turbines as you know about electricity. How long have you been involved with your avocation? Regarding electricity, my student is willing to tutor you. Best to you, Phil

CSA... so is it your position that the solution to Engr's query boils down to application of "Significant Figures?" Phil

CSA... considering your admitted disdain for academia, I thought you might accept a university student’s answer. So I assigned the task to my students. Following is the winner’s solution: Start of Student Study 1) This study will show that changing an alternator’s load-PF (hence its...

Hameed... are you applying a specific Brand-Name Protective Relay? Regards, Phil Corso

Jasoin... The ANSI/IEEE-Std supports your contention regarding Vertical Segregation of Data "Transmission" cables and power cables. The conflict arises because the API-std fails to prescribe what is represented by "Hi-Voltage!" construction. Regards, Phil

Jasoin... I suggest you procure: ANSI/IEEE Std 422-1986 "Guide for the Design and Installation of Cable Systems in Power Generating Plants" Regards, Phil Corso

Amrit... i) If load varies +)/(-) 10%, then RMS-load calcultaion, involving duration of operation at each level, should be performed! iia) PF is never given as a Nameplate parameter! Operating at 1.05pu load and 0.8 PF is quite acceptable. But, success depends on load-duration! iib)...

JFB... Differentiation. Phil

JFB... thank you for pointing out my error, i.e., failing to note micron measurement was displacement, and not velocity! Phil

Balsubramanian... mm/s = μm / 1,000 Regards, Phil Corso

CSA... I believe you will agree that if load MW is constant so is fuel-rate. Paraphrasing the poster's query, "while maintaining a 40MW load, will a change in the load's MVAr component affect fuel-rate?" I now realize my mistake. Of course it will "influence" fuel-rate, but, to what...

CSA... I take it then, you won't object to my using formlae? Regards, Phil Corso

Eng... the simple reply to your query is : If one ignores losses, then neither lag nor lead MVAr wii influence fuel rate! Regards, Phil Corso