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@prc What I mind is the bushing been more aggressive affected by VFTO than it would be without the impedance connected on the capacitive tap.

Does anybody know something about NOT TO BE RECOMMENDED to use bushing monitoring system through capacitive tap in transformer connected to an GIS? The restriction I'm talking about would be due the relationship between VFTO and the impedance add to the bushing tap. Thanks Anderson Beltrame

Hi, Attached goes a picture of a 500kV CVT oil indicator (one of two capacitors) which doesn't show any presence of insulator oil but it is working without any issue. My question is: Was I supposed to see oil in there or its just to see something inside ...

What do you think about PD monitoring in GIS (525kV? Realiable or just on more source of doubt? can you tell us a good one manufacture? Thank you!! Anderson.

Sorry, steam turbine

Hi everybody How long does it take for a gas turbine 35MVA generator full load motorize, considering zero time when the steam inlet valve is fully closed? I would like to know only an estimate time, not exactly

DPC, thank you a lot !!! this book is really great and it´s gonna help me with this and many others daught. Thank you one more time!!

DPC, excuse me if I did not clear, but what I'm looking for is a methodology that teaches how to calculate a transformer grounding for generators. I could calculate the power transformer considering steady state, which would be very easy. But I what I have read shows that the grounding...

Any of you could help me to find out how to calculate a grounding transformer to a generator ?

Thanks Everybody, Especially to byrdj !!

thanks everybody

Thanks everybody !!!

I have read that in order to avoid blade ressonace and it´s efects, a steam turbine operating conected to a system must be removed from there if a underfrequency condition is present (for example 58 Hz in a 60Hz system). The books also says that these effects are cumulative. My question is: in...

tanks !!

Well, let me explain better... I have read that in order to avoid blade ressonace and it´s efects, a steam turbine operating conected to a system must be removed from there if a underfrequency condition is present (for example 58 Hz in a 60Hz system). The books also says that these effects are...

I have read that in order to avoid blade ressonace and it´s efects, a steam turbine operating conected to a system must be removed from there if a underfrequency condition is present (for example 58 Hz in a 60Hz system). The books also says that these effects are cumulative. My question is: in...

Steam turbine blades are designed and tuned for operation at a rated frequency rotation. So, under and overfrequency protection, especially underfrequency, are used to prevent blade ressonance and fatigue damage in the turbine when it´s runinng with load (system conected) out of frequency range...