Dear all. I am Vivek mechanical engineer.

I found this website as I am facing a problem.

I have a 105 bar back presser gas turbine

   And

 12.5 MW -11 kv generator

 

Here I start from beginning that we done a turbine overhauling and then start turbine

 

Now what happen after baring and rolling we move to rated rpm at 7029 rpm. But as increase rpm from 1000 to 7029 in between near about 4000 rpm it will trip. So it is earth pole problem.

 

After that we changed diode then earth problem was no more .

 

There are 8 bearings. of which 7th & 8th are Gen Brg. 

Her problem is related to 8th brg. Which is generator NDE

 

But now what happens that at rated 7029 rpm there is no vibration on pedestal cover  at 8th in axial direction  as soon as  11kv voltage given the vibration at 8th in axial is 13.1 mm/s and after taking 2MW load vibration is 13.1 mm/s .

 

And one thing i note that when we remove cover from generator winding at 11kv  the axial vibration is 3.8 mm/s and as cover fitted on generator vib. in axial direction become 12.0 mm/s

 

So any one who phase this type of problem plz share with me..... 

 

 

Now what happen after baring and rolling we move to rated rpm at 7029 rpm. But as increase rpm from 1000 to 7029 in between near about 4000 rpm it will trip. So it is earth pole problem.

 

After that we changed diode then earth problem was no more .

 

There are 8 bearings. of which 7th & 8th are Gen Brg. 

Her problem is related to 8th brg. Which is generator NDE

 

But now what happens that at rated 7029 rpm there is no vibration on pedestal cover  at 8th in axial direction  as soon as  11kv voltage given the vibration at 8th in axial is 13.1 mm/s and after taking 2MW load vibration is 13.1 mm/s .

 

And one thing i note that when we remove cover from generator winding at 11kv  the axial vibration is 3.8 mm/s and as cover fitted on generator vib. in axial direction become 12.0 mm/s

 

So any one who phase this type of problem plz share with me..... 

 

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