corona problems on a 8 MW leroy sommer generator
corona problems on a 8 MW leroy sommer generator
(OP)
hi, i must do a cleaning on a 8 MW leroy sommer generator, and the guys send me a report of a thermographic of the generator, showing some hot spot in the head of the windings, they said that is a corona effect problem.... how do you see, does corona effect causing this hot spots?
on other way, maybe i need to use a new stress grading tape for the head of the windings? how would you start this work? they want to clean the machine... and the machine is open design, and is in cement factory, and maybe the winding are full of cement.
thanks for your always helply opinion
on other way, maybe i need to use a new stress grading tape for the head of the windings? how would you start this work? they want to clean the machine... and the machine is open design, and is in cement factory, and maybe the winding are full of cement.
thanks for your always helply opinion





RE: corona problems on a 8 MW leroy sommer generator
So this seems like a challenging application for infrared thermography imo. But never say never.
For detection of tracking on insulators in the T&D world, the device which tremendously outperforms infrared thermography is ultraviolet scanning. Detecting corona by ultraviolet creates a much higher signal to noise ratio since there are not many other things going on (besides corona, tracking, partial discharge) that create much energy in the higher frequency range of uv.
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RE: corona problems on a 8 MW leroy sommer generator
If it is tracking between phases in the endwindings well beyond the grading (where it should be at full phase voltage), then changing grading would do nothing to help.
Only if it appears as tracking back toward the slot section would improved grading have a chance at reducing the alleged tracking.
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RE: corona problems on a 8 MW leroy sommer generator
thanks for your nice help..... i sorry but report is on english but you could see pics
RE: corona problems on a 8 MW leroy sommer generator
RE: corona problems on a 8 MW leroy sommer generator
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RE: corona problems on a 8 MW leroy sommer generator
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: corona problems on a 8 MW leroy sommer generator
RE: corona problems on a 8 MW leroy sommer generator
RE: corona problems on a 8 MW leroy sommer generator
RE: corona problems on a 8 MW leroy sommer generator
RE: corona problems on a 8 MW leroy sommer generator
What about doing a corona scan if you are concerned?
What is the voltage?
RE: corona problems on a 8 MW leroy sommer generator
What´s a corona scan? how this work?
RE: corona problems on a 8 MW leroy sommer generator
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *
RE: corona problems on a 8 MW leroy sommer generator
Corona scanning is a new technology used mostly by utilities but is starting to become very popular in industrial plants.
A special camera is used that makes the light in the UV spectrum. We do these daily and have been very successful in industrial plants on MV equipment.
I have attached a couple of images from a scan we did last month.