GSU Vaccum Test
GSU Vaccum Test
(OP)
Ladies and Gentlemen
Has any body used Helium to do vacuum test on GSUs ? Can you please advise .
Thanks
Has any body used Helium to do vacuum test on GSUs ? Can you please advise .
Thanks
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RE: GSU Vaccum Test
RE: GSU Vaccum Test
RE: GSU Vaccum Test
RE: GSU Vaccum Test
RE: GSU Vaccum Test
RE: GSU Vaccum Test
As PRC said, we have used dry air or nitrogen for this purpose. Along with that, we used soap bottle solution (or "snoop") sprayed on suspect areas to look for bubbles. Also we tried ulstrasonic gun to listen for leaks but that didn't help... the soap bubbles worked but just had to do the work.
It makes sense that if you could put a tracer gas in there detectable by a very sensitive detector to help you zoom in on the area, you could make the job faster, at least it might help narrow down your search, then confirm it with bubble solution when you get close.
Helium is inert, so I can't imagine the transformer manufacturer would have any objection.... it won't interact with any seal materials or insulation materials if that's what you're worried about. Subsequent vacuum processing will clearly remove all traces before you put the oil back in an progress towards energization. There may be of course a human suffocation hazard, just like with nitrogen to be cognizant of, but that can be managed.
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(2B)+(2B)' ?
RE: GSU Vaccum Test
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(2B)+(2B)' ?
RE: GSU Vaccum Test
RE: GSU Vaccum Test
Transformer tank sealing is checked in two ways at site.One is pressure test with nitrogen or dry air at 3-5 psiand checking leak with soap solution.Then during vacuuming, pump is stopped at about 0.3kPa(2.3 torr).First vacuum reading is taken after one hour,say P1 torr and second reading after 30 minutes there after,say P2. Then leak rate of tank is (P1-P2)x oil volume in litres/time elapsed in seconds ie 30X60. Tank leak rate shall be less than 20 millibar litres/sec.