Feb 5, 2016 #1 vipineng Electrical Jan 5, 2016 12 Will there be any difference in vacuum reading(in Macleod guage) while connecting the guage to top and bottom sampling valves of transformer??
Will there be any difference in vacuum reading(in Macleod guage) while connecting the guage to top and bottom sampling valves of transformer??
Feb 7, 2016 #2 collies99 Electrical May 28, 2010 198 The difference will be the head pressure of the oil. You can have negative pressure at the top but still have positive pressure at the bottom. All the side mounted pressure gauges that I have seen on sealed transformers are installed near the top, in the gas space. You can actually take an oil sample at the bottom under negative pressure at the oil head pressure is about .5 psi/foot? of oil head. Upvote 0 Downvote
The difference will be the head pressure of the oil. You can have negative pressure at the top but still have positive pressure at the bottom. All the side mounted pressure gauges that I have seen on sealed transformers are installed near the top, in the gas space. You can actually take an oil sample at the bottom under negative pressure at the oil head pressure is about .5 psi/foot? of oil head.
Feb 8, 2016 #3 prc Electrical Aug 18, 2001 2,008 No difference in vacuum reading whether read from top or bottom sampling valve. To my knowledge, we cannot use Macleod under oil. Upvote 0 Downvote
No difference in vacuum reading whether read from top or bottom sampling valve. To my knowledge, we cannot use Macleod under oil.
Feb 8, 2016 Thread starter #4 vipineng Electrical Jan 5, 2016 12 The transformer is not filled with oil.I was checking the pressure while vacuuming the unit Upvote 0 Downvote
