Fulthrotl
~Autocorrect is My Worst Enema.~
- Occupation
- E
i've got three different facilities with power issues,
or suspected power issues.... so i'm looking at
renting a fluke 435 for a month......
anyone have suggestions on something better?
got a "drive by and look at it" call yesterday, from
two different customers with three different facilities.
odd enough i was wondering if it's a full moon..
same complaint in each. "loud transformer humming."
first one i got to, no kidding..... 50' away, down a hallway
from the electrical room, you heard this weird humming...
went inside the electric room, 300 kva dry type xfmr, sounding
like it wanted to grenade on the spot.... transformer is spec'd
at 55 db at full load, this one is measuring 82 db, 6' away from
front of unit.
but the iphone app i was using, is a spectrum analyzer, and
considering what it is, fairly accurate... and it showed this
weird low frequency oscillation about twice a second... the
125 hz line was double the rest of the spread, but the frequencies
below that were surging up to 80 db and falling off to 40 db.
sounded like the soundtrack for a bad science fiction movie,
right before some evil spacecraft lands and horrible things
happen... :-/
anyway, anyone have equipment and troubleshooting suggestions?
i'm gonna do a PM on the xfmr's with a megger, to at least make
sure it's not about to grenade, but suggestions would be appreciated.
thanks
or suspected power issues.... so i'm looking at
renting a fluke 435 for a month......
anyone have suggestions on something better?
got a "drive by and look at it" call yesterday, from
two different customers with three different facilities.
odd enough i was wondering if it's a full moon..
same complaint in each. "loud transformer humming."
first one i got to, no kidding..... 50' away, down a hallway
from the electrical room, you heard this weird humming...
went inside the electric room, 300 kva dry type xfmr, sounding
like it wanted to grenade on the spot.... transformer is spec'd
at 55 db at full load, this one is measuring 82 db, 6' away from
front of unit.
but the iphone app i was using, is a spectrum analyzer, and
considering what it is, fairly accurate... and it showed this
weird low frequency oscillation about twice a second... the
125 hz line was double the rest of the spread, but the frequencies
below that were surging up to 80 db and falling off to 40 db.
sounded like the soundtrack for a bad science fiction movie,
right before some evil spacecraft lands and horrible things
happen... :-/
anyway, anyone have equipment and troubleshooting suggestions?
i'm gonna do a PM on the xfmr's with a megger, to at least make
sure it's not about to grenade, but suggestions would be appreciated.
thanks