Heat
- Thread starter Mico
- Start date
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Fulthrotl
~Autocorrect is My Worst Enema.~
- Occupation
- E
my 13200 / 7620 KV Y transformer emits abnormal heat even it is underloaded at 30% loading can anybody help me? if i cannot solve this i might be terminated!!!
how about some particulars? mfg., oil type, when last bowsered, etc?
eric9822
Senior Member
- Location
- Camarillo, CA
- Occupation
- Electrical and Instrumentation Tech
Define Abnormal please.
Buck Parrish
Senior Member
- Location
- NC & IN
my 13200 / 7620 KV Y transformer emits abnormal heat even it is underloaded at 30% loading can anybody help me? if i cannot solve this i might be terminated!!!
Throw it out and get a new one. Problem solved.
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
More questions.
Where is the excess heat, the radiators, the bushings, or the tanks? How are you measuring the heat, just looking at the temperature guage?
Where is the excess heat, the radiators, the bushings, or the tanks? How are you measuring the heat, just looking at the temperature guage?
Cold Fusion
Senior Member
- Location
- way north
"abnormal" definitely needs to be quantified.
I've seen a few cases of "abnormal" heat with properly loaded transformers that can be attributed to their not being level and having an oil flow problem.
In one case there was blockage in the oil path to some of the "fins"
I've seen a few cases of "abnormal" heat with properly loaded transformers that can be attributed to their not being level and having an oil flow problem.
In one case there was blockage in the oil path to some of the "fins"
zog
Senior Member
- Location
- Charlotte, NC
Thats what I am guessing too, common problem to have restricted flow in the fins, should look like this.
zog
Senior Member
- Location
- Charlotte, NC
No, I said it should look like that
this was outside in winter in Michigan, ambeient was around freezing.
Right
I had similar concerns on a transformer install I did... it was just too hot to touch. I read 286?F is some places. Contacted the manufacturer, and they said that's normal.
Now THAT's hot. Get the Brats.
db
Fulthrotl
~Autocorrect is My Worst Enema.~
- Occupation
- E
bowsering is the process of pulling a vacuum on an oil filled xfmr,
and circulating the oil thru a "bowser", which is a water separator,
filter media, and heating assembly.
the purpose is to lower the dew point of any moisture remaining
in the oil, by increasing temperature, and lowering pressure, to
cause the water to boil off.
at the same time, the oil is filtered of particulate matter. it is sometimes
called "polishing" the oil.
the process continues until oil samples being tested, come back
clean and dry enough to satisfy the powers that be. i've gotten stuck
on a difficult one that ran a week and a half.... energy pumped into the
oil as heat normally require 200a. of 480vac. the one i did had the xfmr
at 178 degrees for a week, and that was 35,000 gallons of oil.
it's a pain in the butt. 12 on, 12 off, for 12 days, and i had 6pm to 6am.
I agree. The manufacturer should be able to provide a test sheet with losses and designed winding and oil temperature rises.I had similar concerns on a transformer install I did... it was just too hot to touch. I read 286?F is some places. Contacted the manufacturer, and they said that's normal.
I think that should be the starting point.
zog
Senior Member
- Location
- Charlotte, NC
The max rise limits are on the nameplate, if they are exceeded life expentancy decreases dramaticly.
Not sure what ever happened, as I sent my test results to the factory.
The clowns in the office (I was working for wages then) took it from there. AFAIK, nothing ever happaned to it.
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Any chance you are dealing with a major harmonics issue?
brian john
Senior Member
- Location
- Leesburg, VA
- Status