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Anonymous Poster

oil leakage from transformer breather

08/24/2008 5:35 AM

Dear friends,

Recently, we charged a 22 KV / 0.433 KV distribution transformer of 1.25 MVA. For 24 Hours the transformer was on no load and everything was fine. Once the transformer was put on load (i.e., breaker of 1250 A feeder of power control center (PCC) was closed), oil started leaking from the breaker. Can someone please explain the reason. I have googled on it. But not found satisfactory answer

Regards

Prashanth Gaitonde
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Sparkstation
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New Zealand - Member - Interested in everything- see my Profile please APIX Pilot Plant Design Project - Member - Member Engineering Fields - Electrical Engineering - Member Engineering Fields - Power Engineering - Member Engineering Fields - Civil Engineering - Member Hobbies - Musician - Autoharp and Harmonica Hobbies - Hunting - Member Hobbies - Fishing - Member

Join Date: Nov 2007
Location: Christchurch, (The Garden City), South Island, New Zealand
Posts: 4395
Good Answers: 230
#1

Re: oil leakage from transformer breather

08/24/2008 6:05 AM

Hello "Guest",

Please advise make/model of OCB.

Please advise from exactly where on the OCB the oil was leaking.

Kind Regards....

__________________
 "The number of inventions increases faster than the need for them at the time" - SparkY
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Anonymous Poster
#2

Re: oil leakage from transformer breather

08/24/2008 1:34 PM

Oh Brotherrrrr! Sounds like something is overloading somewhere between the transformer and such switching device. Waaaoouuuhh... Better to review installation with spec. to determine what is wrong there my friends.

Lock and Tag,

MC

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dadw5boys
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Join Date: Feb 2006
Location: Piney Flats, Tennessee
Posts: 1740
Good Answers: 23
#3

Re: oil leakage from transformer breather

08/25/2008 4:35 AM

Too much toxic stuff in a transformer so I would not give you info that might in some way cause harm you or others.

__________________
 If you never do anything you never have problems.
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JB of NM
Active Contributor

Join Date: Apr 2007
Posts: 11
Good Answers: 1
#4

Re: oil leakage from transformer breather

08/25/2008 9:39 AM

Hello Guest,

If the load is within the 1.25 MVA rating, then I might suspect the problem MAY be that the transformer has too much oil in it. The oil will expand as it heats up under load. Check the load current, oil level, and oil temperature.

JB
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Sparkstation
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New Zealand - Member - Interested in everything- see my Profile please APIX Pilot Plant Design Project - Member - Member Engineering Fields - Electrical Engineering - Member Engineering Fields - Power Engineering - Member Engineering Fields - Civil Engineering - Member Hobbies - Musician - Autoharp and Harmonica Hobbies - Hunting - Member Hobbies - Fishing - Member

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Location: Christchurch, (The Garden City), South Island, New Zealand
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#7
In reply to #4

Re: oil leakage from transformer breather

08/25/2008 6:17 PM

Hello JB of NM

From the original Topic, as stated by "Guest": <"....oil started leaking from the breaker....">

Not from the transformer.

Kind Regards....

__________________
 "The number of inventions increases faster than the need for them at the time" - SparkY
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Anonymous Poster
#10
In reply to #4

Re: oil leakage from transformer breather

09/03/2008 2:05 PM

Dear JB of NM,

Thank you for your reply. After the joint discussion with our seniors in the dept., we came to a conclusion, which matches exactly with your reply.

Regards

Prashanth
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ragotham
Active Contributor

Join Date: Aug 2008
Posts: 15
#5

Re: oil leakage from transformer breather

08/25/2008 11:13 AM

Mr.Gaitonde,

Probably the transformer was not stored properly. Water must have entered the system and when the heat increases along with the load the water boils and pushes the oil out.

Best option now is to drain the transformer, fill with fresh oil and reuse the old oil after checking for water content.

Ragotham.
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Sparkstation
Guru
New Zealand - Member - Interested in everything- see my Profile please APIX Pilot Plant Design Project - Member - Member Engineering Fields - Electrical Engineering - Member Engineering Fields - Power Engineering - Member Engineering Fields - Civil Engineering - Member Hobbies - Musician - Autoharp and Harmonica Hobbies - Hunting - Member Hobbies - Fishing - Member

Join Date: Nov 2007
Location: Christchurch, (The Garden City), South Island, New Zealand
Posts: 4395
Good Answers: 230
#8
In reply to #5

Re: oil leakage from transformer breather

08/25/2008 6:18 PM

Hello ragotham

From the original Topic, as stated by "Guest": <"....oil started leaking from the breaker....">

Not from the transformer.

Kind Regards....

__________________
 "The number of inventions increases faster than the need for them at the time" - SparkY
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Anonymous Poster
#11
In reply to #5

Re: oil leakage from transformer breather

09/03/2008 2:20 PM

Dear Mr. Ragotham,

Thank you for the reply. It has provided a new dimension to our discussions here at site. Sorry for the spelling mistake in my querry. The word "breaker" in the main passage is to be replaced by "breather". Mr. sparkstation has objected regarding this.

Regards

Prashanth
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elnav
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Join Date: Dec 2006
Location: Western Canada
Posts: 1863
Good Answers: 39
#6

Re: oil leakage from transformer breather

08/25/2008 3:03 PM

RTFM !! - Read The Factory Manual

Did you stop at the right fill mark or fill it right full?

Expansion from heat created under load will cause expansion of the oil.

__________________
 Elnav
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Anonymous Poster
#9

Re: oil leakage from transformer breather

09/02/2008 2:03 AM

Hi,

Foa ny transformer once if you load the transformer, due to internal heat developed the oil level rises up. But leakage through breather may look stange. In normal case the breather is taken from the conservator. May there be leake in the piping from the Transformer Coservator to the breather pipe.

Regards,

N.Suresh
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Users who posted comments:

Anonymous Poster (3); dadw5boys (1); elnav (1); JB of NM (1); ragotham (1); Sparkstation (3)

Previous in Forum: SF6 GAS LAEK INTO 400/132KV POWER TRANSFORMER SUSPECT   Next in Forum: MOTORS REWINDING

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