Transformer Oil Leakage

I'm not, I might get dirty.

You don't say where you are, how do you expect help?

It sounds in a dangerous state so contact the manufacturer.

Your description does not make it clear where exactly the leak is. If it is on the bushing where it passes into the main tank then the transformer oil should be drained to below the bushing level, after isolating and earthing the unit, and the bushing or it's gaskets and seals replaced.

If the leak is on a weld in the main tank itself then isolate and earth the unit, drain all the oil out of the main tank and repair the weld after making sure that it is safe to use a grinder and welding plant. After repairs, thoroughly clean the tank to clear it of metal splinters and weld spatter before replacing with clean oil or purified oil.

Before re-energising the transformer test the oil to ensure it conforms to BSS BS 148:1772

Water content less than 10 mg/kg (IEC 814)

Dielectric strength 70 kV (minimum) (IEC 156)

And to add to what Forbes has said, do not attempt to do this work yourself unless you are qualified and know what you are doing! Contamination of the transformer oil during draining and refilling can lead to an internal fault. Failure to keep moisture out of the windings while the oil is out of the tank is also a major concern. Improper welding of the transformer tank could cause worse leaks than you have now. If the unit is still under warranty, you probably will void that warranty if you do the work yourself rather than have the manufacturer do it. So it's best to contact the manufacturer (if under warranty), or a qualified high-voltage service firm (if not warrantied) for the work. They will also be able to test the transformer after the work is done to tell you that it is good to be re-energized.

I know this is an old post but I wanted to offer my 25 plus years of experience in locating

and repairing transformer oil leaks and SF6 gas. www.coltpowerservices.com

Jim Hackett

804-938-6559

1. Check the manufacturer nameplate and the related documentation to see if it is within waranty period.

2. If it is not, check who is in charge of oepration this substation. Confirm them about the problem and ask for the maintenance crew to the site.

3. If number 2 is failed. Then, contact manufacturer for advice. Dont decide things yourself.

My company repairs transformer oil, nitrogen and SF6 gas leaks without draining or depressurizing the unit. We have completed over 11,000 guaranteed repairs during the past ten years. We provide this service in the United States and Canada, if you are intrested visit us at www.coltonline.com and then select Power Services Division.