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2 comments
Commentator

Join Date: Nov 2009
Posts: 88

Leakage on Transformer

05/10/2012 3:29 AM

I have a transformer that is leaking transformer oil profusely,I think it's leaking from the tap changer. after doing a standing leak test, do you think it is appropriate to drain the oil completely and do an internal inspection of the tank? the client said he only wants me to drain 6o%.

The transformer is hermetically sealed. For this type of transformer if it's completely drain do i have to do vacuuming to fill new oil back into the transformer?

Please anyone will similar experience can share.

260KVA Transformer,3Phase,HV=913-3162V LV-400V Type C

ESCO special purpose transformer

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Anonymous Poster #1
#1

Re: Leakage on transformer

05/10/2012 3:44 AM
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Guru

Join Date: May 2010
Location: Liverpool, NY
Posts: 722
Good Answers: 86
#2

Re: Leakage on Transformer

05/10/2012 2:06 PM

You only need to drain enough oil to get below where it is leaking out. If it is the tap changer's external operator leaking, it probably needs bushing packing or replacement. For a transformer this small (260kVA), it is generally unnecessary to vacuum fill unless you are going to leave the core & coils exposed out of oil for an extended period of time (days -weeks). At that voltage, the little moisture that could be absorbed into the winding insulation shouldn't affect its qualities measurably.

The work should be done in dry weather conditions, in a protected area so that water, dirt, dust, or other foreign matter won't get in the transformer. It is good to have some bottles of dry air available to purge the inside of the tank while the work is being done. It keeps out excess moist air, as well as making the inside breathable if someone needs to stick his head in there while working.

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