Dry vs oil cooled transformers 2

[Keitu]

Has anyone undertaken study onto the Oil cooled transformers versus the dry type used on the underground mines. If so could you be so kind and share your finding with us.
We are a small mine, we have at the moment Oil cooled transformers, we are looking at an option of going dry

 

[slavag]

Hi Keitu.
Why you would like use dry trafo?
I try understand what is advantages of dry transformer?
Regards.
Slava

 

[itsmoked]

Fire perhaps? Oil cooled transformers burn much more than dry types.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[Hoxton]

In UK coal mines, transformers were dry type, with wheels, so they could run on the underground railways (not while they were energised, in case someone asks....)

See the link.

http://www.fki-et.com/main.cfm?FuseAction=History&company=btl

In coal mines, the issue would be safety - and nowadays, the concern about pollution if a transformer leaked oil underground.

So the issue is safety and / or pollution.

What sort of mine do you have? What do you mine? What are your local regulations?

 

[slavag]

Hi.
Keith and Hexton: Thanks a lot, I don't thinking about safety and pollution. Hexton, as I understood it's special flameproof dry type mining xfr.
Regards.
Slava

 

[Keitu]

we are a underground mine producing Chrome Ore. I would agree the measure problem with the Oil cooled Transformers is that they pose a fire harzard and there is a lot involved in their maintenance. I would like to take the comparison further that these point.

 

[pajce]

Also dry type Tx can withstand higher overloads then oil imersed Tx. It is also less maintenance on dry type, no need for oil sampling, just need to vacuum-clean/blow the dust off of the dry Tx. Insulation class as I said is much higher for dry Tx.

 

[DaveScott]

Does anyone have any comments about reliability?