Ventilated Dry type transformer inside a building

[CuriousElectron]

Hello,
Are large dry-type transformers installed inside industrial facilities typically of a ventilated design(versus non-ventilated which would typically be installed outdoors)? Also, do these units require proper clearance for air flow, especially if they come with AA/FA rating? Would one expect ventilated type units to have higher noise profile versus non-ventilated or sealed type transformer enclosure?
Thanks,
EE

 

[RRaghunath]

Hello,
Are large dry-type transformers installed inside industrial facilities typically of a ventilated design(versus non-ventilated which would typically be installed outdoors)? Also, do these units require proper clearance for air flow, especially if they come with AA/FA rating? Would one expect ventilated type units to have higher noise profile versus non-ventilated or sealed type transformer enclosure?
Thanks,
EE

Yes, if the location in the industrial area is not too dusty. Ventilated design is always preferred as it reduces the size of transformer and hence the cost.
Ventilated type is more noisy unlike the sealed ones.

 

[dpc]

In my experience, non-ventilated dry type transformer are limited to small sizes, generally 30 kVA or less. Cast-coil transformers are available in larger sizes. They are all noisy.