Parallel Transformers

Yes you can. Need a synchrony transformer device. It is simple compare to synchrony generators.

Yes it is possible. However, be aware that the fault current at LV side will increase. You may have to reconfigure the protection system.

If you're transformers have OLTC's then you'll need a synchronizer to synchronize the changing of taps. Same OLTC's doesn't mean they will behave the same way when their txfrs are paralleled. Each OLTC will always behave differently even if the two are of the same brand, type, rating, etc. That's just the way they are.

are you brother with JRAEF? because i see your avatar picture is same

Please be aware that failure of one protection device on single transformer will result in overload of other transformer, so protection devices must be slaved to each other.

Also, just because impedance is 6.5% on nameplate, it doesn't necessarily mean that the number is exact, and if they are indeed not identical transformers one will be a slight load on the other. Temperature monitoring and incorporation into protection circuits is recommended.

A paper mill I am working at is currently installing 2x 20 KVa transformers in parallel. Each will be at half load, so loss of one will not affect the mills capacity. This is due to lead in times of order a replacement.

But you have independent switchgears. In the first case mention here , he is electrically paralleling using single swichgear on primary and secondary sides.

If your company has the funds, it might be better to parallel the two 2000 KVA xfmrs in a redundant format rather than replace them with a new single xfmr. This would give you the ability to take down a certain amount of equipment and maintain or repair it without taking down your entire facility. The question would be the cost of new equipment over the cost of a new large xfmr and how far you want to take the redundancy.