There are two special considerations that come into play, when you parallel transformers. Yes it can be done; it also can be dangerous.
One issue is that you are not only placing two voltage sources in parallel (and this is why you can get more current). You are also placing in parallel the two impedances internal to the two transformers. Look at the model of a transformer: a voltage source in series with an impedance. Put two of the impedances in parallel, and the net impedance goes down by half. In the event of a downstream fault (e.g., a short circuit on the load side of the parallel transformers), the amount of current they can feed into the fault will double. Therefore, you would have to make sure that the downstream components are rated to handle the higher value of fault current.
The other issue is that in the event of a fault internal to one transformer, the other transformer will feed current into the fault point. If you have connected the two secondary sides directly to each other, then there is nothing to stop that fault current from flowing forever (or until something burns down). Therefore, when two or more transformers are connected in parallel (a configuration known as a ?spot network?), we have to provide what is called a ?network protector.? This consists of a circuit breaker immediately downstream of each transformer (before the point at which they are connected together), and an electronics package that will sense current flowing ?backwards? (i.e., into a transformer, instead of out from it), and cause the breaker to trip (to terminate the event).
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