Single Phase Transformer Weight Limitation.

But this is normally against the design principles. i.e. we do not increase the no. of units just to overcome transport limitation problem.

Actually you do need to consider this at the design stage, as you do with height restrictions for road transport and weight and size restrictions for air transport.

Can the single phase transformer be taken to the site in pieces and assembled instead of transporting them in a single piece with nitrogen gas filled?

Short answer, no. Transformer assembly in the field is difficult but it may be possible (under some circumstances), however it would take a lot of extra time and expertise to assemble and test in the field and so I cannot see it being economical (or even acceptable for the end client) compared to using an additional transformer.

Removing the oil won't get the transport weight down much either.

Is there any explanation of why there is a weight limit? Maybe the transport method could be changed?

With regards to this, the weight limit is because of weight limitation imposed by access road.

Regards,

sks

You didn't mention the 3phase rating of the transformer. You can order 3nos single phase units each of 1/3rd the 3phase rating,test at manufacturer's work and connect the primary as well as secondary windings in either star or delta as required by you with the advice of manufacturer. If you want to reduce the weight further,remove oil and fill with nitrogen, in which case you should filter the oil after filling at site.

As expected, but is the limit a bridge, the whole road or just a limited part? Or is it the customer's assessment of what his vehicle can carry? If a bridge, are we talking total weight or axle weight limit? Is it a public road [in which case state orgaiization will tell you reason for limit] or private? Who is responsible for transport? Do you know how much you will be overweight with two transformers without oil? Stir up the Sales Dept to help - if they took the job without checking effect of weight limit with engineering, they ought to help!