hey all , i have 2 phase welding machine fed from 30A 3 phase circuit breaker , at high loads above 40A CB cut off the Supply . the problem is i cant change the CB size bcoz it Contrary to legislation in the country . Can i used scott t transformer to balance the load at the main 3 phase ?
When you say you have a 2 phase welding machine, that is not enough information to answer your question with a reasonable margin for success. If your welder is indeed a two phase machine, where the phase angle relationship between phases is 90 degrees and not 120 degrees, and you have a three phase service whose phase relationship is 120 degrees between phases, it is possible to build a Scott T transformer bank that will give you a 2phase 4 wire system. You will need two transformers. One of the transformers will need a center tap on its primary winding brought out and the other transformer will have to have a tap at 86.6% of full winding voltage brought out of its primary windings. Also you will only be able to get about 58% of the nameplate capacity from the transformers for the same reasons you get 58% from an open delta transformer connection for three phase. These will be special made transformers, unless you are winding them yourself, and will be expensive. I suspect they and the special connections you will have to make, will exceed the cost of a new 3 phase welder. Last but not least, if indeed your welder draws 40 amps per phase using a three phase circuit you presently have, other alternatives present themselves. Such as a larger three phase service to allow for the 40 amp load. Also you might consider at least one transformer with a center tap primary and the second one without the 86.6% tap. The secondary will be slightly out of balance due to the higher voltage on one set of secondary (about 14% higher) but it may work for the welder. Hope this helps, Newton1Law
you're starting to be to be meant a single section welding device. This unit includes 2 supply lines. those lines may be linked to any 2 lines of a three-phse ability supply device.only connect one line to L1 and the different line to L2, only examine the line to line voltage of the flexibility supply. It must be the comparable by way of fact the welding device score, say, 380VOLTS, 50 Hz.
