Re: Two Phase Input Three Phase Output Transformers
08/30/2010 12:00 PM
Be very careful! Semantics will getcha...
A Scott-tee transformer is ONLY for what we in North America call "2-phase" but is NOT what you would use in other parts of the world where the term "2-phase" is referring to 2-out-of-3-phases in a 3 phase distribution system. True 2-phase power is something exceedingly rare but it does exist in some older pockets of service in North America, such as Philadelphia and Niagara Falls. I can almost guarantee that you do not have 11kV true 2-phase power, at best you have only 2 phases brought out from a 3 phase distribution system. There are very standard basic transformer configurations that can accomplish the voltage transformation, but a Scott-tee is not intended for that.
The problem for you is, you need to identify EXACTLY what you want on the output side and how it is going to be used. The easiest configuration is an Open Delta, but it is going to be Delta, not Star.
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Re: Two Phase Input Three Phase Output Transformers
08/30/2010 12:50 PM
2 phases used to be used quite often in the UK Mines and Quarries. The main reason being the 11KV would be stepped down to 550V for plant use. To use anything in the offices 230V would be from a centre-tapped transformer. Great fun when the supposed neutral is live at 115V. At the time I started my apprenticeship 440V was being introduced on to the plants, this lead to even more fun. A plant could have both 550V and 440V feeds. Some offices on these older plants could have 230V Ph & N and 230V Ph to PH centre tapped at the same time. I got caught out a few times.
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Two Phase Input Three Phase Output Transformers
Re: Two Phase Input Three Phase Output Transformers
