Can a electrical transformer have more the 1 input, while only having 1 output so that the power is combined into the 1 output,or would multiple inputs make the power feed back onto the other inputs and overload them.
Rocky has the correct answers. Edit - since more contradictions have come in. Number 5 is definitely FALSE. The power out of a transformer is effectively the same as the power into it. If the 2ndary voltage is lower than the primary then the secondary current must be larger than the primary current ( since power voltage x current ) Check out old school power supplies - fused at 3 amp on the primary side ( input ) and 8 or amps on the output side.
Yes they can. There are two and three phase input transformers in common use that do this all the time. What is important though, is that the power sources for each phase are properly synchronized. Essentially this type of transformer Has three input windings and singl eoutput winding, that provides a single phase output that takes its power form the other two or three phases. Again, having the right phasing is critical when hooking up a transformer like this.
I think what you're talking about is a 3 winding (or higher) transformer. A 3 winding transformer is just like a regular 2 winding transformer except you have another set of windings on a common core. With this you can provide step down from say 13.8 and provide secondary voltages at 480 and 2400V. Utilities sometimes use them as well when connecting different systems that have slightly different voltage ratings. Just so long as the transformer is protected properly and the transformer is loaded within its ratings there will be no problems. The company I work for has a portable transformer used to provide temporary loads when we do substation replacements or for emergencies. It has a 13.8kV primary and 4160/2400V and 480V secondary. One real consideration with a 3 winding transformer is the extra fault current that is available. There will be contributions from all 3 windings.
Not an easy thing to do and definitely not for a beginner to attempt. Your wording of the questions shows you do not have the background knowledge to try it. Some transformers may be hooked so they have different input voltage ratings but what you are trying to do I'm not sure.
