Wiring a Step Up Transformer

What do you want to know? How to calculate turns ratios or turns per volt ratios or how to size and make an autotransformer Vs a full isolated primary/secondary transformer?

What exactly is troubling you?

Which wire goes where?

Did they forget to furnish the FM?

Not sure what you want....

http://www.allaboutcircuits.com/textbook/alternating-current/chpt-9/step-up-and-step-down-transformers/

Come on Fredski, give us half a chance. The transformer rating and configuration would be a help.

I think Fredski is having us on!

not really. I don't [physically have one so I was looking at drawings. I don't need to know the turn ratio or anything that simple. I didn't understand all the "H's" and X's , which we're joined ( as you do in a dual voltage motor). where exactly do your existing line wires go and what connections to expect the higher voltage to be on what leads?I don't like the idea of wiring anything, energizing it and hoping all the connections are right......stuff has a tendency to create smoke if you mix that up!so I'm looking for a simple explanation on which leads get joined....any jumpers and where to my input leads go as well as what 2 leads have the higher voltage?

How many leads do you have? How about attaching a picture.

"Look at the 2 wires connected on the LV . One to H1 and the other to X2 & X4.

On the HV connect one to H1 and the other to H4, X1 & X3 ... H2 & H3 are only connected to each other.

http://www.justanswer.com/electrical/6f6r6-sq-d-buck-booster-voltage-coming-242v.html

This is an autotransformer or a buck-boost transformer. (An autotransformer is smaller, lighter, and cheaper than an equivalent transformer with isolated coils.

Coils H1-H2 and H3-H4 are energized by the input low voltage. These coils are magnetically coupled to each other and to the other two windings, X1-X2 and X3-X4. The voltage of these windings (X1-X2, X3-X4) is added to the input to give the higher voltage output.

The reason they are connected together this way is that the manufacturer builds a single model that can be configured differently depending on the input voltage and the output voltage/current requirements.

I don't know if this answered you question...

http://www.automationdirect.com/static/specs/buckboosttransformerspecs.pdf

I get it now

It maybe true that comparatively an autotransformer is less bulkier in size than an equivalent isolation type transformer but actual power handling capacity is also dependent on the AWG size of magnet wire plus its number of turns wound per coil.

As shown it can also be used as a step-up or as a stepdown, depending on the application?

I'll bite.

I like playing with re-wiring microwave oven transformers so here goes the basics.

1. Identify which coils is the primary and then decide which lead going into it will be the neutral. Follow that lead's rotation around the core and take note of the direction of rotation.

2. Now look at the secondary. Identify the leads and follow the turns and see if the rotation is in the same direction as the primary.

2a. If it is the same direction as the primary, then the nuetral will be entering the coil from the same direction as the neutral you identified on the primary.

2b. If it is opposite of the primary, then the neutral lead will be entering from the other direction.

The reason to identify the neutral ends, is that they can both be connected to the core and the earth. The other two will be hot.

Transformer windings are wound in the same directions.... It is how their terminal ends get electrically connected that will determine whether the winding coils are in series aiding, series-opposing or will be in parallel !

Each winding coils have a start and finish ends, and how these ends are connected that will determine whether the build up magnetic flux phases will be in-sync or not!

Series-opposing connections is when some magnetic flux will tend to cancel out one another, how much will depend on the ampere-turns of those coils/windings!