In alt.engineering.electrical daestrom wrote:
|
| wrote in message
| ...
| In alt.engineering.electrical Don Kelly wrote:
|
| | Yes -you are shorting a part of the winding but the switching is a bit
| more
| | complex than that so that short circuit currents are limited to
| reasonable
| | values. It is a multistep operation with reactor switching. On-load tap
| | changers are expensive and are generally limited to applications where
| this
| | is absolutely needed (I have seen one where the tap changer was nearly
| as
| | large as the transformer).
|
| What about multiple parallel transformers, or at least multiple parallel
| windings on the same core (on whichever side the tapping is to be done),
| where the taps are stepped incrementally on each winding? Instead of a
| shorted winding segment, you'd have windings of differing voltage in
| parallel as each of the windings change their taps one at a time.
|
|
| So when one is set for say 118V and the other is set for 120V, you have a
| 118V source connected in parallel with a 120V source and the only impedance
| is the transformer windings??
|
| OUCH!!! I think the magic smoke will be spewing in no time

I was afraid of that.

That also means if you are going to parallel 2 transformers, they better have
exactly the same winding ratio.

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