![]() ![]() To prevent it, they use closely wound coils. Most power transformers do not want voltage drop, so bypassing is unwanted. That is called the short circuit limit current. The current produced in the secondary is the current required to make the field bypass the secondary. If you short the secondary, then all of the induced field will bypass the secondary. That will cause the secondary voltage to drop. When you apply enough load on the secondary, it becomes so hard for the magnetic field to get through the secondary coil that it starts becoming easier to jump around it. But it doesn’t because jumping across the open air is a lot harder than following the steel core. When you have the primary on one side of the core and the secondary on the other side, there is a space between them where the magnetic field can jump across the space and bypass the secondary. The metal core of a transformer is an example of an ideal path. Normally a magnetic line of force wants to take the easiest path available. ![]() ![]() ![]() People often call them “moving core transformers” even though they are really “moving shunt transformers”. I think he is talking about the adjustable shut transformers that are used in welders with a crank on the front. I don’t think he is talking about the type of transformer you posted links to. ![]()
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