Role of a Core in Auto-Transformer 5

[inpran]

Hi all.

I have a few fundamental questions on Auto-Transformers .

1. Apart from the mechanical support, what exactly is the role played by the Core in an Auto-Transformer? In case of a 2 or a 3 winding transformer, the core provides the magnetic path which is not required in case of a Auto-Transformer as the HV and LV are not electrically isolated.

2. Should one consider the leakage reactance in case of a Auto-Transformer's the equivalent circuit?

 

[Skogsgurra]

I answered Compositepro: "My observation has been that the temperature of a variac rises with load just like a normal transformer, even at the 100% setting. Is it just wiper resistance that causes this heating? It doesn't seem like it (uniform heat rather than a hot spot)"



Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[waross]

Hi Gunnar. I am in agreement with you. No load losses, "not much".
A little heat from the wiper. "Not much", and probably much less than the no load losses.

Bill
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"Why not the best?"
Jimmy Carter