Name: John M.
I have a transformer that does not tell what type it is
all it has is a long line with three short dashes under it.Can you tell
me if it is AC or DC by this symbol.Thank you.
I am not an engineer, but I have been around a lot of transformers. I am not
aware of a DC transformer. The changing flux of AC in the primary is
required to induce a current in the secondary.
The closest thing to a DC transformer is a saturated core reactor. It uses a
DC current to increase the density of the magnetic flux in the core thereby
decreasing the loses to the AC signal impressed over the DC signal. A rather
unusual situation and likely not yours.
I do not know your symbol, but it might be the electrical symbol for a
transformer with a portion missing.
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Update: June 2012