billyfri
Jun 18, 2011, 02:38 PM
What is an autotransformer
tkrussell
Jun 19, 2011, 03:12 AM
How does the NEC relate to autotransformer?
From Merriam-Webster dictionary:
Definition of AUTOTRANSFORMER
: a transformer in which the primary and secondary coils have part or all of their turns in common
These have specific purposes, why do you ask?
Chris.w197
Jun 19, 2011, 08:46 AM
An auto transformer is a transformer that only has one coil. It still has a normal input and output and works just like a normal transformer. It is cheaper and lighter but has the drawback that under fault conditio0ns the supply voltage can appeare at the output. EG a 110v:12v autotransformer could give an output of 110v if a short occurs! They are normally used where a slight change in voltage might be needed say to boost voltage at the end of a long line when higher load is present! This url might help!
http://www.allaboutcircuits.com/vol_2/chpt_9/5.html