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I_am_learning
#9
Feb14-12, 07:51 AM
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Quote Quote by NascentOxygen View Post
There should be no inrush of current at switch-on. An unloaded transformer is inductive, so current builds up 'slowly'.

It's at switch off that inductive loads have an antisocial tendency. There can be a spark across the switch contacts due to the inductive kick as the magnetic field collapses.
Quite misleading.
Transformers are known for their inrush currents on switching on. In-fact Protection circuits of heavy power transformers have some mechanisms to identify this inrush current from shot circuit current and prevent false tripping.
http://www.opamp-electronics.com/tut...nt_2_09_12.htm
this article describes about inrush current.
Edit: Though, in this case inrush current won't be significant, because, as jim hardy told, we are operating 415V coils at 230 volts.