basicbill
Member
- Location
- Western Canada
Here's a situation that I would like to share. A 240volt to 208volt, single phase auto-transformer.....properly protected by a circuit breaker. I would like to be able to calculate the fault current for it. In my mind, since there is no electrical isolation, I must consider the upstream, two coil transformer to make this calculation.
I think of it this way....if I have a line to line fault on the secondary of the auto-transformer, that effectively shorts out the common coil portion of the auto-transformer....leaving only a small number of windings (what's left) in series with the fault - now being fed by the upstream transformer.
Is my thinking straight on this?
I think of it this way....if I have a line to line fault on the secondary of the auto-transformer, that effectively shorts out the common coil portion of the auto-transformer....leaving only a small number of windings (what's left) in series with the fault - now being fed by the upstream transformer.
Is my thinking straight on this?