Re: Advice on mains current sensing, safely
Probably just me, but I'm confused by your reference to a primary and secondary winding on a current transformer.
In all the current transformers I have used, there has only been one winding, the "primary" being the active line of the mains cable passed through a hole in the transformer assembly.
Therefore, the "primary" is the mains lead and not likely to be doing anything weird in the event of a short circuit (assuming everything is properly rated and fused of course).
As mentioned above, a suitable burden resistor must be applied to the current transformers windings to prevent it generating large voltages in overload situations.
Using a normal transformer "in reverse" for this type of application is not recommended, not only for the dangers it presents but it also has house insurance implications.
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