When the secondary winding of a CT is opened when there is power applied to the primary, this will cause the transformer to produce a step-down in voltage that could still be high enough to kill anyone who comes in contact with it.

Question

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When the secondary winding of a Current Transformer (CT) is opened while there is power applied to the primary, it does not produce a step-down in voltage. Instead, it can lead to dangerously high voltage across the open secondary due to the transformer trying to maintain its magnetizing current, potentially causing insulation breakdown or harm to anyone coming into contact with the open secondary terminals.

When the Secondary Winding of a CT Is Opened When