Can anyone explain why a CT would be subject to flux saturation, but a VT normally wouldn't?
I would think that VTs would not see this d.c.component in its secondary during a line fault.
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Magnetizing working point of voltage transformers is fixed by applied constant primary voltage. This working point doesn't vary even in secondary short circuit fault condition.
However in current transformers, the magnetizing working point varies when the primary/secondary current changes; because the link voltage of this type transformer is variable and may change proportion to multiplying of CT secondary current and secondary impedance. Therefore the voltage level of CT may be increased very much (CT saturation) due to primary short circuit fault currents.
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You're right. It wasn't a very good link.
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