Choose the INCORRECT statement with respect to DC transmission systems.

1
It has less corona loss and reduced interference with communication circuits.
2
The potential stress on the insulation is less in case of a DC system than that in case of an AC system, for the same working voltage.
3
Electric power can be generated at a high DC voltage -for a DC transmission system.
4
There is no skin effect in the transmission line in a DC transmission system.

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