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Three phase system - Impedance Query

Three phase system - Impedance Query

Three phase system - Impedance Query

(OP)
Hi

In a three phase system, the positive sequence of a network reduced is based on single phase impedance. Is this correct?

Particularly for a three phase cables, is this correct in saying the positive sequence of the cable is basically single phase positive impedance of the cable? That is saying for a balanced three phase fault, the fault currents will be same across the three phases hence it can be computed by using single phase cable impedance.

How about the zero sequence of the cable, will it be the same as using the zero sequence of single phase cable impedance?

How do you perform a zero sequence tests on a three phase single core cables.
Anyone to share extra info on this?

Thanks!

RE: Three phase system - Impedance Query

Sequence impedances are on a single phase basis (impedance per phase), but this is not the same as saying that the impedance is the same as that of a single phase cable. Manufacturers list the impedance per phase of three phase cables.

What would the three phase impedance of a cable mean anyway?

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