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What are the typical values of characteristic impedences of
overhead line and underground cabel?
Why there is so much variation?

What are the typical values of characteristic impedences of overhead line and underground cabel? ..

Answer / iamdon

Characteristic impedence of overhead line=400 ohm
Characteristic impedence of underground cable=40 ohm

Characteristic impedence= Square root of (L/C).

In case of overhead lines L dominates so higher
Characteristic impedence.
In case of underground cables C dominates(conductors are
very close to each other) so lower Characteristic impedence.

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