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What are the typical values of characteristic impedences of
overhead line and underground cabel?
Why there is so much variation?
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Answer Posted / 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.
Author:arbelectbit@yahoo.com
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