Calculation of line inductance

[thinker]

Working with power quality/harmonics control standard
IEEE 519-92 I found that Paragraph 8.5.3 states:" Typically,
the per-phase line inductance on a three-phase AC line can
be considered to be 0.3 microHenry per foot of line". When
using this for line impedance and short circuit calculation,
the above number seems to be way too high. It is not clear
how that number could be derived without referencing to the
type of the feeder. Is this really a magic number? Could anybody advise another source for estimation of line (cable) impedance?

 

[jlazucena]

In 8.5.2 states 600V and bellow
As a reference you can use "Element of Power System Analysis" by Stevenson

 

[jghrist]

Resistance and reactance for 600V cables can be found in NEC-2000 Table 9. The value in IEEE-519 is conservatively high for calculations of voltage notching, but for fault current calculations, a high estimate is not conservative.