MIL-HDBK-1004/5
Table A-6
Per-Unit Impedance Values Versus Feeder-Cable Lengths (1)
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Feeder Cable
Feeder Cable
4,160-Volt Cable
2,400-Volt Cable
Length
Impedance
Per-Unit Value at Per-Unit Value at
Feet
Ohms
312 kVA, 118 Volt 312 kVA, 118 Volt
1.n-
1.n-
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1,000
0.198 + j0.197
0.00357 + j0.00355
0.0107 + j0.0107
5,000
0.99 + j0.985
0.0178 + j0.0177
0.0536 + j0.0534
10,000
1.980 + j1.907
0.0357 + j0.0355
0.107 + j0.107
20,000
3.96 + j3.94
0.0714 + j0.0710
0.214 + j0.213
30,000
5.94 + j5.91
0.107
+ j0.106
0.322 + j0.32
40,000
7.92 + j7.88
0.143
+ j0.142
0.429 + j0.427
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(1) No. 2-AWG, three-conductor cable has an impedance of 0.198 + j0.197 ohms
per 1,000 feet
74
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