588 HANDBOOK OF ELECTRICAL ENGINEERING
Table H.1b. Properties of the fault current for different X-to-R
ratios
X-to-R
ratio
(pu)R-to-X
ratio
(pu)Doubling
factor
(pu)Peak
factor
(pu)Power
factor
(pu)
0.1 10.0000 1.0000 1.4142 0.9950
0.2 5.0000 1.0000 1.4142 0.9806
0.3 3.3333 1.0000 1.4143 0.9578
0.4 2.5000 1.0004 1.4148 0.9285
0.5 2.0000 1.0019 1.4169 0.8944
0.6 1.6667 1.0053 1.4217 0.8575
0.7 1.4286 1.0112 1.4301 0.8192
0.8 1.2500 1.0197 1.4421 0.7809
0.9 1.1111 1.0305 1.4573 0.7433
1.0 1.0000 1.0432 1.4753 0.7071
1.1 0.9091 1.0575 1.4955 0.6727
1.2 0.8333 1.0729 1.5174 0.6402
1.3 0.7692 1.0892 1.5404 0.6097
1.4 0.7143 1.1060 1.5642 0.5812
1.5 0.6667 1.1231 1.5884 0.5547
1.6 0.6250 1.1404 1.6127 0.5300
1.7 0.5882 1.1576 1.6370 0.5070
1.8 0.5556 1.1746 1.6611 0.4856
1.9 0.5263 1.1914 1.6859 0.4657
2.0 0.5000 1.2079 1.7082 0.4472
3.0 0.3333 1.3509 1.9105 0.3162
4.0 0.2500 1.4559 2.0590 0.2425
5.0 0.2000 1.5335 2.1687 0.1961
6.0 0.1667 1.5924 2.2520 0.1644
7.0 0.1429 1.6384 2.3170 0.1414
8.0 0.1250 1.6752 2.3691 0.1240
9.0 0.1111 1.7053 2.4117 0.1104
10.0 0.1000 1.7304 2.4472 0.0995
15.0 0.0667 1.8110 2.5612 0.0665
20.0 0.0500 1.8546 2.6229 0.0499
25.0 0.0400 1.8819 2.6614 0.0400
30.0 0.0333 1.9006 2.6878 0.0333
35.0 0.0286 1.9142 2.7070 0.0286
40.0 0.0250 1.9245 2.7216 0.0250
45.0 0.0222 1.9326 2.7331 0.0222
50.0 0.0200 1.9391 2.7423 0.0200
100.0 0.0100 1.9691 2.7847 0.0100
200.0 0.0050 1.9844 2.8064 0.0050
300.0 0.0033 1.9896 2.8137 0.0033
400.0 0.0025 1.9922 2.8174 0.0025
500.0 0.0020 1.9937 2.8196 0.0020