Page 686 - V16 Catalogue Final

TRANSFORMER RATINGS

GUIDE TO LOW VOLTAGE FAULT LEVEL

kVA mVA Current (I) Current (I) Typical Z1 @ 433V PSC @ 433V
kVA/1000 @ 11kV @ 433V % Z in Ohms in kA
15 0.015 0.79 20 4.75 0.5937 0.421
25 0.025 1.31 33.33 4.5 0.3375 0.741
50 0.050 2.62 66.67 4.5 0.1687 1.482
100 0.100 5.25 133.34 4.75 0.0891 2.807
150 0.150 7.87 200.01 4.75 0.0594 4.211
200 0.200 10.5 266.67 4.75 0.0445 5.614
300 0.300 15.75 400.01 4.75 0.0297 8.421
315 0.315 16.53 420.01 5 0.0298 8.400
400 0.400 20.99 533.35 4.75 0.0223 11.228
500 0.500 26.24 666.69 4.75 0.0178 14.035
600 0.600 26.24 666.69 4.75 0.0148 16.843
750 0.750 39.36 1000.03 4.75 0.0119 21.053
750 0.750 39.36 1000.03 6.25 0.0156 16.000
800 0.800 41.99 1066.70 4.75 0.0111 22.457
1000 1.000 52.49 1333.37 4.75 0.0089 28.071
1200 1.200 62.98 1600.05 5 0.0078 32.001
1350 1.350 70.86 1800.05 5.25 0.0073 34.287
1500 1.500 78.73 2000.06 5.5 0.0069 36.365
2000 2.000 104.97 2666.74 5.5 0.0052 48.486
2500 2.500 131.22 3333.43 6 0.0045 55.557
- The attached calculations are based on zero source impendance and are intended as a guide only.
Example: Fault level for 400kA Sub:

Ohms = KV Line Voltage x %Z = (433) 2 x (4.75) = 0.02226 Ω
2
MVA 0.4x10 6 100

KA = KV Line Voltage = 433 = 11.228 KA
√3 x Ohms √3 x 0.02226

678 V16-TR-R03 www.ipd.com.au Phone: 1300 556 601