HomeMy WebLinkAboutFAULT CURRENT CALCULATIONS - 21-00048 - Barney Dairy Lift Station - ElectricalBret
I was asked to send this over to you for the Barney Dairy lift station project.
From RMP we have a 75 K transformer 480y/277 pad mounted transformer
Looking a RMP 105F worksheet we have 5,575 amp of fault current at the transformer
With the Bussmann info.
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The Gear is 200 amp 600 10 ka
This is a screen shot from the submittal
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This is the screen shot of the Short circuit current with a infinite bus
Short Circuit Transformer Bus Current Assuming an Infinite Bus1
Table 1: 480Y/277 Three Phase Pad Mounted Transformer
Information provided by Manufacturer
Transformer kVA
Stock Number
% IR
%IX
X/R ratio
Transformer %Z
Calculated Fault Current (Amps)
75
4710090
1.01
2.92
2.89
1.62
5,575
112.5
4700091
0.98
2.52
2.57
2.70
5,018
150
4700228
0.89
2.97
3.34
3.18
5,680
225
4700229
0.8
3.74
4.68
3.52
7,698
300
4700094
0.78
3.66
4.69
1.61
22,439
500
7991410
0.74
3.88
5.24
1.94
31,037
750
7991371
0.73
5.68
7.78
5.63
16,042
1000
9174749
0.62
5.74
9.26
5.45
22,096
1500
7992507
0.69
5.65
8.19
5.46
33,083
2000
4700159
0.69
5.62
8.14
5.66
42,553
2500
9175845
0.63
5.65
8.97
5.39
55,855
James Ball,
Office: 208-754-9389 // Cell: 208-860-8424
Shipping: 3896 East 600 North Rigby, Idaho 83442
Mailing: PO Box #142 Menan Idaho, 83434