(27) size of transformer's circuit braker & fuse (10.6.13)
DESCRIPTION
transfomer sizingTRANSCRIPT
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5/24/2018 (27) Size of Transformer's Circuit Braker & Fuse (10.6.13)
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Enter Data in White Background Cells
Calculation Size of Circuit Breaker & Fuse are as per NEC 450.3
Sr.No Equipment Kw P.F Qty Equipment D.F Total Kva D.F (Kva)
3 1 1 100% 3 30 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 00 0
0 0
0 0
0 0
3
100%
3
Calculate Size of Transformer / Fuse / Circuit Breaker
Total D.F (Kva)
Total Load (Kva)
Total Load D.F
CONNECTED EQUIPMENT TO TRANSFORMER
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Total D.F Load 3 Kva
Primary Side Voltage (L-L): 415 VoltSecondary Side Voltage (L-L): 230 Volt
Transformer Impedance: 5%
Transformer Connection Y-Y
Size of Transformer: 3 Kva OR Kva 3
Efficency of Transformer at Full Load 98.40% 0.984
Efficency of Transformer at 1/4 Load 97.50% 0.975
Location of Transformer
Provide Protection on Transformer:
Type Protection on Primary & Secondary Side:
Primary Line Voltage (L-L) 415 Volt
Primary Phase Voltage (L-P) 240 Volt
Primary Line Current(L-L): 4 Amp
Primary Phase Current(L-P): 4 Amp
Secondary Line Voltage (L-L) 230 Volt
Secondary Phase Voltage (L-P) 133 Volt
Secondary Phase Current(L-P): 7.5 Amp
Secondary Line Current(L-L): 7.5 Amp
Size of Circuit Breaker on Primary Side: 10 Amp
Size of Fuse on Primary Side: 10 Amp
Size of Circuit Breaker on Secondary Side: 10 AmpSize of Fuse on Secondary Side: 10 Amp
Total Losses@ Full Load 49 Watt
Total Losses@ 1/4 Load 19 Watt
Full Load Copper Loss 32 Watt
Core Loss 17 Watt
Pri.Side & Sec.Side
Size of Circuit Breaker / Fuse (As per NEC 450.3)
Transformer Losses
Transformer Voltage / Current
:Results:
Transformer Details
Jignesh.Parmar www.electricalnotes.wordpress.com,
Enter Detail ofTC/CB/Fuse
Supervised Not Supervised
Circuit Breaker Fuse
http://www.electricalnotes.wordpress.com/http://www.electricalnotes.wordpress.com/http://www.electricalnotes.wordpress.com/http://www.electricalnotes.wordpress.com/ -
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Standard Size of 3 Phase
Transformer (KVA)
Standard Size of Fuse / C.B
(Amp)1 1
3 36 6
9 10
15 15
25 20
30 25
37.5 30
45 35
50 40
75 45
112.5 50
150 60
225 70300 80
500 90
750 100
1000 110
1500 125
2000 150
2500 160
3750 175
5000 200
7500 225
10000 250
12000 300
15000 350
20000 400
25000 450
30000 500
37500 600
50000 700
60000 800
75000 1000
100000 1200
1600
2000
2500
30004000
5000
6000
Size of Transformer / Fuse / Circuit Breaker
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1 1 1 1
3 6 3 36 10 6 6
10 15 10 10
15 20 15 15
20 25 20 20
25 30 25 25
30 35 30 30
35 40 35 35
40 45 40 40
45 50 45 45
50 60 50 50
60 70 60 60
70 80 70 7080 90 80 80
90 100 90 90
100 110 100 100
110 125 110 110
125 150 125 125
150 160 150 150
160 175 160 160
175 200 175 175
200 225 200 200
225 250 225 225
250 300 250 250
300 350 300 300
350 400 350 350
400 450 400 400
450 500 450 450
500 600 500 500
600 700 600 600
700 800 700 700
800 1000 800 800
1000 1200 1000 1000
1200 1600 1200 1200
1600 2000 1600 1600
2000 2500 2000 2000
2500 3000 2500 2500
3000 4000 3000 30004000 5000 4000 4000
5000 6000 5000 5000
6000 6000 6000 6000
SupervisedUnSupervised
Fuse / Inverse Time C.B as per NEC (Amp) Fuse / Inverse Time C.B as per NEC (Amp)
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2
3 3
2 3 6
1
1 1 3 C.B Fuse
3 3 6 1 600% 300%6 6 9 2 600% 300%
9 9 15 600% 300%
15 15 25 25 13
25 25 30 25 10
30 30 37.5
37.5 37.5 45
45 45 50
50 50 75
75 75 112.5
112.5 112.5 150
150 150 225 C.B
225 225 300300 300 500 1% 600%
500 500 750 2% 600%
750 750 1000 3% 600%
1000 1000 1500 4% 600%
1500 1500 2000 5% 600%
2000 2000 2500 6% 600%
2500 2500 3750 7% 400%
3750 3750 5000 8% 400%
5000 5000 7500 9% 400%
7500 7500 10000 10% 400%
10000 10000 12000
12000 12000 1500015000 15000 20000
20000 20000 25000 Prim. 5% 0
25000 25000 30000 Sec. 0
30000 30000 37500
37500 37500 50000
50000 50000 60000
60000 60000 75000
75000 75000 100000 Prim. 5% 0
100000 100000 100000 Sec. 0
Primary
>6
Pri
%Imp
More Than
3 Phase T.C (KVA)
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C.B
1% 600%
2% 600%
3% 600%
4% 600%
5% 600%
6% 600%
7% 400%
8% 400%
9% 400%
10% 400%
Protection
Method More than
9A
Primary only
protection
125%(NH)
Primary and
secondary protection
250%
Primary Only
Amp Pri
1 300%
2 167%
3 167%
4 167%
5 167%
6 167%
7 167%
8 167%
9 167%
10 125%
4.17 167%
7.53 6.97
6
Primary & Secondary pro
Maximum Rating of Over curren
Pri
Primary only protecti
%ImpPri
>6
More Than
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Amp Pri
1 250%
2 250%
3 250%
4 250%
5 250%
6 250%
7 250%
8 250%
9 250%
10 250%
4.17 250%
7.53 10.43
10
10
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0
C.B Fuse
250% 250%125% 125%
250% 250%
19 19 C.B Fuse C.B Fuse
15 15 10 10 10 10
600
ary secondary
00V Supervised
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600
00V Not Supervised
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5/24/2018 (27) Size of Transformer's Circuit Braker & Fuse (10.6.13)
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Sec
167%
167%
167%
167%
167%
167%
167%
167%
125%
125%
167% 0
12.58
10
10