TECHNICAL |
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Main Fuse and Supply Cable Cross Section for Three Phase Capacitors |
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Rating |
Rated Voltage 400 VAC |
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Rated Voltage 525 VAC |
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Kvar |
Rated |
Fuse rating |
Supply cable |
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Rated |
Fuse rating |
Supply cable |
Current |
Delay type |
Cross section |
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Current |
Delay type |
Cross section |
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AMPS |
AMPS |
mm² |
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AMPS |
AMPS |
mm² |
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2 |
2.88 |
10 |
1.5 |
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2.5 |
3.60 |
10 |
1.5 |
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2.74 |
10 |
1.5 |
3 |
4.32 |
10 |
1.5 |
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3.30 |
10 |
1.5 |
4 |
5.76 |
10 |
1.5 |
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4.40 |
10 |
1.5 |
5 |
7.20 |
16 |
2.5 |
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5.50 |
10 |
1.5 |
6 |
8.64 |
16 |
2.5 |
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6.60 |
16 |
2.5 |
7.5 |
10.80 |
20 |
2.5 |
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8.30 |
16 |
2.5 |
10 |
14.40 |
25 |
4 |
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11.00 |
20 |
2.5 |
12.5 |
18.00 |
36 |
6 |
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13.70 |
25 |
4 |
15 |
21.60 |
50 |
10 |
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16.50 |
36 |
6 |
16.7 |
24.10 |
50 |
10 |
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18.40 |
36 |
6 |
20 |
28.80 |
50 |
10 |
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22.00 |
50 |
10 |
25 |
36.00 |
63 |
16 |
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27.40 |
50 |
10 |
30 |
43.20 |
80 |
25 |
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33.00 |
63 |
16 |
35 |
50.50 |
100 |
35 |
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38.50 |
80 |
25 |
40 |
57.60 |
100 |
35 |
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44.00 |
80 |
25 |
50 |
72.00 |
125 |
50 |
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55.00 |
100 |
35 |
60 |
86.40 |
160 |
50 |
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66.00 |
125 |
50 |
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Current Rating for Single Rectangular Copper Busbar in Still Air |
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Main Fuse and Supply Cable Cross Section for Control Sytem 400 VAC. |
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Busbar |
Mass |
Approximate |
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size |
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A.C. |
Bank |
Supply Cable |
Fuse rating |
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rating |
Cross Section |
Delay type |
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mm x mm |
Kg / m |
Still air Amp |
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25 x 3.15 |
0.703 |
300 |
Kvar |
mm² |
Amps |
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25 x 6,3 |
1,406 |
400 |
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31,5 x 6,3 |
1,772 |
500 |
10 |
4 x 4 |
25 |
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31,5 x 10 |
2,812 |
600 |
12.5 |
4 x 6 |
36 |
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40 x 6,3 |
1,406 |
600 |
15-20 |
4 x 10 |
50 |
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40 x 10 |
3,572 |
800 |
25-30 |
4 x 16 |
63 |
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40 x 12.5 |
4,465 |
900 |
35-40 |
3 x 25 + 16 earth / wire |
80 |
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50 x 6,3 |
2,902 |
800 |
50 |
3 x 35 + 16 earth / wire |
100 |
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50 x 10 |
4,456 |
1000 |
60 |
3 x 50 + 25 earth / wire |
125 |
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50 x 12,5 |
5,581 |
1100 |
75 |
3 x 70 + 35 earth / wire |
160 |
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80 x 6.3 |
4,500 |
1100 |
90-100 |
3 x 95 + 50 earth / wire |
200 |
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80 x 10 |
7,144 |
1400 |
120-125 |
3 x 120 + 70 earth / wire |
250 |
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80 x 12,5 |
8,93 |
1600 |
150 |
3 x 185 + 95 earth / wire |
315 |
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80 x 15,8 |
11.288 |
1800 |
175-200 |
Two Cables 3 x 95 + 95 earth / wire |
400 |
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100 x 6,3 |
5,626 |
1400 |
210-250 |
Two Cables 3 x 120 + 95 earth / wire |
500 |
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100 x 10 |
8,930 |
1600 |
270-300 |
Two Cables 3 x 185 + 95 earth / wire |
630 |
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100 x 12,5 |
11,163 |
2000 |
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101 x 15,8 |
14,250 |
2500 |
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FINDING THE REQUIRED CAPACITOR RATINGFor Individual Correction of Motors |
USEFUL 3 PHASE FORMULAE |
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The Capacitor Rating should correspond approximately to the apparent power of the motor on No- Load . |
KW= |
KVA x Power Factor |
The rating given in the table below are for guidance purposes and based on 1500 r.p.m. motors. The tabulated values can be increased by 5 % for 1000 r.p.m. motors and by 15 % for 750 r.p.m. motors. |
KW= |
Line Amps x Line Volts x 1.73 x Power Factor |
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1000 |
Motor Rating KW |
Motor Rating H.P. |
Capacitor Rating KVAr |
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KW= |
HP x 746 |
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1000 x Efficiency |
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KVA= |
KW |
1 to 1.9 |
1.0 to 2.6 |
0.5 |
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Power Factor |
2 to 2.9 |
2.7 to 4.0 |
1 |
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3 to 3.9 |
4.1 to 5.3 |
1.5 |
KVA= |
Line Amps x Line Volts x 1.73 |
4 to 4.9 |
5.4 to 6.7 |
2 |
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1000 |
5 to 5.9 |
6.8 to 8.0 |
2.5 |
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6 to 7.9 |
8.1 to 10.7 |
3 |
KVA= |
HP x 746 |
8 to 10.9 |
10.8 to 14.8 |
4 |
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1000 x Efficiency x Power Factor |
11 to 13.9 |
14.9 to 18.9 |
5 |
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14 to 17.9 |
19.0 to 24.4 |
6 |
Line Amps = |
KW x 1000 |
18 to 21.9 |
24.5 to 29.8 |
7.5 |
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Line Volts x 1.73 x Power Factor |
22 to 29.9 |
29.9 to 40.9 |
10 |
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30 to 39.9 |
41.0 to 54.0 |
Approx. 40 % of motor |
Line Amps = |
KVA x 1000 |
From 40… |
From 54.1 … |
Approx. 35 % of motor |
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Line Volts x 1.73 |
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Line Amps = |
KVA x 1000 |
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Line Volts x 1.73 x Power Factor x Efficiency |
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Capacitor Rating Required for individual Correction of Transformers |
FORMULAE TO CALCULATE MASS (Kg)FOR RECTANGULAR COPPER BUSBAR WIDTH x THICKNESS x 0.00893=KG |
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The capacitor is intended only to cover the no-load reactive VA of the transformer. The capacitor rating is roughly 3 % to 5 % of the transformer rating . In case of doubt please consult your supply undertaking. |
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Transformer Rating KVA |
Capacitor Rating for Voltages of |
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COPPER BUSBAR TORQUESETTINGS FOR MCC`s or MDB`sCOPPER CONNECTION TORQUE SETTINGS |
11 KV |
22 KV |
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KVAr |
KVAr |
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250 |
10 |
15 |
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Bolt |
Torque |
400 |
15 |
20 |
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Size |
Nm |
630 |
20 |
30 |
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800 |
25 |
40 |
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M6 |
11 |
1000 |
30 |
50 |
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M8 |
25 |
1250 |
35 |
60 |
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M10 |
35 |
1600 |
50 |
80 |
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M12 |
45 |
2000 |
60 |
100 |
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M16 |
91 |
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