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Copper bar (copper bus) ampacity

Copper bar (copper bus) ampacity

Skin effect

      The skin effect is also called the skin effect. When an alternating current passes through the conductor, the current will concentrate on the surface of the conductor and this phenomenon is called the skin effect. Because when an alternating current flows through the wire, an electromotive force in the direction opposite to the current will be generated inside the wire.

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 Since the center of the wire is larger than the flux linkage on the surface of the wire, the electromotive force generated at the center of the wire is greater than that generated near the surface of the wire. As a result of this action, the current flows on the surface and there is no current in the center. This magnetic field generated by the current of the wire itself causes the wire current to flow on the surface.

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  Considering the skin effect of alternating current, in order to effectively use conductor materials and facilitate heat dissipation, the high-current busbars of power plants are often made into troughs or diamond-shaped busbars; in addition, steel core aluminum stranded wires are used in high-voltage transmission and distribution lines. Aluminum stranded wire not only saves the aluminum wire, but also increases the mechanical strength of the wire.


 These all use the principle of skin effect.

List of single copper busbar specifications and current carrying capacity (the maximum allowable temperature of copper busbar is 70℃)

 

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   Copper bus bar size (cross sectionmm

copper(A

          AC (ambient temperature)

       DC (ambient temperature)

25

30

35

40

25

30

35

40

15 x 3

210

197

185

170

210

197

185

170

20 x 3

275

258

242

223

275

258

242

223

25 x 3

340

320

299

276

340

320

299

276

30 x 4

475

446

418

385

475

446

418

385

40 x 4

625

587

550

506

625

587

550

506

40 x 5

700

659

615

567

705

664

620

571

50 x 5

860

809

756

697

870

818

765

705

50 x 6

955

898

840

774

960

902

845

778

63 x 6

1125

1056

990

912

1145

1079

1010

928

80 x 6

1480

1390

1300

1200

1510

1420

1330

1225

100 x 6

1810

1700

1590

1470

1875

1760

1650

1520

60 x 8

1320

1240

1160

1070

1345

1265

1185

1090

80 x 8

1690

1590

1490

1370

1755

1650

1545

1420

100 x 8

2080

1955

1830

1685

2180

2050

1920

1770

125 x 8

2400

2255

2110

1945

2600

2445

2290

2105

60 x 10

1475

1388

1300

1195

1525

1432

1340

1235

80 x 10

1900

1786

1670

1540

1990

1870

1750

1610

100 x 10

2310

2170

2030

1870

2470

2320

2175

2000

125 x 10

2650

2490

2330

2150

2950

2770

2595

2390

Note: 1. This table is the data of copper bus bar standing. When the copper bus bar is flat and the width is 63mm, the data in the table should be multiplied by 0.95, and >63mm should be multiplied by 0.92.

   2. The ones with "*" are the preferred specifications.

Contact Us

Contact: Leanne

Phone: 0086-13853146766

Tel: 0086-13853146766

Company: LJMC

Add: 4th floor,Pingan group industrail park,Pingan street office,Jinan city ,Shandong