Differences between copper wire shield and copper tape shield


In the cable structure, is copper wire shielding better or copper tape shielding better?

Let us understand that the shielding layer is mainly used to resist external electromagnetic interference and prevent the electromagnetic field generated by itself from interfering with the surrounding environment and causing fault currents during use.

Depending on the requirements of the use of shielding performance, the materials used are different, such as copper wire braided shield, copper tape wrapped shield, copper wire sparse shield, aluminum alloy wire braided shield, copper clad aluminum wire braided shield, aluminum-plastic composite Tape wrapping and so on. Among them, in order to ensure the continuity of the shielding layer and reduce the transfer resistance of the shielding layer, for copper tape wrapping, aluminum-plastic composite tape wrapping usually requires one or more annealed copper wires to be longitudinally placed in the shielding layer as drain wires.

Copper wire shield

The main direction of the copper wire shielding current is the same as the spiral shape of the copper tape. The copper wire shields the current through a short path and the heat is less. The shielded area with two layers of copper tape increases the shielding cross-section and flows through. With less current, less heat is emitted. It can also play a role in shielding signals. However, for a large current carrying capacity of 500mm2, the electromagnetic field generated by itself is also large. When the short-circuit current exceeds a certain value, the effective cross-section value of the two-layer 0.12mm copper strip cannot reach the copper wire. Larger effective cross-section values ​​that can be achieved with slack.

Copper tape shield

From the above comprehensive considerations, the copper wire shielding effect is much better than other shielding methods, and the continuity is more reliable. Copper wire shielded cables can be used.

However, according to different construction schemes and laying environments, the usage rate of copper tape shielded cables is also high.