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If two copper foil shields with a thickness of more than 0.12 are used instead of a copper wire shield for production, would that be possible?
The author believes that the shielding layer mainly resists external electromagnetic interference and prevents the electromagnetic field generated by itself from interfering with the surrounding environment and the fault current.
According to the requirements of the occasion of the shielding performance, the materials used are also different, such as copper braided shield, copper shielded cable , copper wire shielding, aluminum alloy wire braided shield, copper clad aluminum wire braided shield, aluminum plastic composite tape winding Packet shielding and so on. In order to ensure the continuity of the shielding layer and reduce the transfer resistance of the shielding layer, the wrapping of the copper tape requires that one or more annealed copper wires be placed longitudinally in the shielding layer as a drainage line. The shielding properties are often measured by measuring the suppression coefficient (R) of the shielding layer. Copper wire braided shield R=0.07> Copper tape wrapped shield R=0.02> Copper wire twisted (reverse tie wire) R=0.01
For the 500mm2 large current carrying capacity, the electromagnetic field generated by itself is also relatively large. In the case of meeting the short-circuit current, copper wire or copper tape shielding can be used, but from the above comprehensive considerations, the copper wire is loosely wound (plus reverse Cables) The sparse winding effect is much better than other shielding methods, and the continuity is more reliable, so the copper wire is used to bypass the shielding.
Large diameter 35KV cable shield can use two copper strip instead of copper wire
In GB/T12706.3-2002, the single-core of a 35kV power cable is required to be shielded with a 0.12 mm thick copper tape, and G/A of the cable shielding structure of Annex G (Appendix C) of GB/T 12703.3-2002 is added: The metal shield G4.2 copper wire shield is composed of loosely wound soft copper wire. The surface of the copper wire is coated with a reverse-wrapped copper wire or copper tape. The average gap between adjacent copper wires should be no more than 4mm, any two adjacent Copper wire gap should not exceed 8mm. The nominal cross section of the copper wire shield can be selected according to the fault current capacity requirements. Metal shielding of cables with a nominal cross section of 500 mm2 and above shall be shielded with copper wire.