Medium-voltage fire-proof cable
A fire-resistant cable and medium-voltage technology, which is applied in the direction of insulated cables, cables, circuits, etc., can solve the problems of only applicable fire-resistant structures and difficult medium-voltage cables, etc., and achieve the effects of small laying space, lightening the burden, and ensuring the carrying capacity
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[0031] Example 1: Referring to Figure 1, the medium-voltage single-core fire-resistant cable of the present invention has the following structure from the center to the outside: fine copper wire stranded conductor 1, conductor shielding 2, cross-linked polyethylene insulation 3, insulating shielding layer 4. Copper tape or copper wire braided shield 5, 2mm thick glass fiber braided tape wraps the heat insulation layer 6, the 3.5mm thick thermosetting elastomer fire-resistant heat insulation layer 7, and the outer sheath 8.
[0032] Among them, the thermosetting elastomer refractory heat insulation layer is made of 30wt% silicone rubber, 25wt% talc, 30wt% white carbon black, 8wt% boron-containing 500℃ low-temperature frit, 7wt% peroxide vulcanizing agent, which is mixed into plasticity The rubber material is squeezed out of the insulation layer 6 through a rubber extruder, and finally vulcanized.
Example Embodiment
[0033] Embodiment 2: Refer to Figure 2, as in embodiment 1, in which the cable core is composed of three medium-voltage structure insulated cores twisted, and the heat insulation layer 6 is laminated with glass fiber tape and asbestos to a thickness of 1.5mm, extruded The thermosetting elastomer refractory insulation layer has a thickness of 3mm, and the composition is: 38wt% silicone rubber, 45wt% clay filler, 10wt% medium and low temperature frit, and 7wt% peroxide vulcanizing agent.
Example Embodiment
[0034] Embodiment 3: As mentioned above, the heat insulation layer 6 is composed of basalt fiber tape, and the thermosetting elastomer refractory heat insulation layer is composed of: 45% by weight silicone rubber, 40% by weight silica filler, and 10% by weight of medium and low temperature frit. 5wt% platinum chloride compound.
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