High current-carrying capacity low conduction temperature fire resistant cable for accident network analysis and preparation technology

Abstract

The invention discloses a high current-carrying capacity low conduction temperature fire resistant cable for accident network analysis and a preparation technology. A ceramic composite belt is wrapped on the outer surface of a cable core; a high thermal resistance low smoke zero halogen polyolefin sheath layer is coated on the outer surface of the ceramic composite belt; and the high thermal resistance low smoke zero halogen polyolefin sheath layer comprises the following components in parts by weight: 80 to 100 parts of ethylvinylacetate, 5 to 20 parts of ethylene-propylene diene copolymer EPDM, 150 to 200 parts of aluminium hydroxide, 0.5 to 1.5 parts of stearic acid Hst, 1.5 to 2.0 parts of release agent, 2.0 to 3.0 parts of high abrasion carbon black, 1.0 to 2.0 parts of coupling agent, 3.0 to 4.0 parts of dicumyl peroxide, 2.5 to 3.5 parts of accelerating agent TA2C, 7 to 9 parts of dioctyl adipate, and 0.3 to 1.4 parts of auxiliary curing agent cyanuric acid triallyl ester. The cable can reduce the diameter of a copper conductor, and lock a great amount of heat produced by the copper conductor in the cable core, thereby ensuring that the surface temperature of the sheath layer is not over 70 DEG C.

Description

technical field [0001] The invention relates to a high-current-carrying capacity fire-resistant power cable, and also relates to a preparation process of the high-carrying-capacity fire-resistant power cable. Background technique [0002] In the field of marine engineering, island engineering, and especially ships with national defense purposes, emergency networks are equipped to transmit power in the event of an accident, so as to ensure the power transmission of related equipment. At present, these cables are all flame-retardant cables, the specifications are about 3*70, the current carrying capacity is about 150A, and the surface temperature of the sheath is not allowed to exceed 70 °C (the temperature requirements are very strict, because in the event of an emergency After that, you need to drag the cable out of the reel by hand and insert it into the relevant system, the temperature is too high to be held by your hand), and the outer diameter is about 40.0mm; [0003] ...

AI Technical Summary

Problems solved by technology

After this requirement, there is a very great difficulty in technical development, because (1) the carrying capacity remains unchanged, and the specification is changed from 70mm 2 down to 25mm 2 When the temperature is high, the heat of the conductor will increase significantly. When the working environment temperature is 50°C, the temperature transmitted to the surface of the sheath will greatly exceed 70°C (we have done tests with ordinary cables, and the temperature is finally at 108°C); (2) The cable specification is doubled, the outer diameter of the cable is required to be reduced, the ampacity of the cable and the surface temperature of the sheath remain unchanged, and the cable is also required to be fire-resistant, which is very difficult for the realization of the cable

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