Heat-resistant control cable utilized by nuclear power station

Abstract

The invention relates to a heat-resistant control cable utilized by a nuclear power station. The heat-resistant control cable comprises a combined cable core and a coating. The combined cable core is formed by cable core wires according to a normal intertwisting mode; and the cable core wire comprises a core wire conductor and a double insulating layer, wherein the double insulating layer is wrapped at a peripheral portion of the core wire conductor. The coating is successively formed by a polyolefin filler, a polyester film separating layer, a shielding layer, a glass fiber flame retardant belt, a crosslinking polyethylene blanket, and a ceramic fireproof silicone rubber oversheath from inside to outside, wherein the shielding layer is woven by tin-coated copper wires. The filler is arranged on an intertwisting structure of the combined cable core. The core wire conductor is formed by tin-coated copper filaments or bunched wires formed by the tin-coated copper filaments according to a normal left-hand intertwisting mode. According to the invention, a high insulating property of the cable is ensured and a flame retardation requirement of the cable is also met; besides, a working temperature grade is substantially improved; a cable current-carrying capacity is increased; and a cable operation power is enhanced; meanwhile, the heat-resistant control cable has good performances of radiation resistance, low smoke, and halogen free performance.

Description

technical field [0001] The invention relates to cables, in particular to a control signal cable for nuclear power plants. Background technique [0002] Compared with control signal cables used in general occasions, special control signal cables for nuclear power plants are required to have better heat resistance, radiation resistance, moisture resistance, and corrosion resistance. For example, the minimum operating temperature of conductors required by nuclear power plants is 90°C. During operation, the cable will receive a continuous radiation dose of 10rad / h, and the radiation dose can reach 70×10 in an accident state 6 rad. In the major nuclear power plants that have been put into operation and are currently under construction, the K3 nuclear grade cables outside the containment have begun to be gradually localized. Localization has not been fully realized, and a considerable part relies on imports. [0003] Application numbers are CN200810138007.4, CN200620162415.X, C...

AI Technical Summary

Problems solved by technology

[0003] Application numbers are CN200810138007.4, CN200620162415.X, CN200610042387.2, CN200910219914.6, CN201010187012.1, and CN200620072438.1. Modified thermoplastic resins such as polyethylene, these materials have a high oxygen index and good flame retardancy, which can delay and retard the development of flames, but their high temperature resistance is poor, and it is difficult to maintain the integrity of the cable line in case of fire

Images