CN203118654U - Fireproof radiation-resistant cable for nuclear island of nuclear power station - Google Patents

Abstract

The utility model relates to a fire-resistant and radiation-resistant cable used in a nuclear island of a nuclear power plant. The cable includes, from inside to outside, a single or multiple mutually twisted insulated wire cores, a non-hygroscopic cable tie, a metal tantalum belt and an outer sheath. , the insulated wire cores are Class 5 copper conductors and refractory silicone rubber insulating layers from the inside to the outside; fillers are arranged in the gap between the cable cores, the outer sheath material is phenylene silicone rubber, and the fillers are non-hygroscopic materials . The utility model has high insulation, high fire resistance, high flame retardancy and high radiation resistance, simple structure, simplified process and low production cost.

Description

Fire-resistant and radiation-resistant cables for nuclear islands in nuclear power plants

technical field

The utility model belongs to the technical field of power cables, in particular to a fire-resistant and radiation-resistant cable used for nuclear islands of nuclear power plants. the

Background technique

The cables used in or near the nuclear island of nuclear power plants must have high electrical properties, high flame retardancy and radiation resistance in addition to meeting the electrical and mechanical properties of ordinary cables. At present, the functions of cables used in nuclear power plants are relatively single, and usually use fire-resistant silicone rubber insulation layer, high flame-retardant filling layer, and low-smoke and halogen-free outer sheath. The above performance requirements, long-term radiation can easily cause the aging of the silicone rubber insulation layer, resulting in a decrease in insulation performance and changing the internal performance of the cable. Patent CN 201383373Y discloses a power cable for radiation-resistant low-voltage nuclear power plants, the conductor of which is wrapped with an inner insulating layer and an outer insulating layer, and the outer sheath includes an inner sheath layer, an outer sheath layer and a steel strip winding between There is an isolation layer between the cladding, the cable core and the outer sheath. Although it has anti-radiation properties, the cable structure and production process are complicated and the cost is high. the

Utility model content

Aiming at the above-mentioned defects existing in the existing cables for nuclear power plants, the purpose of this utility model is to provide a fire-resistant and radiation-resistant cable for nuclear islands of nuclear power plants. The cable has high insulation, high fire resistance, high flame retardancy and high radiation resistance, simple structure, simplified process and low production cost.

The technical scheme of the utility model is as follows:

The fire-resistant and radiation-resistant cables used in the nuclear island of nuclear power plants are as follows from the inside to the outside: single or multiple insulated wire cores twisted with each other, non-hygroscopic cable ties, metal tantalum tapes, and outer sheaths; the insulated wire cores are made of From inside to outside, there are five kinds of copper conductors and fire-resistant silicone rubber insulation layers; fillers are arranged in the gaps between the insulated wire cores; the outer sheath material is phenylene silicone rubber.

Its further technical scheme is:

The number of insulated wire cores is 5.

Filling is non-hygroscopic material. the

Compared with the cables used in existing nuclear power plants, the fire-resistant and radiation-resistant cables used in the nuclear island of this nuclear power plant have the following advantages: 

1. The surface of the stranded copper conductor is made of refractory silicone rubber as the insulating layer. This rubber has the characteristics of "ceramicization". After burning by high-temperature flame, it will form a hard shell to protect the cable from damage, thus ensuring the high insulation and high fire resistance of the cable at the same time. and high flame retardancy.

2. There is a layer of metal tantalum tape between the non-hygroscopic cable tie and the outer sheath, which has strong radiation resistance and can effectively shield the radiation in the nuclear island, ensuring that the refractory silicone rubber insulating layer is not affected by radiation and will not age. The insulation performance is reduced, while ensuring that the internal performance of the cable does not change. the

3. The outer sheath made of phenylene silicone rubber is resistant to acid, alkali and rain, which greatly improves the weather resistance of the cable. the

4. The structure is simple, the process is simplified, and the production cost is low. the

Description of drawings

Fig. 1 is the structural representation of the utility model. the

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail. the

As shown in Figure 1, the fire-resistant and radiation-resistant cables used in the nuclear island of this nuclear power plant are as follows from inside to outside: 5 mutually twisted insulated wire cores, non-hygroscopic cable ties 4, metal tantalum tape 5 and outer sheath 6; The insulated wire cores are 5 types of copper conductors 1 and refractory silicone rubber insulating layers 2 from the inside to the outside; fillers 3 are arranged in the gaps between the insulated wire cores; specifically, the material of the outer sheath 6 is phenylene silicon Rubber, filler 3 is non-hygroscopic material. the

In the actual operation process, the metal tantalum belt 5 is resistant to radiation, which can effectively shield the radiation from the nuclear island of the nuclear power plant, and ensure that the refractory silicone rubber insulating layer 2 will not be affected by radiation and cause aging and insulation performance degradation, while ensuring that the internal performance of the cable does not occur. Change; the refractory silicone rubber insulating layer 2 has the characteristics of "ceramicization", which will form a hard shell after high-temperature flame burning to protect the cable from damage, thereby ensuring the high insulation, high fire resistance and high flame retardancy of the cable at the same time ; The material of the outer sheath 6 is selected from phenylene silicone rubber, which is resistant to acid, alkali and rain, which greatly improves the weather resistance of the cable. the

The above description is an explanation of the utility model, not a limitation of the utility model. For the scope limited by the utility model, please refer to the claims. Within the protection scope of the utility model, any form of modification can be made. the

Claims (3)

1. use fire-resistant rdaiation resistant cable in the nuclear island of nuclear power station, it is characterized in that being followed successively by from inside to outside: single or many mutual stranded insulated wire cores, non-hygroscopic band (4), metal tantalum belt (5) and oversheaths (6); Described insulated wire cores is followed successively by 5 class copper conductors (1) and fire-resistant silicon rubber insulating barrier (2) from inside to outside; Gap between described insulated wire cores is provided with filler (3); Oversheath (6) material is phenylene silicone rubber.

2. fire-resistant rdaiation resistant cable according to claim 1, it is characterized in that: the quantity of described insulated wire cores is 5.

3. fire-resistant rdaiation resistant cable according to claim 1, it is characterized in that: filler (3) is non-absorbent material.

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