CN201369187Y - Control cable for nuclear power station - Google Patents

Abstract

The utility model provides a control cable for nuclear power plants, which is characterized in that: a conductive wire core is provided with double-layer insulation, and the cabled wire core is provided with a radiation-resistant halogen-free flame-retardant tape from the inside to the outside. , shielding layer, combined protective layer and radiation-resistant outer sheath, and a non-hygroscopic halogen-free flame-retardant filler is provided between the halogen-free flame-retardant tape and the insulated wire core. Due to the double-layer insulation and protective layer, the control cable also adopts radiation-resistant and flame-retardant insulation and radiation-resistant and flame-retardant outer sheath, which has radiation resistance and excellent flame retardancy. The new insulation and sheath used The material has a long heat-resistant life, complies with the EU RoHS environmental protection directive, and is low-smoke and halogen-free. This control cable is suitable for nuclear power plants.

Description

A control cable for nuclear power plants

Technical field:

The utility model relates to the technical field of cables, in particular to a control cable for nuclear power plants with high flame retardancy, radiation resistance, heat resistance, halogen-free and environmental protection.

Background technique:

In recent years, nuclear power technology has been continuously developed, and the safety, reliability and economy of nuclear power have been continuously improved. The technology, safety and reliability of the wire and cable products used in it are constantly improving.

As one of the important electrical supporting products of nuclear power plants, nuclear-grade cables are used in harsh environments and have strict safety requirements. They are wire and cable varieties that require high performance levels and are difficult to manufacture. In particular, cables for third-generation nuclear power plants are still blank in China.

Compared with general industrial halogen-free flame-retardant cables, the new nuclear power plant cables have higher requirements for various performance indicators, mainly: the aging conditions of insulation and sheath and the rate of change after aging are higher than other cables; the requirements for insulating cores It is flame retardant and can pass the vertical burning test of a single insulated wire core; the service life is required to reach more than 40 years; it is required to have nuclear environmental performance, etc.

Contents of the invention

The purpose of the utility model is to provide a high flame-retardant, radiation-resistant, heat-resistant, halogen-free control cable for nuclear power plants.

In order to achieve the above object, the technical scheme of the utility model is as follows: a control cable for nuclear power plants, which includes a conductive wire core, an insulating layer is provided outside the conductive wire core to form an insulated wire core, and the insulated wire core is twisted into a The cabled core is provided with a shielding layer, a protective layer and a radiation-resistant outer sheath outside the cabled core. A radiation-resistant halogen-free flame-retardant tape, a shielding layer, a protective layer and a radiation-resistant outer sheath are provided outside, and a flame-retardant filler is provided between the halogen-free flame-retardant tape and the insulated wire core.

The utility model is provided with a halogen-free flame-retardant glass fiber filling rope or a dust-free rock wool rope containing an environmentally friendly composite smoke-elimination and flame-retardant filler between the halogen-free flame-retardant belt and the insulating wire core. The control cable adopts an oxygen-insulating heat-resistant layer, a flame-retardant layer and a radiation-resistant layer combined protective layer and radiation-resistant insulation and sheath material, which has radiation resistance and excellent flame-retardant and heat resistance. The new insulating and sheathing materials used have a long thermal life, and the materials comply with the EU RoHS environmental protection directive, low smoke, and halogen-free.

Description of drawings:

Fig. 1 is the sectional view of control cable of the present utility model

Detailed ways

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

The utility model relates to a control cable for nuclear power plants, which includes a conductive wire core 1, the nominal cross section of which is 0.5-10 mm ² , an insulating layer 2 is provided outside the conductive wire core 1 to form an insulating wire core, and then Twisting the insulated wire cores into a cable core, the number of insulated wire cores can be 2 to 61, and a shielding layer 4, a protective layer 5 and an outer sheath 6 are arranged outside the cable core, which is different from the prior art in that : Conductive wire core 1 is provided with double-layer insulation 2 outside, and the outside of the cabled wire core is provided with radiation-resistant halogen-free flame-retardant tape 3, shielding layer 4, protective layer 5 and outer sheath 6 from inside to outside , a flame retardant filler 7 is provided between the halogen-free flame retardant tape 3 and the insulated wire core.

Among them, the conductive wire core should be twisted with copper conductor single wire or tinned copper conductor single wire, and the conductive wire core structure should comply with GB/T3956 (equivalent to IEC 228) Type 2 or Type 5. The conductive wire core adopts a circular non-compressed structure. The double-layer insulation outside the conductive wire core is inner layer insulation and outer layer insulation. The inner layer insulation is radiation-resistant, high-electricity, halogen-free and low-smoke polyolefin or ethylene-propylene rubber insulating material, and the outer layer insulation is radiation-resistant, Highly flame-retardant, halogen-free low-smoke polyolefin or ethylene-propylene rubber insulating material. The volume resistivity of the inner layer insulation at 20°C is ≥1.0×10 ¹⁶ Ω·cm, the limiting oxygen index of the outer layer insulation is ≥32, and the difference between the high and low temperature oxygen index is required to be less than 2, that is |IO _20°C -IO _80°C |<2, to ensure that the flame retardant performance of the material is intact under high temperature or burning conditions. The conductive wire core becomes an insulated wire core after being extruded and insulated, and then the insulated wire core is twisted into a cabled core. The flame-retardant filler arranged between the cores is a halogen-free flame-retardant glass fiber filling rope containing an environmentally friendly composite smoke-suppressing flame-retardant filler or other non-hygroscopic halogen-free flame-retardant fillers. The outside of the flame-retardant tape is the shielding layer 4. According to the needs, braided shielding, copper tape shielding or aluminum-plastic composite tape shielding can be used. Braiding shielding: use 0.12-0.25mm copper wire or tinned copper wire braiding shielding, and the braiding density is not less than 80%; copper tape shielding: use 0.05~0.1mm soft copper tape overlapping wrapping structure; aluminum-plastic composite tape: use 0.05~0.1mm aluminum-plastic composite tape overlapping wrapping, place a cross-section under the aluminum-plastic composite film A round copper wire smaller than 0.2mm ² is used as a drain wire, and the drain wire is a twisted flexible wire with multiple structures. The protective layer 5 has three layers, and the protective layer is a combined structure of an oxygen-insulating heat-resistant glass cloth tape layer, a low-smoke halogen-free flame-retardant tape layer and a radiation-resistant tape layer arranged in sequence. The outer sheath 6 is made of radiation-resistant, highly flame-retardant polyolefin or ethylene-propylene rubber material, requiring the elongation at break of the sheath to be ≥180% before aging, and the elongation at break to be ≥150% after 110±2°C and 10 days of heat aging % to prevent sheath from cracking. The halogen-free flame-retardant polyolefin insulation material and the halogen-free flame-retardant outer sheath material used in the cable all meet the standard requirements after the ⁶⁰ Co-γ ray irradiation test. It has a long heat-resistant life at 90°C and implements EU RoHS Environmental protection directive, with good physical and mechanical properties, insulation properties and excellent flame retardant properties, does not release halogen acid, self-extinguishing when leaving the fire, the cable made of cross-linked has a high degree of safety and reliability.

The protective layer combined with oxygen-insulating heat-resistant glass cloth tape, low-smoke halogen-free flame-retardant tape and radiation-resistant tape is used, and insulation and sheath materials with excellent radiation resistance and flame retardancy are used to ensure The excellent flame retardant performance of the cable also makes the cable have good radiation resistance. The above outer sheath is made of radiation-resistant halogen-free flame-retardant polyolefin or radiation-resistant halogen-free flame-retardant ethylene-propylene rubber.

Claims (9)

1, a kind of control cable that is used for nuclear power station, it comprises conductor wire core, outside conductor wire core, be provided with insulating barrier, form insulated wire cores, becoming the cable core peripheral hardware that screen, overcoat and the oversheath of anti-irradiation are arranged by insulated wire cores is stranded for becoming cable core, it is characterized in that: conductor wire core is provided with double hyer insulation outward, described one-tenth cable core is provided with halogen-free flameproof band, screen, overcoat and the oversheath of anti-irradiation outward from the inside to the outside, is provided with fire-retardant filler between halogen-free flameproof band and insulated wire cores.

2, by the described control cable of claim 1, it is characterized in that: the outer double hyer insulation of conductor wire core is primary insulation and outer layer insulation, primary insulation be anti-irradiation, high electrically, Halogen, low cigarette polyolefin or ethylene propylene rubber insulation material, outer layer insulation is anti-irradiation, high flame retardant, Halogen, low cigarette polyolefin or ethylene propylene rubber insulation material.

3, by the described control cable of claim 1, it is characterized in that: overcoat has three layers, and this overcoat is the combining structure of the oxygen barrier heat resistant glass cloth belting layer, low-smoke non-halogen flame-retardant belting layer and the belting layer of anti-irradiation that set gradually.

4, by the described control cable of claim 1, it is characterized in that: the fire-retardant filler that is provided with between halogen-free flameproof band and insulated wire cores is halogen-free flameproof glass fiber gasket for packing or other non-hygroscopic halogen-free flameproof filler.

5, by the described control cable of claim 1, it is characterized in that: the material that oversheath adopts is irradiation resistant non-halogen fire retardant polyolefin or the fire-retardant ethylene-propylene rubber of irradiation resistant non-halogen.

6, by the described control cable of claim 1, it is characterized in that: conductor wire core adopts conductive copper wire core or tin-coated copper conductor wire core.

7, by the described control cable of claim 1, it is characterized in that: screen adopts copper wire or the tinned copper wire braid shielded of 0.12～0.25mm, and count is not less than 80%.

8, by the described control cable of claim 1, it is characterized in that: screen adopts the copper strips screen, is specially the overlapping wrapped structure of soft copper band of 0.05～0.1mm.

9, by the described control cable of claim 1, it is characterized in that: screen adopts plastic-aluminum combined belt, and the aluminium-plastic tape that is specially 0.05～0.1mm is overlapping wrapped, and aluminium-plastic tape is placed a cross section down and is not less than 0.2mm ²Circular copper wire as drainage thread, this drainage thread is the twisted cord of many root architectures.

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