CN205318875U - High temperature and high voltage resistant cables - Google Patents

Abstract

The utility model belongs to the cable field, in particular to high temperature resistant high voltage resistant cable, including copper conductor and the restrictive coating of parcel outside the copper conductor, this restrictive coating includes high temperature resistant fluoroplastic insulating layer, mica band layer, the fire-retardant polyolefin inner sheath of low smoke and zero halogen that sets gradually from inside to outside, weaves shielding layer, the fire-retardant polyolefin outer sheath of low smoke and zero halogen, wear-resisting fluoroplastics oversheath. The high-temperature resistant fluoroplastic can improve the high-temperature resistance of the cable, and the temperature resistance level reaches 260 ℃; the mica tape is wrapped, so that the insulation performance and the high voltage resistance of the cable can be improved; and the outermost layer is also wrapped by wear-resistant fluoroplastic, so that the wear resistance of the cable is improved, and the fluoroplastic has self-extinguishing property, so that flame diffusion can be prevented once the cable is ignited. In conclusion, the structure can protect the cable at multiple angles, and can effectively reduce the influence of high temperature and high voltage generated when the conductor is electrified or the influence of the external severe environment on the service life of the cable.

Description

High temperature and high voltage resistant cables

technical field

The utility model belongs to the field of cables, in particular to high temperature and high voltage resistant cables.

Background technique

With the rapid development of my country's economy, my country's subway, nuclear power plant, optoelectronic communication and other fields have developed at an unprecedented speed, and the amount of electricity has also increased rapidly. Subsequently, various large-scale power plants have emerged as the times require, and the performance of transmission cables is also undergoing unprecedented tests. For the field of ultra-high voltage electric energy transmission, especially in the field of nuclear power, the wires will generate a lot of heat during the working process and cause the cable to heat up. The cables of traditional materials are prone to aging and cracking under such high temperature and high voltage conditions for a long time. The wires will be exposed outside, and the harsh environment outside the cable will always damage the protective layer of the cable, causing major safety hazards to people's lives and property.

Utility model content

The purpose of the utility model is to provide a high temperature and high voltage resistant cable which can be used for a long time under high temperature, high voltage and harsh environment.

In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

High temperature and high voltage resistant cable, including a copper conductor and a sheath layer wrapped around the copper conductor, the sheath layer includes a high temperature resistant fluoroplastic insulation layer, a mica tape layer, a low smoke and halogen Flame-retardant polyolefin inner sheath, braided shielding layer, low-smoke halogen-free flame-retardant polyolefin outer sheath and wear-resistant fluoroplastic outer sheath.

Among them, the copper conductor is a high-purity oxygen-free copper rod.

Among them, the high temperature resistant fluoroplastic insulating layer is a fusible polytetrafluoroethylene insulating layer.

Among them, the mica tape layer is composed of phlogopite tape and synthetic mica tape.

Wherein, the mica tape layer is longitudinally wrapped in the high temperature resistant fluoroplastic insulating layer.

Among them, the braided shielding layer is made of copper-clad magnesium-aluminum alloy wires with a diameter of 0.1mm~0.2mm.

Among them, the volume of copper in the copper-clad magnesium-aluminum alloy wire accounts for 20% to 40% of the volume of the copper-clad magnesium-aluminum alloy wire.

Among them, the wear-resistant fluoroplastic outer sheath is an oil-proof and anti-corrosion polytetrafluoroethylene outer sheath.

Compared with the prior art, the beneficial effects of the utility model are:

The high temperature and high voltage resistant cable of the utility model comprises a copper conductor and a sheath layer wrapped outside the copper conductor. The sheath layer includes a high temperature resistant fluoroplastic insulating layer, a mica tape layer, a low Smoke-free, halogen-free, flame-retardant polyolefin inner sheath, braided shielding layer, low-smoke, halogen-free, flame-retardant polyolefin outer sheath, and wear-resistant fluoroplastic outer sheath. High-temperature-resistant fluoroplastics can prevent the improvement of the high-temperature resistance of the cable, and the temperature-resistant grade can reach 260°C; wrapped with mica tape can improve the insulation performance and high-voltage resistance of the cable; the inner and outer sheaths can increase the strength of the cable; the braided shielding layer It can play the role of grounding protection and shield the electromagnetic field generated by the current in the cable; the outermost layer is also wrapped with wear-resistant fluoroplastics to increase the wear resistance of the cable, and fluoroplastics are self-extinguishing, once the cable catches fire Also prevents flame spread. To sum up, the above-mentioned structure can protect the cable from multiple angles, and can effectively reduce the impact on the service life of the cable from the high temperature and high voltage generated when the conductor is energized or the harsh external environment.

Description of drawings

Accompanying drawing is used for providing further understanding to the utility model, is used for explaining the utility model together with the embodiment of the utility model, does not constitute the limitation of the utility model, in the accompanying drawing:

Fig. 1 is a structural schematic diagram of the high temperature and high voltage resistant cable of the present invention.

Reference signs include:

1——Oxygen-free copper rod;

2——fusible polytetrafluoroethylene insulation layer;

3——mica tape layer;

4——Low-smoke, halogen-free, flame-retardant polyolefin inner sheath;

5 - braided shielding layer;

6—Low-smoke, halogen-free, flame-retardant polyolefin outer sheath;

7——Oil-proof and anti-corrosion PTFE outer sheath.

detailed description

The preferred embodiments of the present utility model are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present utility model, and are not intended to limit the present utility model.

The high temperature and high voltage resistant cable of the utility model includes a copper conductor (that is, an oxygen-free copper rod 1) and a sheath layer wrapped outside the copper conductor. layer (i.e. fusible polytetrafluoroethylene insulating layer 2), mica tape layer 3, LSZH flame retardant polyolefin inner sheath 4, braided shielding layer 5, LSZH flame retardant polyolefin outer sheath 6 and the wear-resistant fluoroplastic outer sheath (that is, the oil-proof and anti-corrosion polytetrafluoroethylene outer sheath 7).

Specifically, the copper conductor is a high-purity oxygen-free copper rod 1 , which has a small resistivity and can reduce heat generation.

Specifically, the high-temperature-resistant fluoroplastic insulating layer is a fusible polytetrafluoroethylene insulating layer 2, which has better stress resistance and crack resistance.

Specifically, the mica-wrapped layer 3 is composed of a phlogopite tape and a synthetic mica tape. Phlogopite mica tape has good fire resistance, acid and alkali resistance, corona resistance, and radiation resistance, and has good flexibility and tensile strength. The cable wrapped with phlogopite mica tape can be used at a temperature of 840°C and a voltage of 1000V. Under these conditions, no breakdown can be guaranteed for 90 minutes; while the synthetic mica tape has the advantages of phlogopite mica tape, it has a high heat resistance level and can reach Class A fire resistance level (950-1000°C); the two mica tapes are composited into a double layer Mica tape can meet the requirements of high temperature resistance and high voltage resistance. The mica tape layer 3 is longitudinally wrapped outside the fusible polytetrafluoroethylene insulating layer 2, and the longitudinal wrapping method can reduce the overlap of the mica tape, save materials, and make the overall thickness of the cable uniform.

Specifically, the braided shielding layer 5 is made of a copper-clad magnesium-aluminum alloy wire with a diameter of 0.1 mm to 0.2 mm, and the copper volume of this copper-clad magnesium-aluminum alloy wire accounts for 20% to 40 %. In this embodiment, the diameter of the copper-clad magnesium-aluminum alloy wire is 0.15mm, and the volume of copper accounts for 30% of the volume of the copper-clad magnesium-aluminum alloy wire, which is compared with the common copper-clad magnesium-aluminum alloy wire whose volume accounts for 15%. Wire, this kind of alloy wire increases the volume ratio of copper, so that the alloy wire has a lower resistivity, and also improves the tensile strength of the alloy wire. The braided shielding layer made of this alloy wire has a good shielding effect and is also Improve the tensile strength of the cable.

Specifically, the wear-resistant fluoroplastic outer sheath is an oil-proof and anti-corrosion polytetrafluoroethylene outer sheath 7, which has high chemical stability and can almost resist the corrosion of all common strong acids, strong alkalis or hydroxide chemicals. It also has the characteristics of high temperature resistance and wear resistance, and is an ideal oil-proof, anti-corrosion and high-temperature resistant material.

The performance indicators of the high temperature and high voltage resistant cable of the present utility model are as follows after testing: insulation tensile strength is 25.5MPa; The strength is 23.9MPa, and the elongation rate after insulation aging is 215%; the thermal deformation rate of the sheath is 35% at 136°C; 1 hour of high temperature impact at 180°C can keep the cable from cracking; and the flame retardant performance has passed IEC60332- 1 standard.

To sum up, the above-mentioned structure can protect the cable from multiple angles, and can effectively reduce the impact of high temperature, high voltage or harsh environment on the service life of the cable.

Finally, it should be noted that the above are only preferred embodiments of the utility model, and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the embodiments, for those skilled in the art, it is still It is possible to modify the technical solutions recorded in the foregoing embodiments, or to perform equivalent replacements on some of the technical features, but within the spirit and principles of the present utility model, any modifications, equivalent replacements, improvements, etc. Included within the protection scope of the present utility model.

Claims (8)

1. High temperature and high voltage resistant cable, including a copper conductor and a sheath layer wrapped outside the copper conductor, characterized in that: the sheath layer includes a high temperature resistant fluoroplastic insulating layer, mica Tape layer, LSZH flame retardant polyolefin inner sheath, braided shielding layer, LSZH flame retardant polyolefin outer sheath and wear-resistant fluoroplastic outer sheath. 2. The high temperature and high voltage resistant cable according to claim 1, characterized in that: the copper conductor is a high-purity oxygen-free copper rod. 3. The high temperature and high voltage resistant cable according to claim 1, characterized in that: the high temperature resistant fluoroplastic insulating layer is a fusible polytetrafluoroethylene insulating layer. 4. The high temperature and high voltage resistant cable according to claim 1, characterized in that: the mica tape layer is composed of phlogopite mica tape and synthetic mica tape. 5. The high temperature and high voltage resistant cable according to claim 1, characterized in that: the mica tape layer is longitudinally wrapped on the high temperature resistant fluoroplastic insulating layer. 6. The high temperature and high voltage resistant cable according to claim 1, characterized in that: the braided shielding layer is braided by copper-clad magnesium-aluminum alloy wires with a diameter of 0.1mm-0.2mm. 7. The high temperature and high voltage resistant cable according to claim 6, characterized in that: the volume of copper in the copper-clad magnesium-aluminum alloy wire accounts for 20%-40% of the volume of the copper-clad magnesium-aluminum alloy wire. 8. The high temperature and high voltage resistant cable according to claim 1, characterized in that: the wear-resistant fluoroplastic outer sheath is an oil-proof and anti-corrosion polytetrafluoroethylene outer sheath.