CN205376186U - Fine compound medium voltage cable of resistant firelight - Google Patents

Abstract

The utility model relates to a fire-resistant optical fiber composite medium-voltage cable, which is characterized in that: the composite medium-voltage cable is composed of an outer cladding and an inner core, and the inner core is formed by twisting a cable core and an optical cable unit; the optical cable unit is composed of a strengthening member and an optical cable unit. The loose tubes arranged around the reinforcement are twisted into a cable; the cable core is composed of a conductor and an insulating and shielding composite layer extruded outside the conductor; the outer cladding is composed of a heat insulation layer, a refractory layer, an oxygen barrier layer, an impact The outer sheath layer is wrapped successively. The outer diameter of the product is the same as that of ordinary medium-voltage power cables. Without increasing the cost of cable laying, it can simultaneously realize the upper-end connection of power fiber-to-the-home and power line monitoring, early warning and other functions, improve the fault response speed, and reduce the line. maintenance costs.

Description

A fire-resistant optical fiber composite medium voltage cable

technical field

The utility model relates to the technical field of cables, in particular to a fire-resistant optical fiber composite medium-voltage cable.

Background technique

With the rise of the Internet of Things, the market has put forward a new demand for special optical fiber composite cables integrating telecommunications, power transmission, television, Internet, Internet of Things and other multi-network integration functions, making them an important component in the construction of smart grids.

At present, with the rapid development of my country's social economy, there are more and more important engineering facilities such as subways, tunnels, power plants, and nuclear power plants, as well as large supermarkets, exhibition centers, and other crowded places. The system puts forward requirements for the safety performance of 6-35kV cables under fire conditions. It is required that the cables can still maintain normal power supply for a period of time in case of flames, so as to facilitate escape and rescue. Therefore, a fire-resistant optical fiber composite medium-voltage cable is urgently needed.

Contents of the invention

The purpose of this utility model is to provide an improved fire-resistant optical fiber composite medium-voltage cable, which can overcome some shortcomings in the prior art that the cable maintains normal power supply in the case of flames for a short time, which is not conducive to escape and rescue.

In order to achieve the above purpose, the technical solution of the present utility model is: a fire-resistant optical fiber composite medium voltage cable, characterized in that: the composite medium voltage cable is composed of an outer cladding and an inner core, and the inner core is composed of a cable core and an optical cable unit Twisted; the optical cable unit is twisted into a cable by a strengthening member and a loose tube set around the strengthening member; the cable core is composed of a conductor and an insulating and shielding composite layer extruded on the outside of the conductor; The outer cladding layer is successively wrapped by a heat insulation layer, a refractory layer, an oxygen barrier layer, an impact resistance layer and an outer sheath layer.

Preferably, the optical cable unit is provided with a loose tube group consisting of 4-6 loose tubes, and the center of the loose tube group is provided with a reinforcement made of resin fiber reinforced plastic FRP. The outer extruded protective sleeve, each loose tube is equipped with an optical fiber core, and the protective cover is composed of a water blocking tape and an electric tracking sheath. Between the protective sleeve and the loose tube, the loose tube and the reinforcement Water-blocking yarn is filled in between. The outer diameter of the loose tube is 2.0-2.5mm, the wall thickness is greater than or equal to 0.35mm, and each loose tube is provided with 2-12 core optical fibers.

Preferably, the inner core adopts three cable cores, and the three cable cores are arranged in a triangle, and an optical cable unit is arranged on one side of the triangle; the insulation shielding composite layer is formed by wrapping the conductor shielding layer, the insulating layer and the insulating shielding layer in sequence, The outer side of the insulating and shielding composite layer is wrapped with a metal shielding layer.

More preferably, an alkali-free glass rope is filled between the heat insulation layer and the inner core, between the cable core of the inner core and the optical cable unit, and the surface of the alkali-free glass rope is coated with nanometer aluminum hydroxide, The heat insulation layer is made of alkali-free glass fiber tape, with a thickness of 0.4-0.6mm; the refractory layer is made of ceramic polyolefin material extruded on the heat insulation layer, and the thickness of the refractory layer is 2-4mm; The layer is made of low-smoke halogen-free oxygen barrier material, which is extruded on the refractory layer with a thickness of 1.2-2.2mm.

When in use, the product of the utility model has the functions of information communication and power transmission at the same time. The optical unit adopts a non-metallic structure and is directly compounded on the side of the cable core of the power cable. The outer diameter of the product is the same as that of ordinary medium-voltage power cables. Without increasing the cost of cable laying, it can simultaneously realize the power fiber-to-the-home. Upper connection and power line monitoring, early warning and other functions can improve the fault response speed and reduce the maintenance cost of the line.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Fig. 2 is a structural schematic diagram of the optical cable unit of the present invention.

detailed description

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

The reference numerals in each accompanying drawing represent as follows:

1 optical cable unit, 11 loose tube, 12 water blocking yarn, 13 reinforcement, 14 optical fiber, 15 water blocking tape, 16 tracking resistance sheath;

2 cable core, 21 conductor, 22 conductor shielding layer, 23 insulating layer, 24 insulating shielding layer, 25 metal shielding layer;

3 E-glass rope, 4 heat insulation layer, 5 refractory layer, 6 oxygen barrier layer, 7 impact resistance layer, 8 outer sheath layer.

The fire-resistant optical fiber composite medium-voltage cable described in the utility model is different from the prior art in that: the composite medium-voltage cable is composed of an outer cladding and an inner core, and the inner core is twisted by a cable core and an optical cable unit Formed; the optical cable unit is twisted into a cable by a strengthening member and a loose tube set around the strengthening member; the cable core is composed of a conductor and an insulating and shielding composite layer extruded on the outside of the conductor; the described The outer cladding is composed of heat insulation layer, refractory layer, oxygen barrier layer, impact resistance layer and outer sheath layer.

Further, the optical cable unit is provided with a loose tube group composed of 4-6 loose tubes, and the center of the loose tube group is provided with a reinforcement made of resin fiber reinforced plastic FRP. The outer extruded protective sleeve, each loose tube is equipped with an optical fiber core, and the protective cover is composed of a water blocking tape and an electric tracking sheath. Between the protective sleeve and the loose tube, the loose tube and the reinforcement Water-blocking yarn is filled in between. The outer diameter of the loose tube is 2.0-2.5mm, the wall thickness is greater than or equal to 0.35mm, and each loose tube is provided with 2-12 core optical fibers.

Further, the inner core adopts three cable cores, and the three cable cores are arranged in a triangle, and an optical cable unit is arranged on one side of the triangle; the insulation shielding composite layer is wrapped in turn by a conductor shielding layer, an insulating layer and an insulating shielding layer. The outer side of the shielding composite layer is wrapped with a metal shielding layer. The thickness ratio of the conductor shielding layer, the insulating layer and the insulating shielding layer is 1:5:1; the metal shielding layer is formed by overlapping and wrapping copper tapes.

Furthermore, between the heat insulation layer and the inner core, between the cable core of the inner core and the optical cable unit is filled with an alkali-free glass rope, and the surface of the alkali-free glass rope is coated with nano-aluminum hydroxide. The heat layer is made of alkali-free glass fiber tape, with a thickness of 0.4-0.6mm; the refractory layer is made of ceramic polyolefin material extruded on the heat insulation layer, and the thickness of the refractory layer is 2-4mm; the oxygen barrier layer Low-smoke, halogen-free, and oxygen-insulating materials are used, extruded on the refractory layer, with a thickness of 1.2-2.2mm.

The anti-shock layer is made of three layers of steel strips, which are wrapped on the oxygen barrier layer by covering the gaps. The steel strips are made of stainless steel strips or galvanized steel strips; the outer sheath is made of flame-retardant polyethylene or low-smoke halogen-free sheath materials. The thickness is 1.8-2.5mm; the insulating layer is extruded with low-smoke halogen-free cross-linked polyethylene insulating material.

This product has the following advantages:

1. The product has both information communication and power transmission functions. The optical unit adopts a non-metallic structure and is directly compounded on the side of the cable core of the power cable. The outer diameter of the product is the same as that of ordinary medium-voltage power cables. Without increasing the cost of cable laying, it can simultaneously realize the power fiber-to-the-home. Upper connection and power line monitoring, early warning and other functions can improve the fault response speed and reduce the maintenance cost of the line.

1. Excellent fire resistance: under the rated working voltage of the cable, the flame temperature is not lower than 750°C, and the fuse will not break within 90 minutes of the fire supply time.

2. Economical: Reasonable structure design and selection of suitable fire-resistant and fire-resistant materials not only meet the needs of fire-resistant cables, but also consider material selection, structural size, and electrical performance, and at the same time achieve the purpose of reducing costs.

3. Environmentally friendly: no heavy metals, non-toxic, tasteless, no impact on the human body and the environment; anti-ants, anti-rat bites, waterproof, oil-resistant.

4. Good heat insulation, thermal conductivity 0.09W/Mk, especially after ablation, the interior is uniform honeycomb, which has better fire resistance and heat insulation.

Example

1. Cable core

1.1 Conductor stranding. The circular compacted copper conductor is adopted, and the conductor structure is dense. Under the same cross-sectional area of the conductor, the outer diameter of the conductor after compaction is reduced by about 10%, thereby reducing the outer diameter of the product and facilitating installation and laying.

1.2 Three-layer co-extrusion. Conductor shielding layer, insulation layer, and insulation shielding layer adopt a three-layer co-extrusion production method. The conductor shielding material, cross-linked polyethylene insulation material, and insulation shielding material are coated on the compact conductor at one time, and the extrusion production process is adopted. , so that the three layers of materials are closely combined, while avoiding secondary pollution of insulating materials, ensuring the process quality of the product.

1.3 Metal shielding. Overlap and wrap a layer of 0.1-0.12mm copper tape on each insulated core to shield electric field interference and balance the electric field. In addition to ensuring that the insulating shield (semi-conductive shield) is at ground potential (neutral point), it can also prevent ground faults current passes through.

2. Optical cable unit

2.1 Optical fiber loose tube. The outer diameter of the loose tube is φ2.0～φ2.5mm, the wall thickness is ≥0.35mm, and each tube has 2～12 cores of optical fiber. The concentricity meets the standard requirements. Optical fiber excess length: 2‰-3‰. The fiber paste filling of the bundle tube should meet the drip test requirements.

2.2 Loose tubes are twisted into cables. Stranded structure, the center uses non-metallic reinforcement FRP; the cable core is filled with water-blocking cable paste and covered with a layer of water-blocking tape.

2.3 Extruded outer sheath. The sheath is made of AT tracking-resistant sheath material, and the thickness of the sheath is 1.8-2.5mm.

3. Product mix

For the three-core cable, it is cabled after metal shielding, and at the same time wrapped with a flame-retardant halogen-free tape, the thickness of the wrap is 0.4-0.6mm. The flame-retardant halogen-free tape is environmentally friendly and non-toxic, has high temperature resistance, fire resistance, and excellent heat insulation performance. In the cabling process, three cable cores are twisted around the center, and the optical cable unit is used as a core to fill the gaps in the three cable cores. The remaining gaps are filled with halogen-free non-absorbent filling rope.

4. Insulation layer. For a single-core cable, the metal shield is wrapped with an alkali-free glass tape, with a thickness of 0.4-0.6mm; for a three-core cable, the three cores are cabled after the metal shield, and the gap between the cores is filled with an alkali-free glass rope. Glass ribbon, wrapping thickness 0.4 ~ 0.6mm. The fiberglass tape is environmentally friendly and non-toxic, has high temperature resistance and fire resistance, and has excellent heat insulation performance.

5. Refractory layer. The refractory layer is extruded on the heat insulation layer with ceramic polyolefin material. The horizontal combustion of ceramic polyolefin material can self-extinguish without delaying combustion, and the oxygen index is above 35; at 350-1600 ℃ with flame or without flame, no Melting, no dripping, no falling off, no secondary fire, can be fired into a hard ceramic-like armor, the higher the temperature and the longer the time, the harder the ceramic-like armor after firing, the residue is ceramic inorganic matter, The residual amount is more than 80%, and the ceramic-like armor body can form honeycomb ceramic micropores, which can play a good role in fire and heat insulation, and its excellent flame retardancy can also play a good role in fire prevention.

6. Oxygen barrier layer. It is covered on the refractory layer by extrusion, with a thickness of 1.2-2.2mm. The material is a low-smoke, halogen-free oxygen barrier material with an oxygen index of not less than 45. The material is filled with a large amount of hydrated metal oxide. When heated, the water molecules evaporate and absorb most of the heat, which can reduce the temperature of the cable and the formed water molecules can be diluted. The concentration of oxygen around the cable, the burning metal oxide products form a hard shell, covering the outside of the cable core, preventing flames and heat from spreading to the inside of the cable. At the same time, the oxygen barrier layer acts as an isolation sleeve.

7. Impact-resistant layer. It is wrapped on the oxygen barrier layer by two-layer gap covering method. According to different specifications, 0.2mm, 0.5mm, and 0.8mm steel strips are selected for thickness. For single-core cables, use stainless steel strips; for three-core cables, use galvanized steel strips. Steel tape armor, one can resist impact, and the other can block flames.

8. Outer sheath. The outer sheath is extruded on the steel tape armor layer by extrusion, with a thickness of 2-5mm. According to different needs, flame-retardant polyethylene or low-smoke halogen-free sheathing materials can be selected. The outer sheath provides protection.

The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be assumed that the specific implementation of the utility model is limited to the above descriptions. For a person of ordinary skill in the technical field to which the utility model belongs, without departing from the concept of the utility model, some simple deduction or substitutions can also be made, which should be regarded as belonging to the protection scope of the utility model.

Claims (7)

1. a fire-resistant optical fiber composite medium-pressure cable, it is characterised in that: described composite medium-pressure cable is made up of surrounding layer and inner core, and inner core is formed by cable core and optical cable unit are stranded；

Described optical cable unit is by a reinforcement and the Loose tube group twisted synthesizing cable being located at reinforcement surrounding；

Described cable core is by conductor and is extruded in the insulation shielding composite bed outside conductor and constitutes；

Described surrounding layer is wrapped up successively by thermal insulation layer, flame retardant coating, oxygen barrier layer, anti-impacting layer and external sheath layer and forming.

2. the fire-resistant optical fiber composite medium-pressure cable of one according to claim 1, it is characterised in that: optical cable unit is provided with the Loose tube group of 4-6 Loose tube composition, and the center of Loose tube group is provided with the resin fibre reinforced plastics FRP reinforcement made,

Described, the outside of Loose tube group extrudes protection set, is equipped with optical fiber cable core in each Loose tube, and protection set is made up of waterstop and resistance to electricity trace sheath, between described protection set and Loose tube, is filled with water blocking yarn between Loose tube and reinforcement.

3. the fire-resistant optical fiber composite medium-pressure cable of one according to claim 1, it is characterised in that: inner core adopts three cable cores, and three cable cores are arranged in triangle, and arranges optical cable unit at a side of triangle；

Insulation shielding composite bed is wrapped up successively by conductor shield, insulating barrier and insulation screen and forming, and is enclosed with metal screen layer outside insulation shielding composite bed.

4. the fire-resistant optical fiber composite medium-pressure cable of one according to claim 2, it is characterised in that: described Loose tube external diameter is 2.0-2.5mm, and wall thickness, be more than or equal to 0.35mm, is provided with 2～12 core fibres in each Loose tube.

5. the fire-resistant optical fiber composite medium-pressure cable of one according to claim 1, it is characterized in that: between described thermal insulation layer and inner core, it is filled with alkali-free glass rope between cable core and the optical cable unit of inner core, described alkali-free glass rope surface-coated has nano-aluminum hydroxide, thermal insulation layer is formed by alkali-free glass fibre band is wrapped, and thickness is 0.4-0.6mm；

Flame retardant coating adopts ceramic polyolefin material to be extruded on thermal insulation layer and make, and the thickness of flame retardant coating is 2-4mm；

Oxygen barrier layer adopts low smoke and zero halogen oxygen barrier material, is extruded on flame retardant coating, and thickness is 1.2～2.2mm.

6. the fire-resistant optical fiber composite medium-pressure cable of one according to claim 1, it is characterised in that: anti-impacting layer adopts compound steel band gap to put up mode and makes in oxygen barrier layer around wrapping in, and steel band adopts stainless steel belt or galvanized steel strip；Oversheath flame-proof polyethylene goods low smoke and zero halogen protective cover material is made, and thickness is 1.8-2.5mm；

Insulating barrier adopts low smoke and zero halogen cross-linked polyethylene insulating material to extrude and forms.

7. the fire-resistant optical fiber composite medium-pressure cable of one according to claim 3, it is characterised in that: the ratio of the thickness of conductor shield, insulating barrier and insulation screen is 1:5:1；Described metal screen layer employing copper strips is overlapping wrapped to be formed.