CN204695811U - A kind of control bus be applied in photovoltaic generation supervisory control system - Google Patents

Abstract

The utility model relates to the technical field of cables, in particular to a control bus used in a photovoltaic power generation monitoring system. One of the utility models is used in the control bus of the photovoltaic power generation monitoring system. The inner skin layer is equipped with a low-density first polyolefin material body to protect the conductor, and the outer skin layer is equipped with a high-density second polyolefin material body. , so that the structure of the conductor is stable, and the flame-retardant filler is set in the insulating layer between the inner skin layer and the outer skin layer, so that there is a buffer space for the inner skin layer and the outer skin layer, and it can also ensure that the transmission performance of the conductor is not damaged. The aluminum foil layer of the shielding body is equipped with aluminum foil, which is mainly used for moisture-proof, and can prevent water vapor, air, ultraviolet rays, bacteria, etc. from entering the core. The outer sheath layer of the jacket is provided with a ceramic polymer material body, which is mainly used for fire and heat insulation. The utility model relates to a control bus used in a photovoltaic power generation monitoring system, which is environmentally friendly, flame-retardant, fire-resistant and strong in resistance.

Description

A control bus applied in photovoltaic power generation monitoring system

technical field

The utility model relates to the technical field of cables, in particular to a control bus used in a photovoltaic power generation monitoring system.

Background technique

With the rapid development of my country's economy, my country's high-rise buildings, subways, nuclear power plants, shipbuilding, optoelectronic communications, etc. are developing at an unprecedented speed, and the consumption of wires and cables has also increased rapidly. Wires and cables for fixed wiring of various construction projects in China are products with a large quantity and a wide range, not only involving thousands of households, but also industrial plants, commercial, office buildings, entertainment, petroleum, mines, ships and other occasions with high fire safety conditions At present, wires and cables for fixed wiring in construction projects are mainly polyvinyl chloride insulated cables represented by PVC in the world, that is, some products included in the national standard GB/T5023-2008 and the machinery industry standard JB/T8734-2012. Most of the insulating layers of the insulation layer are made of halogen-containing insulating materials, so once a fire occurs, it will spread and burn, and produce a large amount of smoke and harmful corrosive hydrogen halide gas, forming a "secondary disaster"; The problem has become the focus of public attention. In the place where the fire occurs, the harmful and corrosive hydrogen halide gas will also cause great harm to the disaster relief personnel. Therefore, in Europe, the United States, Japan and other developed countries, they attach great importance to the pollution related to electric wires and cables. A series of strict laws have been enacted. Our country also stipulates that non-environmentally friendly cables such as PVC should not be used in large and medium-sized buildings and public places. Environmentally friendly building materials, including environmentally friendly cables, are also used in large-scale projects such as Olympic projects. Now China's construction industry , Electronics and other fields have also issued corresponding environmental protection laws and regulations.

Recently, the National Energy Administration issued the "2015 Photovoltaic Power Generation Construction Implementation Plan", proposing that the annual new photovoltaic construction target is 17.8GW, which is 68% higher than the actual completion of last year. As the focus of photovoltaic development, distributed photovoltaic power generation on the roof and all self-use ground distributed photovoltaic power generation projects will not limit the construction scale. Industry insiders believe that the policy is unprecedented. , the construction of photovoltaic power plants, especially distributed photovoltaic power plants, will usher in a profit turning point, and will benefit the entire industrial chain. If the photovoltaic power station is calculated at 8.5 yuan per watt, the photovoltaic terminal market in 2015 will expand the investment scale of about 61.2 billion yuan. By the end of 2015, the installed capacity of solar power generation will reach more than 21GW, and the annual power generation will reach 250kwh. In the construction and operation of distributed photovoltaic systems, owners and power grid companies have put forward higher requirements for timely monitoring of equipment. Photovoltaic power stations above the megawatt level occupy a large area, with a large number and types of equipment, and centralized construction. At present, the most widely used method is wired monitoring. The overall structure includes three parts: data collection, data transmission, and data storage and processing. The role of the transmission part cannot be ignored. Traditional data cables for photovoltaic systems have basic low-smoke, halogen-free flame-retardant properties, and the flame-retardant level is only ordinary C. Therefore, the data transmission lines connected between equipment and monitoring centers must , for environmental protection, flame retardant effect and fire resistance. Through the use of new materials, the product has a wide range of real-time performance, reliability and scalability, and fire resistance is more suitable for building photovoltaic power generation monitoring systems to solve data transmission between equipment and monitoring centers.

The Chinese patent titled Halogen-free, low-smoke, flame-retardant and fire-resistant control cable (publication number CN104112523A) discloses a halogen-free, low-smoke, flame-retardant and fire-resistant control cable, which is characterized in that the cable includes several insulated wire cores and a control wire core arranged in the center of the cable core, the insulated wire core is composed of a copper conductor and an insulating layer covered by the copper conductor, and the control wire core is composed of a copper conductor and a shielding layer covered by the conductor, The insulated wire core is extruded and wrapped around the tape to form a cable core, and the outside of the cable core is an inner sheath, a metal armor layer and an outer sheath in turn from the inside to the outside, and the inner sheath and the outer sheath are The sheath is polyvinyl chloride sheath. The halogen-free, low-smoke, flame-retardant and fire-resistant control cable adopts the non-environmental-friendly polyvinyl chloride (PVC) material stipulated by the state, and the halogen-free, low-smoke, flame-retardant and fire-resistant control cable cannot be moisture-proof, especially in places with heavy humidity in the south , easy to conduct electricity, rot, and easy to be bitten by insects. In addition, its resistance is not enough. When the cable is installed in the air, it is easy to break in a typhoon. If the cable is installed underground, it is easy to be crushed by passing vehicles.

Contents of the invention

In order to overcome the disadvantages mentioned above, the purpose of this utility model is to provide a control bus used in a photovoltaic power generation monitoring system that is environmentally friendly, flame-retardant, fire-resistant and strong in resistance.

The technical scheme that the utility model solves its technical problem is:

A control bus applied to a photovoltaic power generation monitoring system, which includes a wire core, a shielding body that wraps the wire core, and a sheath that wraps the shielding body, and the wire core is provided with: a conductor, a wrapping The inner skin layer of the conductor, the outer skin layer wrapping the inner skin layer; the inner skin layer is provided with a first polyolefin material body, and the outer skin layer is provided with a first polyolefin material body with a density higher than that in the inner skin layer The second polyolefin material body, an insulating layer with a flame-retardant filler inside is arranged between the inner skin layer and the outer skin layer; an aluminum foil layer with an aluminum foil inside is arranged in the shielding body; the sheath An outer sheath layer is arranged inside, and a ceramic polymer material body is arranged inside the outer sheath layer.

As an improvement of the present invention, the shielding body is further provided with a drain wire layer wrapping the aluminum foil layer, and at least one tinned copper conductor is arranged in the drain wire layer.

As a further improvement of the present utility model, a braided layer wrapping the drain wire layer is also arranged in the shielding body, and the braided layer is made of tinned copper mesh.

As a further improvement of the present utility model, a first inner sheath layer wrapped by the outer sheath layer is arranged inside the sheath, and a glass fiber cloth tape is arranged inside the first inner sheath layer.

As a further improvement of the present utility model, a second inner sheath layer wrapped by the first inner sheath layer is further arranged in the sheath, and a nylon material body is arranged in the second inner sheath layer.

As a further improvement of the present utility model, a conductor protection layer composed of fire-resistant mica tape is also arranged between the conductor and the inner skin layer.

As a further improvement of the utility model, a multi-twisted structure is formed between the tinned copper conductors in the drain line layer.

As a further improvement of the utility model, the number of said wire cores is one or more than one.

As a further improvement of the utility model, the cross-sectional shape of the control bus is circular, and the cross-sectional area of the control bus is 0.5-10mm ² .

One of the utility models is used in the control bus of the photovoltaic power generation monitoring system. The conductor is mainly used for transmission, and the first low-density polyolefin material body is arranged in the inner cortex to protect the conductor and ensure the characteristic impedance of the conductor. The stability of the outer skin layer is provided with a high-density second polyolefin material body, so that the structure of the conductor is stable, and a flame-retardant filler is provided in the insulating layer between the inner skin layer and the outer skin layer to give the inner skin layer and the outer skin layer. There is a buffer space, and it can also ensure that the transmission performance of the conductor is not damaged. The aluminum foil layer of the shielding body is equipped with aluminum foil, which is mainly used for moisture-proof, and can prevent water vapor, air, ultraviolet rays, bacteria, etc. from entering the core. The outer sheath layer of the jacket is provided with a ceramic polymer material body, which is mainly used for fire and heat insulation. When a fire occurs, the control bus catches fire, and the ceramic polymer material body of the outer sheath layer of the jacket is fired into a hard ceramic-like armor body. The higher the temperature, the longer the fired ceramic-like armor body. The residue is ceramic inorganic matter, and the residue is more than 85%. The ceramic-like armor body can form honeycomb-shaped micro-pores, which can play a very good fire and heat insulation effect. Function, when the temperature inside the core rises, the flame-retardant filler in the insulating layer expands, making the low-density first polyolefin material body in the inner skin layer expand to protect the conductor, and the high-density second polyolefin material body in the outer skin layer Also expands to prevent pressure from entering so that the conductor is not damaged. The utility model relates to a control bus used in a photovoltaic power generation monitoring system, which is environmentally friendly, flame-retardant, fire-resistant and strong in resistance.

Description of drawings

For ease of description, the utility model is described in detail by the following preferred embodiments and accompanying drawings.

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

Reference signs: 1-wire core, 11-conductor, 12-conductor protective layer, 13-inner skin layer, 14-insulation layer, 15-outer skin layer, 2-shielding body, 21-aluminum foil layer, 22-drain line layer , 23-braiding layer, 3-sheath, 31-first inner sheath layer, 32-first inner sheath layer, 33-outer sheath layer.           

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figure 1, a control bus of the utility model applied in a photovoltaic power generation monitoring system includes a wire core 1, a shield 2 wrapping the wire core 1 and a sheath 3 wrapping the shield 2, and the wire core 1 There are: a conductor 11, an inner skin layer 13 wrapping the conductor 11, and an outer skin layer 15 wrapping the inner skin layer 13; For the second polyolefin material body of the first polyolefin material body, an insulating layer 14 with a flame-retardant filler is also arranged between the inner skin layer 13 and the outer skin layer 15; an aluminum foil layer with an inner aluminum foil is arranged in the shielding body 2 21; an outer sheath layer 33 is arranged inside the sheath 3, and a ceramic polymer material body is arranged inside the outer sheath layer 33.

The utility model is a control bus used in a photovoltaic power generation monitoring system. The conductor 11 is mainly used for transmission. The inner cortex 13 is provided with a low-density first polyolefin material body, so as to protect the conductor 11 and also protect the conductor. 11 Stability of the characteristic impedance, a high-density second polyolefin material body is arranged in the outer skin layer 15, thereby making the structure of the conductor 11 stable, and a flame-retardant filling is arranged in the insulating layer 14 between the inner skin layer 13 and the outer skin layer 15 material, there is a buffer space for the inner skin layer 13 and the outer skin layer 15, and it can also ensure that the transmission performance of the conductor 1 is not damaged. The aluminum foil layer 21 of the shielding body 2 is provided with aluminum foil, which is mainly used for moisture-proof, and can prevent water vapor, air, ultraviolet rays, bacteria, etc. from entering the core 1 . The outer sheath layer 33 of the jacket 3 is provided with a ceramic polymer material body, which is mainly used for fire and heat insulation. When a fire broke out, the control bus was on fire, and the ceramic polymer material body of the outer sheath layer 33 of the outer jacket 3 was fired into a hard ceramic-like armor body. The higher the temperature, the longer the burnt ceramic-like armor body. , the residue is ceramic inorganic matter, and the residue is more than 85%. The ceramic armor can form honeycomb micropores, which can play a good fire and heat insulation effect. The aluminum foil layer 21 in the shield 2 forms the second protective layer. , to play the role of fire insulation, when the temperature inside the core 1 rises, the flame-retardant filler in the insulating layer 14 expands, making the low-density first polyolefin material body in the inner skin layer 13 expand, protecting the conductor 11, and the outer skin layer 15 The inner high-density body of the second polyolefin material also expands to prevent pressure from entering, so that the conductor 11 is not damaged.

In order to enhance the strength of the utility model, the shielding body 2 is also provided with a drain line layer 22 wrapped with an aluminum foil layer 21, and at least one tinned copper conductor is arranged in the drain line layer 22, and the tinned copper conductor surrounds the wire core 1 around to protect it from damage.

In order to make the utility model not affected by electromagnetic effects, a braided layer 23 wrapped around the drain line layer 22 is also arranged in the shielding body 2. The braided layer 23 is made of tinned copper mesh, which also enhances the control bus of the utility model. strength.

In order to further increase the flame-retardant effect of the present utility model, a first inner sheath layer 31 wrapped by an outer sheath layer 33 is also arranged in the sheath 3, and a glass fiber cloth tape is arranged in the first inner sheath layer 31. The fiber cloth tape is not flammable, so it can play a good role in flame retardancy and prevent the fire from further aggravating.

In order to increase the strength of the control bus of the present invention, so that the control bus is not easy to break or be flattened,

The second inner sheath layer 32 wrapped by the first inner sheath layer 31 is also arranged in the sheath 3, and a nylon material body is arranged in the second inner sheath layer 32, and the nylon material body can bear the pressure to avoid thread Core 1 is under pressure.

In order to further strengthen the fire caused by the conductor 1 from the inside to the outside (such as the situation in the short circuit), a conductor protection layer 12 composed of a refractory mica tape is also provided between the conductor 1 and the inner skin layer 13, and the conductor protection layer 12 protects the fire. Increase, thereby affecting the ignition of the entire control bus.

In order to improve the strength of the drain wire layer 22 , a double-twisted structure is formed between the tinned copper conductors in the drain wire layer.

In order to make the transmission capacity of the control bus of the utility model, the number of wire cores is one or more than one.

In order to make the installation and wiring of the control bus of the present utility model, the shape of the cross-section of the control bus is circular, and the cross-sectional area of the control bus is 0.5 ~ 10mm ² .

The utility model provides an embodiment, a control bus used in a photovoltaic power generation monitoring system, including a core 1, a shield 2 wrapping the core 1 and a sheath 3 wrapping the shield 2, the inner core 1 There are: a conductor 11, an inner skin layer 13 wrapping the conductor 11, and an outer skin layer 15 wrapping the inner skin layer 13; the conductor 11 can be made of 18AWG oxygen-free copper with a purity of 99.99%, which ensures the relevant physical properties, electrical properties and Transmission performance, and help to reduce low-frequency signal transmission attenuation. The inner skin layer 13 is provided with a first polyolefin material body, and the outer skin layer 15 is provided with a second polyolefin material body whose density is higher than that of the first polyolefin material body in the inner skin layer 13. There is also a gap between the inner skin layer 13 and the outer skin layer 15. An insulating layer 14 with a flame-retardant filler inside is provided; an aluminum foil layer 21 with an aluminum foil inside is arranged inside the shield 2; an outer sheath layer 33 is arranged inside the sheath 3, and a ceramic coating is arranged inside the outer sheath layer 33 Polymer material body. The inner skin layer 13 is provided with a low-density first polyolefin material body, the dielectric constant of the first polyolefin material body is small and stable, and the structure meets the requirement of cable characteristic impedance stability. The insulating layer 14 uses a nitrogen-filled physical foaming type, which is filled with nitrogen gas, with a foaming degree of 37% and a dielectric constant of 1.7. This structure is conducive to reducing the attenuation of high-frequency signal transmission. The outer skin layer 15 uses a high-density second The polyolefin material body is coated on the surface of the insulating layer 14 by means of equipment injection, so that its structure is more stable. A conductor protection layer 12 made of fire-resistant mica tape is also arranged between the conductor 1 and the inner skin layer 13, and the conductor protection layer 12 protects the fire from increasing, thereby affecting the ignition of the entire control bus. In the wire core 1, if there is a fire or a sudden increase in the external pressure, the nitrogen in the insulating layer 14 will expand due to the temperature rise or pressure increase, so that the inner skin layer 13 and the outer skin layer 14 will expand, thereby forming a physical foaming type, volume increase, forming a buffer, heat insulation or decompression, so as to avoid damage to the conductor 11. If it is internal because of the fire caused by conductor short circuit, etc., the refractory mica tape of the conductor protective layer 12 acts to insulate heat and fire, thereby not causing the external fire of the conductor 11 to increase and reducing the damage of the control bus.

The shielding body 2 in this embodiment is composed of an aluminum foil layer 21 , a drain wire layer 22 and a braided layer 23 . The aluminum foil layer 21 adopts a single-sided aluminum foil longitudinal wrapping structure, so that the aluminum foil layer 21 tightly wraps the wire core 1, which has good anti-interference effect and moisture resistance, and prevents water vapor, air, ultraviolet rays and bacteria from entering the wire core 1, and the drain wire layer 22 Multi-strand tinned copper conductors are used in a multi-twisted structure, which is easy to install and weld and is not prone to oxidation, which increases the structural strength of the shielding body 2. The braiding layer 23 is composed of tinned copper mesh with a density of 90%. This structure is comprehensive and effective The electromagnetic compatibility of the cable is improved, so that the core 1 is not affected by electromagnetic waves.

The sheath layer 3 in this embodiment includes a first inner sheath layer 31, a second inner sheath layer 32 and an outer sheath layer 33, and the outer sheath layer 33 is made of a ceramic polymer flame-retardant polyolefin material body. When the material burns at high temperature, it forms a hard armor-like body, which effectively protects the internal structure. The ceramic polymer flame-retardant polyolefin material quickly crusts to form a hard and dense outer layer, and the flame will not cause flame delay. 350°C to 1600°C with flame or no flame, no melting, no dripping, no falling off, no secondary disasters, can be fired into a hard ceramic-like armor body, the higher the temperature, the longer the fired ceramic-like armor The harder the armor body is, the residue is ceramic inorganic matter, and the residual amount is more than 85%. The ceramic armor body can form honeycomb micropores, which can play a good fire and heat insulation effect. The glass fiber cloth band of the first inner sheath layer 31 in the sheath 3 forms a fireproof belt, which can prevent the fire from spreading, and the nylon material body of the second inner sheath layer 32 forms an antibody protective layer. If there is a sudden increase in pressure, the nylon material The body can resist and prevent the core 1 from being under pressure.

The electrical performance of the control bus in this embodiment meets the technical requirements specified in Chapter 12.8.2 of the GB/T16657.2-2008 (Industrial Communication Network Fieldbus Specification), and the mechanical and physical properties of the sheath comply with CEEIA B218.1-2012 (Photovoltaic Power Generation General requirements for cables used in the system) Table 2 Performance index requirements. The flame retardancy of the product meets the requirements of GB/T20286-2008 (Certification Specification for Flame Retardant Products in Public Places), and the fire resistance meets the requirements of GB/T19216.23-2003 (Data Cable Combustion Integrity Test). The perfect combination of these features meets the effectiveness of the cable in the photovoltaic power generation monitoring bus control system.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (9)

1. A control bus applied to a photovoltaic power generation monitoring system, characterized in that it comprises a wire core, a shielding body wrapping the wire core and a sheath wrapping the shielding body, and the wire core is provided with: A conductor, an inner skin layer wrapping the conductor, and an outer skin layer wrapping the inner skin layer; a first polyolefin material body is arranged in the inner skin layer, and a first polyolefin material body having a density higher than that in the inner skin layer is arranged in the outer skin layer. For the second polyolefin material body of the polyolefin material body, an insulating layer with a flame-retardant filler is arranged between the inner skin layer and the outer skin layer; an aluminum foil layer with an aluminum foil inside is arranged in the shielding body; An outer sheath layer is arranged inside the sheath, and a ceramic polymer material body is arranged inside the outer sheath layer. 2. A control bus applied in a photovoltaic power generation monitoring system according to claim 1, wherein a drainage line layer wrapping the aluminum foil layer is also arranged in the shielding body, and the drainage line layer There is at least one tinned copper conductor disposed therein. 3. A control bus applied in a photovoltaic power generation monitoring system according to claim 2, wherein a braided layer wrapping the drain line layer is also arranged in the shielding body, and the braided layer is made of plated Made of tin copper mesh. 4. A control bus applied in a photovoltaic power generation monitoring system according to claim 3, wherein a first inner sheath layer wrapped by the outer sheath layer is also arranged in the sheath, A glass fiber cloth tape is arranged inside the first inner sheath layer. 5. A control bus applied in a photovoltaic power generation monitoring system according to claim 4, wherein a second inner sheath wrapped by the first inner sheath layer is also arranged in the sheath layer, and a nylon material body is arranged in the second inner sheath layer. 6 . The control bus used in a photovoltaic power generation monitoring system according to claim 5 , wherein a conductor protection layer composed of a refractory mica tape is further arranged between the conductor and the inner skin layer. 7 . 7 . The control bus used in a photovoltaic power generation monitoring system according to claim 6 , wherein a complex twisted structure is formed between tinned copper conductors in the drain line layer. 7 . 8 . The control bus used in a photovoltaic power generation monitoring system according to claim 7 , wherein the number of said wire cores is one or more than one. 9. A control bus applied in a photovoltaic power generation monitoring system according to claim 8, wherein the cross-sectional shape of the control bus is circular, and the cross-sectional area of the control bus is 0.5- 10mm ² .