Anti-interference safe photovoltaic cable

Abstract

The utility model relates to the technical field of cables, in particular to an anti-interference safe photovoltaic cable, which comprises a plurality of cable cores, a first shielding layer and a second shielding layer are arranged outside the cable cores, an inner protection layer and an outer protection layer are further arranged outside the cable cores, the inner protection layer is arranged between the first shielding layer and the second shielding layer, and the outer protection layer is arranged between the first shielding layer and the second shielding layer. The outer protection layer is arranged on the outer side of the second shielding layer; an annular groove is formed in the outer protection layer, a clamping guide plate is arranged at the annular groove, and the clamping guide plate is grounded; a first wrapping layer and a second wrapping layer are arranged between the inner protection layer and the outer protection layer, and the first wrapping layer and the second wrapping layer are distributed on the inner side and the outer side of the second shielding layer; according to the utility model, the first shielding layer and the second shielding layer are arranged for internal and external dual shielding, so that the cable has good shielding characteristics and can effectively isolate various electromagnetic interferences; the shielding layer is reliably grounded to form equipotential distribution, so that the anti-interference capability of the cable is enhanced; and the overall safety of the cable is high.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to an anti-interference safety photovoltaic cable. Background Technology

[0002] As a key link connecting various components in a photovoltaic power generation system and enabling stable power transmission and signal transmission, the performance of photovoltaic cables directly affects the operational stability and power generation efficiency of the entire system.

[0003] With the rapid development of modern industrial technology and smart grids, the electromagnetic environment of photovoltaic power generation systems is becoming increasingly complex. Various electrical devices, such as high-power frequency converters, high-frequency switching power supplies, and communication base stations, generate significant amounts of electromagnetic radiation during operation. This radiation exists in the form of electric, magnetic, or electromagnetic fields, forming complex sources of electromagnetic interference. In urban areas, electromagnetic interference is particularly severe due to the dense concentration of electrical equipment. For example, in photovoltaic power plants near substations or industrial plants, strong electromagnetic interference from surrounding electrical equipment can significantly affect the signals and power transmitted through photovoltaic cables, leading to signal distortion, increased bit error rates, and increased power loss during transmission. In large-scale photovoltaic power plants, even small power losses can accumulate and significantly impact power generation and economic benefits.

[0004] From the perspective of interference propagation paths, electromagnetic interference mainly affects photovoltaic cables through conduction and radiation. Conducted interference refers to electromagnetic interference propagating along the cable conductor or other metal components, directly entering the interior of the photovoltaic cable and interfering with its normal power and signal transmission. For example, harmonic currents in the power grid can be conducted into the photovoltaic cable through the grounding system or power lines, causing voltage fluctuations and current distortion. Radiated interference, on the other hand, induces interference voltage or current in the photovoltaic cable through the coupling effect of spatial electromagnetic fields. The impact of radiated interference is more pronounced when the photovoltaic cable is near strong radiation sources, such as communication base station antennas or high-voltage transmission lines. This interference not only reduces the power generation efficiency of the photovoltaic system but may also cause abnormal system control signals, affecting the safe and stable operation of the entire photovoltaic power station.

[0005] Existing photovoltaic cables have several limitations in terms of interference resistance. For example, while simple metal shielding layers can block some electromagnetic interference to a certain extent, their shielding effect is limited in complex and variable electromagnetic environments. On the one hand, as the frequency of electromagnetic interference continues to increase, the shielding effectiveness of traditional shielding materials gradually decreases, making them unable to effectively resist high-frequency electromagnetic interference. On the other hand, in practical applications, the cable shielding layer is easily affected by external forces, wear, and high temperatures, leading to a reduction in shielding performance and making it more susceptible to electromagnetic interference. Summary of the Invention

[0006] The purpose of this invention is to provide a safe photovoltaic cable with strong anti-interference performance.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] An anti-interference safety photovoltaic cable includes multiple cable cores. A first shielding layer and a second shielding layer are provided on the outer side of the multiple cable cores. An inner protective layer and an outer protective layer are also provided on the outer side of the cable cores. The inner protective layer is located between the first shielding layer and the second shielding layer, and the outer protective layer is located outside the second shielding layer. An annular groove is provided on the outer protective layer, and a clamping guide plate is provided at the annular groove. The clamping guide plate is grounded.

[0009] Furthermore, a first wrapping layer and a second wrapping layer are provided between the inner protective layer and the outer protective layer, and the first wrapping layer and the second wrapping layer are distributed on the inner and outer sides of the second shielding layer.

[0010] Furthermore, the first and second shielding layers are made of hot-dip galvanized steel wire or tin-plated copper wire, with the tin-plated copper wire woven and the hot-dip galvanized steel wire tightly wound; the first and second wrapping layers are made of mica tape or polyester tape.

[0011] Furthermore, the outer protective layer and the inner protective layer are made of polyvinyl chloride material; the outer surface of the outer protective layer is provided with a fire-retardant coating, which is an intumescent fire-retardant coating.

[0012] Furthermore, a limiting bracket is provided between the multiple cable cores, the limiting bracket has a central hole in the middle, and the edge of the limiting bracket has multiple arc-shaped grooves, which are evenly distributed around the circumference of the central hole.

[0013] Furthermore, the number of arc-shaped grooves is equal to the number of cable cores, and the central angle of the arc-shaped grooves is ≥180°, while the cable cores are arranged through the arc-shaped grooves.

[0014] Furthermore, the space formed by the first shielding layer, the cable core, and the limiting bracket is filled with a flame-retardant layer made of inorganic flame-retardant fibers.

[0015] Furthermore, the bottom of the annular groove is a second shielding layer, and two symmetrical clamping guides are provided. The two clamping guides are connected by bolts and sleeved in the annular groove, and are in contact with the second shielding layer.

[0016] Furthermore, an annular groove is provided on the outer side of the outer protective layer near the annular groove, a stepped groove is provided on the edge of the clamping guide plate, an arc-shaped retaining ring is provided in the stepped groove, the outer protective layer extends into the stepped groove, and the arc-shaped retaining ring is located in the annular groove.

[0017] Furthermore, the clamping guide plate has a first clamping plate and a second clamping plate arranged on its upper and lower sides. A bolt threaded through the first clamping plate is arranged through the second clamping plate. A limiting rod fixedly installed on the second clamping plate is arranged through the limiting hole of the first clamping plate. A boss and a slot are provided at the end of the second clamping plate. The part of the purlin extending into the first clamping plate and the second plate is fitted with the boss, and the edge of the purlin is inserted into the slot.

[0018] The beneficial effects of adopting the technical solution of this utility model are:

[0019] 1. This utility model features double shielding with a first shielding layer and a second shielding layer, giving the cable excellent shielding performance and effectively isolating various electromagnetic interferences.

[0020] 2. This utility model is provided with an annular groove, and the bottom of the annular groove is connected to the second shielding layer. At the same time, a clamping guide plate is provided at the annular groove. The clamping guide plate and the grounding end can be connected by cable to make the shielding layer reliably grounded, forming an equipotential distribution and enhancing the anti-interference ability of the cable.

[0021] 3. This utility model is equipped with a limiting bracket, which allows multiple cable cores to be placed stably at intervals under the action of the limiting bracket. A flame-retardant layer is filled in the space composed of the limiting bracket, the shielding layer, and the cable, so that the cable has good flame-retardant and heat insulation properties. It can effectively prevent the spread of fire caused by short circuits between cable cores and improve the overall safety of the cable. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the cable of this utility model. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of the card holder in this utility model;

[0025] Figure 3 This is a schematic diagram of the cable and clamping guide plate of this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the cable of this utility model. Figure 2 ;

[0027] Figure 5 This is a schematic diagram of the clamping guide plate in this utility model;

[0028] Figure 6 This is a schematic diagram of the connection between the cable and the purlin of this utility model;

[0029] Figure 7 This is a schematic diagram of the structure of the first and second clamping plates in this utility model. Figure 1 ;

[0030] Figure 8 This is a schematic diagram of the structure of the first and second clamping plates in this utility model. Figure 2 .

[0031] In the diagram: 1. Cable core; 2. Flame retardant layer; 3. Restriction bracket; 31. Center hole; 32. Arc groove; 4. First shielding layer; 5. Inner protective layer; 6. First wrapping layer; 7. Second shielding layer; 8. Second wrapping layer; 9. Outer protective layer; 10. Clamping guide plate; 11. Annular slot; 12. Stepped groove; 13. Arc-shaped retaining ring; 14. Guide post; 15. First clamping plate; 16. Second clamping plate; 17. Purlin; 18. Restriction rod; 19. Slot; 20. Boss; 21. Restriction hole. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention and should not limit the scope of protection of the present invention.

[0033] Example 1:

[0034] like Figure 1 As shown, to improve the anti-interference capability of photovoltaic cables, this embodiment provides a new cable suitable for photovoltaic systems. The cable includes a cable core 1, a first shielding layer 4, a second shielding layer 7, an inner protective layer 5, and an outer protective layer 9. Multiple cable cores 1 are provided, arranged in parallel. The first shielding layer 4, inner protective layer 5, second shielding layer 7, and outer protective layer 9 are sequentially arranged from the inside to the outside of the cable core 1. The combined effect of the first shielding layer 4 and the second shielding layer 7 effectively isolates electromagnetic interference, enhances anti-interference capability, and reduces the impact of external electromagnetic interference on the transmission of signals and electrical energy by the cable core. The combined effect of the inner protective layer 5 and the outer protective layer 9 enhances the cable's resistance to external impacts, abrasion, and corrosion from ultraviolet rays and chemicals, protecting the internal structure of the cable from damage.

[0035] like Figure 1 As shown, in order to achieve basic power transmission and signal transmission capabilities, the cable core 1 includes a conductor and an insulation layer wrapped around the outside of the conductor. The insulation layer can be made of cross-linked polyethylene, ethylene propylene rubber, polytetrafluoroethylene, etc.

[0036] The outer protective layer 9 and the inner protective layer 5 are made of polyvinyl chloride, which has good mechanical properties and weather resistance. They can effectively resist external impact, abrasion, and corrosion from ultraviolet rays and chemicals, protecting the internal structure of the cable from damage.

[0037] The first shielding layer 4 and the second shielding layer 7 can both be made of hot-dip galvanized steel wire or tin-plated copper wire, or they can be made of hot-dip galvanized steel wire or tin-plated copper wire respectively. For example, the second shielding layer 7 can be made of hot-dip galvanized steel wire, and the first shielding layer 4 can be a tin-plated copper wire braided layer. The tin-plated copper wire braiding and the tightly wound hot-dip galvanized steel wire have good shielding characteristics and can effectively isolate various electromagnetic interferences, shielding the influence of external electromagnetic interference on the signal and power transmission of the cable core.

[0038] like Figure 1 As shown, to ensure the stable installation of the second shielding layer 7, a first wrapping layer 6 and a second wrapping layer 8 are provided between the inner protective layer 5 and the outer protective layer 9. The first wrapping layer 6 and the second wrapping layer 8 are distributed on the inner and outer sides of the second shielding layer 7, enabling the second shielding layer 7 to be wound more tightly and neatly together, preventing it from loosening, protecting the inner protective layer 5 and the outer protective layer 9 from damage, and acting as a buffer and pad. The first wrapping layer 6 and the second wrapping layer 8 can be made of mica tape or polyester tape.

[0039] like Figure 3 , Figure 4 As shown, to further improve the cable's anti-shielding capability, an annular groove can be provided on the outer protective layer 9. The bottom of the annular groove is the second shielding layer 7, and two clamping guide plates 10 are symmetrically arranged at the annular groove. The two clamping guide plates 10 are connected by bolts and sleeved in the annular groove, contacting the second shielding layer 7. In addition, guide posts 14 are provided on the outside of the clamping guide plates 10. The guide posts 14 can be connected to cables in contact with the ground, reliably grounding the shielding layer and forming an equipotential distribution. For long-distance cables or high-frequency interference environments, multiple grounding points may be required.

[0040] like Figure 4 , Figure 5 As shown, in order to stably connect the clamping guide plate 10 with the outer protective layer 9 and enhance the strength of the outer protective layer 9, an annular groove 11 is provided on the outer side of the outer protective layer 9 near the annular groove, and a stepped groove 12 is provided on the edge of the clamping guide plate 10. An arc-shaped retaining ring 13 is provided at the stepped groove 12. When connected, the outer protective layer 9 extends into the stepped groove 12, and the arc-shaped retaining ring 13 is located in the annular groove 11. Therefore, when the clamping guide plate 10 is fastened to fit the cable, its edge presses against the outer protective layer 9, so that the two ends of the outer protective layer 9 are relatively stable, thereby restricting the relative movement of the outer protective layer 9.

[0041] Example 2:

[0042] like Figure 1 , Figure 2 As shown, based on Embodiment 1, to enhance the fire resistance of the cable, a limiting bracket 3 is provided between multiple cable cores 1. The limiting bracket 3 has a central hole 31 in its center, and multiple arc-shaped grooves 32 are provided along its edge, evenly distributed around the circumference of the central hole 31. The number of arc-shaped grooves 32 is equal to the number of cable cores 1, and the central angle of each arc-shaped groove 32 is ≥180°, providing a sufficiently large opening. The cable cores 1 pass through the arc-shaped grooves 32. Therefore, under the action of the limiting bracket 3, the multiple cable cores 1 are controlled to be placed relatively stably, while gaps are left between adjacent cable cores 1, facilitating the filling of flame-retardant material into these gaps.

[0043] Specifically, a flame-retardant layer 2 is filled in the space formed by the first shielding layer 4, the cable core 1, and the limiting bracket 3. The flame-retardant layer 2 is made of inorganic flame-retardant fibers, such as glass fiber and ceramic fiber, which have good flame-retardant and heat insulation properties. It can effectively prevent the spread of fire caused by short circuits between cable cores and improve the overall safety of the cable.

[0044] In addition, a fireproof coating can be provided on the outer surface of the outer protective layer 9. The fireproof coating is an intumescent fireproof coating. When the cable encounters high temperature or fire, the fireproof coating can expand rapidly to form a heat-insulating and fireproof protective layer, preventing the spread of fire and improving the fire safety of the cable.

[0045] Example 3:

[0046] like Figure 6 , Figure 7 , Figure 8 As shown, based on Embodiment 1 or 2, when a clamping guide plate 10 is provided, a connecting mechanism can be provided at the end of the clamping guide plate 10 to allow the cable to be laid on the purlin 17 of the photovoltaic system bracket, achieving stable cable installation. Specifically, the connecting mechanism includes a first clamping plate 15 and a second clamping plate 16 arranged vertically. The end of the first clamping plate 15 is connected to the end of the clamping guide plate 10 by bolts, and the bolt thread that passes through the first clamping plate 15 passes through the second clamping plate 16. At the same time, the limiting rod 18 fixedly installed on the second clamping plate 16 passes through the limiting hole 21 of the first clamping plate 15. Therefore, by rotating the bolts, the relative position distance between the first clamping plate 15 and the second clamping plate 16 can be adjusted, thereby controlling the clamping and installation of the first clamping plate 15 and the second clamping plate 16 on the purlin 17.

[0047] To ensure a stable connection between the purlin 17 and the clamping plate, a boss 20 and a slot 19 are provided at the end of the second clamping plate 16. The slot 19 is located adjacent to the boss 20. Therefore, when the first clamping plate 15 and the second clamping plate 16 are distributed on both sides of the purlin 17, the portion of the purlin 17 extending into the first clamping plate 15 and the second clamping plate 16 is fitted against the boss 20, and the edge of the purlin 17 is inserted into the slot 19, thus allowing the clamping plate to be stably installed on the purlin 17.

[0048] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. It should be noted that for those skilled in the art, any changes, modifications or additions made without departing from the concept of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. An anti-interference type safety photovoltaic cable, characterized in that: The cable includes multiple cable cores (1), with a first shielding layer (4) and a second shielding layer (7) disposed on the outside of the multiple cable cores (1), and an inner protective layer (5) and an outer protective layer (9) disposed on the outside of the cable cores (1). The inner protective layer (5) is disposed between the first shielding layer (4) and the second shielding layer (7), and the outer protective layer (9) is disposed on the outside of the second shielding layer (7). An annular groove is disposed on the outer protective layer (9), and a clamping guide plate (10) is disposed at the annular groove. The clamping guide plate (10) is grounded.

2. The anti-interference safety photovoltaic cable according to claim 1, characterized in that: A first wrapping layer (6) and a second wrapping layer (8) are provided between the inner protective layer (5) and the outer protective layer (9). The first wrapping layer (6) and the second wrapping layer (8) are distributed on the inner and outer sides of the second shielding layer (7).

3. The anti-interference safety photovoltaic cable according to claim 2, characterized in that: The first shielding layer (4) and the second shielding layer (7) are made of hot-dip galvanized steel wire or tin-plated copper wire, with the tin-plated copper wire woven and the hot-dip galvanized steel wire tightly wound; the first wrapping layer (6) and the second wrapping layer (8) are made of mica tape or polyester tape.

4. The anti-interference safety photovoltaic cable according to claim 1, characterized in that: The outer protective layer (9) and the inner protective layer (5) are made of polyvinyl chloride material; the outer surface of the outer protective layer (9) is provided with a fireproof coating, which is an intumescent fireproof coating.

5. The anti-interference safety photovoltaic cable according to claim 1, characterized in that: A limiting bracket (3) is provided between multiple cable cores (1). A central hole (31) is provided in the middle of the limiting bracket (3), and multiple arc-shaped grooves (32) are provided on the edge of the limiting bracket (3). The arc-shaped grooves (32) are evenly distributed around the circumference of the central hole (31).

6. The anti-interference safety photovoltaic cable according to claim 5, characterized in that: The number of arc-shaped grooves (32) is equal to the number of cable cores (1), and the central angle of the arc-shaped grooves (32) is ≥180°. At the same time, the cable cores (1) are arranged through the arc-shaped grooves (32).

7. The anti-interference safety photovoltaic cable according to claim 6, characterized in that: A flame-retardant layer (2) is filled in the space formed by the first shielding layer (4), the cable core (1) and the limiting bracket (3), and the flame-retardant layer (2) is made of inorganic flame-retardant fibers.

8. The anti-interference safety photovoltaic cable according to claim 1, characterized in that: The bottom of the annular groove is the second shielding layer (7), and the clamping guide plate (10) is provided with two symmetrical ones. The two clamping guide plates (10) are connected by bolts and sleeved in the annular groove, and the clamping guide plate (10) is in contact with the second shielding layer (7).

9. The anti-interference safety photovoltaic cable according to claim 8, characterized in that: An annular groove (11) is provided on the outer side of the outer protective layer (9) near the annular groove. A stepped groove (12) is provided on the edge of the clamping guide plate (10). An arc-shaped retaining ring (13) is provided at the stepped groove (12). The outer protective layer (9) extends into the stepped groove (12), and the arc-shaped retaining ring (13) is located in the annular groove (11).

10. The anti-interference safety photovoltaic cable according to claim 8, characterized in that: The clamping guide plate (10) has a first clamping plate (15) and a second clamping plate (16) arranged on its upper and lower sides. A bolt threaded through the first clamping plate (15) is threaded through the second clamping plate (16). A limiting rod (18) fixedly installed on the second clamping plate (16) is threaded through the limiting hole (21) of the first clamping plate (15). A boss (20) and a slot (19) are provided at the end of the second clamping plate (16). A purlin (17) extends into the first clamping plate (15) and the second plate and fits against the boss (20). The edge of the purlin (17) is inserted into the slot (19).

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