Photovoltaic power station grid-connected cable protection device

Abstract

The invention discloses a photovoltaic power station grid-connected cable protection device, and relates to the technical field of photovoltaic power generation. The photovoltaic power station grid-connected cable protection device comprises a mounting rack connected with an inverter, and the mounting rack is provided with a holding assembly for limiting the bending degree of a cable and a fastening assembly for fixing a cable joint; the holding assembly comprises a holding frame, one end of the holding frame is hinged to the mounting frame, the other end of the holding frame is provided with a clamping plate for fixing a cable, the fastening assembly comprises a first connecting pipe and a second connecting pipe which are connected with the inverter, the cable penetrates through the first connecting pipe and the second connecting pipe and then is connected with the inverter, and the second connecting pipe is provided with a first through hole; a fastening rod is arranged in the first through hole, the second connecting pipe is in threaded connection with a driving pipe, and the driving pipe pushes the arc-shaped end to enable the inner end of the fastening rod to abut against the cable. According to the photovoltaic power station grid-connected cable protection device, the cable is wrapped and clamped through the holding assembly, and the connection between the direct current cable and the inverter is firmer and more stable through the fastening assembly.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic power generation, and in particular to a photovoltaic power station grid-connected cable protection device. Background Art

[0002] In recent years, with the continuous improvement of global awareness of clean energy and environmental protection, household photovoltaic power generation has developed rapidly. Governments of various countries have introduced relevant policies to encourage households to install solar photovoltaic panels to reduce dependence on traditional energy and reduce carbon emissions. Household photovoltaic power generation systems are generally composed of solar panels, solar charge and discharge controllers, battery packs, inverters, DC cables and other related electrical connections and installation components. Among them, solar panels are responsible for converting solar energy into DC power; solar charge and discharge controllers are used to control the charge and discharge process of batteries to protect batteries from damage caused by overcharging or over-discharging; battery packs are used to store electrical energy for power supply at night or when there is insufficient light; inverters convert DC power into AC power to meet household electricity needs.

[0003] In the related art, a DC cable transmits the electric energy generated by a solar panel to an inverter. Since solar panels are usually installed on the roof, the DC cable needs to be bent when connected to the inverter. When the bending degree is large, the DC cable will generate a large restoring force at the bend. Long-term use may easily cause the connector at one end of the DC cable to detach from the inverter. Moreover, the inverter is usually installed outdoors, and the DC cable may also detach from the inverter if it is exposed to wind shaking for a long time.

[0004] Therefore, the prior art needs to be improved. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the connection between the cable and the inverter in the prior art is unstable. The purpose is to provide a photovoltaic power station grid-connected cable protection device, which adopts the corresponding technical solution and has the beneficial effects of making the cable connection stable, not easy to loosen, and having a longer service life.

[0006] The present invention is achieved through the following technical solutions: The present invention provides a photovoltaic power station grid-connected cable protection device, which includes a mounting frame connected to an inverter, the mounting frame being provided with a retaining component for limiting the bending degree of the cable and a fastening component for fixing the cable joint; The holding assembly includes a holding frame, one end of which is hinged to the mounting frame, and the other end of which is provided with a clamping plate for fixing the cable. The fastening assembly includes a first connecting tube and a second connecting tube connected to the inverter. The cable is connected to the inverter after passing through the first connecting tube and the second connecting tube. The second connecting tube is provided with a first through hole. A fastening rod is provided in the first through hole. The outer end of the fastening rod is configured as an arc-shaped end. The second connecting tube is threadedly connected with a driving tube. The driving tube pushes the arc-shaped end to make the inner end of the fastening rod press against the cable.

[0007] Furthermore, in the present invention, an I-shaped plate is provided at the other end of the retaining frame, connecting shafts are provided on both sides of the I-shaped plate, the connecting shafts are rotatably connected to the clamping plate, and the connecting shafts are provided with torsion springs connected to the clamping plate.

[0008] Furthermore, in the present invention, the height of one end of the retaining frame from the ground is higher than the height of the other end of the retaining frame from the ground.

[0009] Furthermore, in the present invention, the cable sleeve is provided with a support plate and a second spring, a third step portion is provided in the second connecting tube, one end of the second spring acts on the support plate, and the other end of the second spring acts on the third step portion.

[0010] Furthermore, in the present invention, the above-mentioned first connecting tube is provided with a second through hole, an indicator rod is provided in the second through hole, a trigger member is provided at the bottom of the support plate, a first inclined surface is provided on the side of the trigger member close to the indicator rod, a second inclined surface is provided on the side of the indicator rod close to the trigger member, and the first inclined surface is parallel to the second inclined surface.

[0011] Furthermore, in the present invention, the plurality of indicator rods are evenly distributed around the axis of the first connecting tube, and the triggering member is configured as a cylinder.

[0012] Furthermore, in the present invention, one end of the driving tube facing the tightening rod is configured as an inclined surface connected to the arc-shaped end.

[0013] Furthermore, in the present invention, the first through hole is provided with a first step portion, the fastening rod is provided with a second step portion, the fastening rod sleeve is provided with a first spring, and two ends of the first spring act on the first step portion and the second step portion respectively.

[0014] Furthermore, in the present invention, the number of the fastening rods is at least three, and the fastening rods are evenly distributed around the second connecting pipe.

[0015] Furthermore, in the present invention, the mounting frame is provided with a guide frame connected to the cable.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The photovoltaic power station grid-connected cable protection device of the present invention is provided with a retaining component on the mounting frame, and a retaining frame and a clamping plate for wrapping and clamping the DC cable are provided on the retaining component, so that the bending degree of the DC cable can be maintained and the restoring force generated by the bending can be reduced, thereby reducing the situation where the DC cable is separated from the inverter. In addition, by driving a plurality of fastening rods to clamp the DC cable through a driving tube, the connection between the DC cable and the inverter can be further strengthened, thereby making the connection between the DC cable and the inverter more reliable and stable, and extending the service life.

[0017] 2. The photovoltaic power station grid-connected cable protection device of the present invention is provided with a support plate and a trigger member on the DC cable. When the DC cable is separated from the inverter, the trigger member can be used to squeeze one end of the indicator rod to the outside of the first connecting tube. In this way, it can be judged whether the DC cable is separated from the inverter by observing the position of the indicator rod, which is more intuitive and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings: Figure 1 It is a schematic diagram of a photovoltaic power station grid-connected cable protection device of the present invention; Figure 2 is a schematic diagram of a retaining assembly of the present invention; Figure 3 for Figure 1 The enlarged schematic diagram of point A in the middle; Figure 4 is a cross-sectional schematic diagram of the fastening assembly of the present invention; Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle; Figure 6 for Figure 4 Enlarged schematic diagram of point C in the middle.

[0019] Markings and corresponding component names in the accompanying drawings: 1-inverter, 2-mounting frame, 21-guide frame, 3-cable, 4-holding assembly, 41-holding frame, 411-I-shaped plate, 412-connecting shaft, 413-torsion spring, 42-clamp, 5-fastening assembly, 51-first connecting tube, 511-second through hole, 52-second connecting tube, 521-first through hole, 5211-first step portion, 522-third step portion, 53-fastening rod, 531-arc end, 532-second step portion, 54-driving tube, 541-inclined surface, 55-first spring, 6-support plate, 7-second spring, 8-trigger, 81-first inclined surface, 9-indicator rod, 91-second inclined surface. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments and drawings. The schematic implementation mode of the present invention and its description are only used to explain the present invention and are not intended to limit the present invention. The following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0022] Example: Combination Figure 1-Figure 6 As shown, a photovoltaic power station grid-connected cable protection device is provided in an embodiment of the present invention, and the specific structure is described as follows.

[0023] Combination Figure 1 As shown, the photovoltaic power station grid-connected cable protection device includes four retaining components 4 and four fastening components 5, which are used to fix a photovoltaic inverter 1 and four cables 3. The inverter 1 is a prior art, and the internal structure and principle do not need to be specifically shown in this application.

[0024] Further, combined with Figure 1As shown, the mounting frame 2 mainly plays the role of installation and support. The mounting frame 2 is used to install the inverter 1 and can provide an installation position for the retaining component 4 and the fastening component 5. When in use, the inverter 1 can be fixedly connected to the mounting frame 2. The mounting frame 2 is provided with a connection hole, and then the mounting frame 2 can be fixedly connected to a wall or other carrier through the connection hole by bolts, so as to facilitate the installation of the inverter 1.

[0025] In this embodiment, since four DC cables 3 are provided, four retaining components 4 are also provided. Figure 1 As shown, the DC cable 3 corresponds to the retaining assembly 4. The retaining assembly 4 is mainly used to limit the bending degree of the corresponding DC cable 3, so that the bending degree of the DC cable 3 during installation can be reduced, thereby reducing the restoring force generated by the bending of the DC cable 3, and further making the connection between the DC cable 3 and the inverter 1 more stable.

[0026] Further, combined with Figure 1 and Figure 2 As shown, the retaining assembly 4 mainly includes two parts: a retaining frame 41 and a clamping plate 42. The retaining frame 41 adopts a long metal rod, and the inner end of the retaining frame 41 is hinged to the mounting frame 2. Specifically, a hinge support is installed on the surface of the mounting frame 2, and the inner end of the retaining frame 41 is connected to the hinge support, so that the retaining frame 41 can rotate around the mounting frame 2. An I-shaped plate 411 is fixedly installed at the outer end of the retaining frame 41, and the shape of the I-shaped plate 411 is an I-shaped. A connecting shaft 412 is installed on each side of the I-shaped plate 411, and the connecting shaft 412 passes through the clamping plate 42, and the clamping plate 42 can rotate around the connecting shaft 412. In addition, a torsion spring 413 is installed on the connecting shaft 412, and the torsion spring 413 and the clamping plate 42 are also connected. The arc-shaped clamping plate 42 mainly plays the role of wrapping and clamping the cable 3.

[0027] It should be noted that in the initial state where the torsion spring 413 is not deformed, the free ends of the two side clamps 42 are in contact with each other. When in use, after the connector of the cable 3 is connected to the inverter 1, the free ends of the two clamps 42 in the corresponding retaining assembly 4 are broken apart, and the torsion spring 413 is deformed at this time, and then the corresponding cable 3 is placed between the two clamps 42, and then the clamps 42 on both sides are released. The free ends of the clamps 42 on both sides will contact again under the action of the restoring force of the torsion spring 413, so that the cable 3 can be wrapped, and then the DC cable 3 can be kept at a safe bending degree, which is beneficial to protect the DC cable 3. The bending degree of the DC cable 3 can be set according to the actual working conditions by setting the length and inclination of the retaining frame 41.

[0028] Combination Figure 1 and Figure 2As shown, the retaining frame 41 is arranged to be inclined downward, that is, the height of the inner end of the retaining frame 41 (the end connected to the mounting frame 2) from the ground is higher than the height of the outer end of the retaining frame 41 (the end connected to the clamping plate 42) from the ground, so that the retaining assembly 4 can be arranged close to the bending part of the DC cable 3, so as to better maintain the bending degree of the DC cable 3.

[0029] In this embodiment, combined with Figure 1 The interface of the inverter 1 is arranged at the bottom of the inverter 1, and the top connector of the DC cable 3 is inserted into the interface to realize electrical connection with the inverter 1. Figure 3 and Figure 4 As shown, the fastening assembly 5 includes a first connecting pipe 51 and a second connecting pipe 52 arranged at the interface of the inverter 1, the second connecting pipe 52 is sleeved on the outside of the first connecting pipe 51, and the first connecting pipe 51 and the second connecting pipe 52 are threadedly connected.

[0030] Combination Figure 4 and Figure 6 As shown, the second connecting tube 52 has a plurality of first through holes 521 (four in this embodiment) in an axial ring array, the first through holes 521 extend along its radial direction, a slidable fastening rod 53 is arranged in the first through holes 521, and a driving tube 54 is threadedly connected to the outer wall of the second connecting tube 52, and the driving tube 54 can push the fastening rod 53 to move toward the inside of the second connecting tube 52 to clamp the DC cable 3.

[0031] In the initial state, if Figure 6 As shown, one end of the fastening rod 53 away from the axis of the second connecting tube 52 extends to the outside of the first through hole 521, so that the driving tube 54 is squeezed and matched with the outer end of the fastening rod 53, and the end of the fastening rod 53 close to the axis of the second connecting tube 52 is located inside the first through hole 521, so that the interference of the fastening rod 53 on the installation process of the DC cable 3 can be reduced.

[0032] Combination Figure 6 As shown, since the outer end of the fastening rod 53 is an arcuate end 531, and the arcuate end 531 is hemispherical, by setting the end of the fastening rod 53 close to the driving tube 54 as the hemispherical arcuate end 531, when the driving tube 54 contacts and squeezes the arcuate end 531 of the fastening rod 53, the friction between the driving tube 54 and the fastening rod 53 can be reduced, so that the fastening rod 53 is easier to be squeezed and moved, which can save labor and extend the service life of the fastening rod 53 and the driving tube 54.

[0033] And if Figure 6As shown, the end of the driving tube 54 facing the fastening rod 53 is provided with an inclined surface 541, the distance between the end of the inclined surface 541 close to the fastening rod 53 and the axis of the second connecting tube 52 is greater than the distance between the end of the inclined surface 541 away from the fastening rod 53 and the axis of the second connecting tube 52, and the cross section of the inclined surface 541 is high outside and low inside. The inclined surface 541 mainly plays a transition guide role. In the process of contact and extrusion between the driving tube 54 and the fastening rod 53, the inclined surface 541 can be used to gradually extrude the fastening rod 53, so that the friction between the driving tube 54 and the fastening rod 53 can be further reduced.

[0034] When in use, the driving tube 54 pushes the fastening rod 53 to move inside the second connecting tube 52, and the inner end of the fastening rod 53 clamps the DC cable 3. Specifically, since the driving tube 54 is threadedly connected to the outer wall of the second connecting tube 52, the driving tube 54 is rotated, and the driving tube 54 can move upward along the axis of the second connecting tube 52. When the driving tube 54 moves to contact the fastening rod 53, the driving tube 54 will apply a radially inward pressure along the second connecting tube 52 to the fastening rod 53, so that the fastening rod 53 will move toward the inside of the second connecting tube 52, thereby clamping the DC cable 3, so that the connection between the DC cable 3 and the inverter 1 can be more stable.

[0035] In this embodiment, if Figure 6 As shown, in the axial direction of the second connecting tube 52, the cross-sectional shapes of the first through hole 521 and the fastening rod 53 are both approximately T-shaped, so the first through hole 521 is provided with a first step portion 5211, the fastening rod 53 is provided with a second step portion 532, and a first spring 55 is provided between the first step portion 5211 and the second step portion 532. The first spring 55 is sleeved on the fastening rod 53, and the two ends of the first spring 55 are respectively fixedly connected to the first step portion 5211 and the second step portion 532, and the first spring 55 mainly plays the role of providing a restoring force.

[0036] It should be noted that the first through hole 521 and the end with a smaller diameter of the fastening rod 53 are both arranged close to the axis of the second connecting tube 52. When in use, when the fastening rod 53 moves toward the inside of the second connecting tube 52 to clamp the DC cable 3 under the extrusion force of the driving tube 54, the second step portion 532 will move toward the first step portion 5211, and the first spring 55 will be squeezed. When the DC cable 3 needs to be disconnected from the inverter 1, the driving tube 54 is rotated in the reverse direction, and the driving tube 54 will gradually disconnect from the fastening rod 53. The fastening rod 53 will return to its original position under the restoring force of the first spring 55, so that the fastening rod 53 can release the clamping of the DC cable 3.

[0037] As an optional embodiment, the number of the first through holes 521 and the fastening rods 53 is at least three, preferably four in this embodiment, and evenly distributed around the second connecting tube 52. That is, the number of the first through holes 521 and the fastening rods 53 are both four, so that the DC cable 3 can be clamped from multiple directions, making the arrangement of the DC cable 3 more reliable and stable.

[0038] In this embodiment, combined with Figure 4 As shown, a third step portion 522 is provided in the second connecting pipe 52, and a support plate 6 is sleeved at the position of the DC cable 3 located in the interface of the inverter 1, and the support plate 6 and the cable 3 are fixedly connected. A second spring 7 is provided between the support plate 6 and the third step portion 522, and the second spring 7 is sleeved on the cable 3. The second spring 7 mainly plays the role of providing a supporting force. When the connection between the connector of the DC cable 3 and the inverter 1 is loose, the second spring 7 can provide a supporting force to the DC cable 3 through the support plate 6, thereby reducing the situation where the DC cable 3 is separated from the inverter 1.

[0039] Further, such as Figure 4 and Figure 5 As shown, the first connecting tube 51 is provided with a second through hole 511 along its radial direction, and an indicator rod 9 is installed in the second through hole 511, and the indicator rod 9 can slide horizontally in the second through hole 511. A trigger member 8 is provided on the side of the support plate 6 facing the indicator rod 9, and the trigger member 8 can push the indicator rod 9 out of the first connecting tube 51 after it descends.

[0040] The trigger member 8 may be of a cylindrical structure, which can ensure that the trigger member 8 can contact the indicator rod 9 during the descending process.

[0041] Furthermore, if Figure 5 As shown, the trigger member 8 is provided with a first inclined surface 81 on one side close to the indicator rod 9, and the indicator rod 9 is provided with a second inclined surface 91 on one side close to the trigger member 8, and the first inclined surface 81 is parallel to the second inclined surface 91. The first inclined surface 81 and the second inclined surface 91 can both play a role of transition guide. During the falling process of the trigger member 8, the first inclined surface 81 will contact the second inclined surface 91, so that the trigger member 8 will gradually press the indicator rod 9 toward the outside of the first connecting tube 51, which can reduce the friction between the trigger member 8 and the indicator rod 9, making the contact between the trigger member 8 and the indicator rod 9 smoother.

[0042] Combination Figure 5As shown, in the initial state, the end of the indicator rod 9 close to the trigger member 8 is located in the first connecting tube 51 and is arranged below the trigger member 8, so that the trigger member 8 can contact the indicator rod 9 when it falls. The end of the indicator rod 9 away from the trigger member 8 is located inside the second through hole 511. When in use, when the connector of the DC cable 3 is disconnected from the inverter 1, the DC cable 3 will move downward under the action of gravity. At this time, the support plate 6 will compress the second spring 7 and drive the trigger member 8 to move downward under the drive of the DC cable 3. When the trigger member 8 contacts and squeezes the indicator rod 9, the indicator rod 9 will move to the outside of the first connecting tube 51, so that the user can judge whether the connector of the DC cable 3 is disconnected from the inverter 1 by observing the position of the indicator rod 9, which is more intuitive and convenient to use.

[0043] In this embodiment, if Figure 1 As shown, the guide frame 21 is fixedly connected to the mounting frame 2, and the guide frame 21 is arranged above the first connecting pipe 51. A plurality of guide holes are opened on the guide frame 21, and the plurality of guide holes correspond to the plurality of DC cables 3 one by one, and the DC cables 3 are passed through the corresponding guide holes. Among them, the guide frame 21 mainly plays the role of guiding and supporting. By passing the DC cables 3 through the corresponding guide holes, the guide frame 21 can be used to limit and guide the DC cables 3, so that the state of the DC cables 3 can be better maintained.

[0044] In summary, the present invention provides a photovoltaic power station grid-connected cable protection device, which includes a mounting frame 2 connected to an inverter 1, the mounting frame 2 is provided with a retaining component 4 for limiting the bending degree of the cable 3 and a fastening component 5 for fixing the joint of the cable 3; the retaining component 4 includes a retaining frame 41, one end of the retaining frame 41 is hinged to the mounting frame 2, and the other end of the retaining frame 41 is provided with a clamping plate 42 for fixing the cable 3, the fastening component 5 includes a first connecting tube 51 and a second connecting tube 52 connected to the inverter 1, the cable 3 is connected to the inverter 1 after passing through the first connecting tube 51 and the second connecting tube 52, the second connecting tube 52 is provided with a first through hole 521, a fastening rod 53 is provided in the first through hole 521, the outer end of the fastening rod 53 is configured as an arc end 531, the second connecting tube 52 is threadedly connected to a driving tube 54, and the driving tube 54 pushes the arc end 531 to make the inner end of the fastening rod 53 press against the cable 3. The other end of the retainer 41 is provided with an I-shaped plate 411, and connecting shafts 412 are provided on both sides of the I-shaped plate 411. The connecting shaft 412 is rotatably connected to the clamping plate 42, and the connecting shaft 412 is provided with a torsion spring 413 connected to the clamping plate 42. The height of one end of the retainer 41 from the ground is higher than the height of the other end of the retainer 41 from the ground. The cable 3 is sleeved with a support plate 6 and a second spring 7, and a third step portion 522 is provided in the second connecting tube 52. One end of the second spring 7 acts on the support plate 6, and the other end of the second spring 7 acts on the third step portion 522. The first connecting tube 51 is provided with a second through hole 511, and an indicator rod 9 is provided in the second through hole 511. A trigger member 8 is provided at the bottom of the support plate 6, and a first inclined surface 81 is provided on the side of the trigger member 8 close to the indicator rod 9, and a second inclined surface 91 is provided on the side of the indicator rod 9 close to the trigger member 8, and the first inclined surface 81 is parallel to the second inclined surface 91. A plurality of indicator rods 9 are evenly distributed around the axis of the first connecting tube 51, and the trigger member 8 is configured as a cylinder. One end of the driving tube 54 facing the fastening rod 53 is configured as an inclined surface 541 connected to the arc-shaped end 531. The first through hole 521 is provided with a first step portion 5211, the fastening rod 53 is provided with a second step portion 532, and the fastening rod 53 is sleeved with a first spring 55, and the two ends of the first spring 55 act on the first step portion 5211 and the second step portion 532 respectively. The number of the fastening rods 53 is at least three, and the fastening rods 53 are evenly distributed around the second connecting tube 52. The mounting frame 2 is provided with a guide frame 21 connected to the cable 3.

[0045] Therefore, the photovoltaic power station grid-connected cable protection device of the present invention has the beneficial effects of making the cable connection stable, not easy to loosen, and having a longer service life.

[0046] The above specific implementation methods further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A photovoltaic power station grid-connected cable protection device, characterized in that: The invention comprises a mounting frame (2) connected to an inverter (1), the mounting frame (2) being provided with a retaining component (4) for limiting the bending degree of a cable (3) and a fastening component (5) for fixing a joint of the cable (3); The retaining assembly (4) comprises a retaining frame (41), one end of the retaining frame (41) is hinged to the mounting frame (2), and the other end of the retaining frame (41) is provided with a clamping plate (42) for fixing the cable (3). The fastening assembly (5) comprises a first connecting tube (51) and a second connecting tube (52) connected to the inverter (1); the cable (3) passes through the first connecting tube (51) and the second connecting tube (52) and is connected to the inverter (1); the second connecting tube (52) is provided with a first through hole (521); a fastening rod (53) is provided in the first through hole (521); the outer end of the fastening rod (53) is configured as an arc-shaped end (531); the second connecting tube (52) is threadedly connected to a driving tube (54); the driving tube (54) pushes the arc-shaped end (531) to allow the inner end of the fastening rod (53) to press against the cable (3).

2. The photovoltaic power station grid-connected cable protection device according to claim 1, characterized in that: The other end of the retaining frame (41) is provided with an I-shaped plate (411), and connecting shafts (412) are provided on both sides of the I-shaped plate (411). The connecting shafts (412) are rotatably connected to the clamping plate (42), and the connecting shafts (412) are provided with torsion springs (413) connected to the clamping plate (42).

3. The photovoltaic power station grid-connected cable protection device according to claim 2, characterized in that: The height of one end of the retaining frame (41) from the ground is higher than the height of the other end of the retaining frame (41) from the ground.

4. The photovoltaic power station grid-connected cable protection device according to claim 1, characterized in that: The cable (3) is sleeved with a support plate (6) and a second spring (7); a third step portion (522) is provided in the second connecting tube (52); one end of the second spring (7) acts on the support plate (6); and the other end of the second spring (7) acts on the third step portion (522).

5. The photovoltaic power station grid-connected cable protection device according to claim 4, characterized in that: The first connecting tube (51) is provided with a second through hole (511), an indicating rod (9) is provided in the second through hole (511), a trigger member (8) is provided at the bottom of the support plate (6), a first inclined surface (81) is provided on a side of the trigger member (8) close to the indicating rod (9), a second inclined surface (91) is provided on a side of the indicating rod (9) close to the trigger member (8), and the first inclined surface (81) is parallel to the second inclined surface (91).

6. The photovoltaic power station grid-connected cable protection device according to claim 5, characterized in that: A plurality of indicating rods (9) are evenly distributed around the axis of the first connecting tube (51), and the triggering member (8) is configured as a cylinder.

7. The photovoltaic power station grid-connected cable protection device according to claim 1, characterized in that: One end of the driving tube (54) facing the fastening rod (53) is configured as an inclined surface (541) connected to the arc-shaped end (531).

8. The photovoltaic power station grid-connected cable protection device according to claim 1, characterized in that: The first through hole (521) is provided with a first step portion (5211), the fastening rod (53) is provided with a second step portion (532), the fastening rod (53) is sleeved with a first spring (55), and two ends of the first spring (55) act on the first step portion (5211) and the second step portion (532) respectively.

9. The photovoltaic power station grid-connected cable protection device according to claim 1, characterized in that: The number of the fastening rods (53) is at least three, and the fastening rods (53) are evenly distributed around the second connecting pipe (52).

10. A photovoltaic power station grid-connected cable protection device according to any one of claims 1 to 9, characterized in that: The mounting frame (2) is provided with a guide frame (21) connected to the cable (3).

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