Cable control system for photovoltaic power generation

Abstract

The invention relates to the technical field of photovoltaic power generation equipment, in particular to a cable control system for photovoltaic power generation, and the system comprises a heat insulation supporting mechanism which is used for separating a wire inlet mechanism from a combiner box; the wire inlet mechanism is used for connecting a photovoltaic inlet wire into the combiner box; the wire inlet mechanism is internally provided with a heat isolation mechanism, and the heat isolation mechanism is used for cutting off the connection between the photovoltaic inlet wire and the combiner box when the temperature of the photovoltaic inlet wire exceeds a threshold value. The detection mechanism is used for detecting whether the heat isolation mechanism acts or not, converting the action into a switching value signal and inputting the switching value signal into the control device; and the control device is used for controlling the alarm module to send alarm information according to the switching value signal. According to the cable control system for photovoltaic power generation, when a photovoltaic cable is installed on site, the photovoltaic incoming line is directly wound on the winding part and then connected with the first connecting copper bar, fire hazards are controlled outside the combiner box, and practicability is high.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic power generation equipment, and in particular to a cable control system for photovoltaic power generation. Background Art

[0002] The statements in this section merely provide background technical information related to the present application and do not necessarily constitute prior art.

[0003] The photovoltaic combiner box is a device for parallel convergence of the output currents of multiple photovoltaic cell arrays of photovoltaic power generation. Its function is to connect the output cables of multiple photovoltaic cell arrays in parallel and then connect them to the inverter, which simplifies the system structure, saves wiring cables, and improves reliability and maintainability. However, because it converges multiple photovoltaic incoming cables, the temperature inside and outside the combiner box is bound to be relatively high, and fire is prone to occur in serious cases.

[0004] In the existing technology, there are many measures for combiner boxes, including the risk of combiner box fire and photovoltaic incoming line disconnection warning, but most of them are for detection and prevention inside the combiner box, and there are few measures for detection and prevention of cables outside the combiner box; and the technical means used for the inside of the combiner box are to judge by collecting temperature and to judge by collecting current. However, no matter which means is used, by the time measures are taken after detection, the fire has basically formed in the combiner box or the temperature is already very high, which is very easy to cause a fire. If the alarm threshold is set low, the utilization efficiency of photovoltaic power is reduced.

[0005] As for the detection and prevention measures for the cables outside the junction box, since photovoltaic power generation itself is obviously affected by light, different photovoltaic panels at different angles and different sunlight intensities at the same time will cause changes in current. The instability of the current itself can easily cause the photovoltaic cables to heat up. In addition, photovoltaic cables are mostly located in areas with high sunshine intensity. When the temperature of the photovoltaic cables reaches a certain level, it will also cause the cables to heat up and cause fire safety hazards. This kind of safety hazard is difficult to judge by current, and there are no fire prevention and control measures for photovoltaic power generation cables outside the junction box in the prior art.

[0006] In view of this, it is necessary to provide a cable control system for photovoltaic power generation to solve the above technical problems. Summary of the invention

[0007] Based on this, in order to solve the above technical problems, the present application provides a cable control system for photovoltaic power generation.

[0008] The technical solution adopted by this application to solve the problems existing in the prior art is: This application proposes a cable control system for photovoltaic power generation, including: The heat insulation support mechanism is fixed on the combiner box and is used to separate the incoming line mechanism from the combiner box; The incoming line mechanism is fixedly mounted on the heat-insulating support mechanism and is used to connect the photovoltaic incoming line to the combiner box; a thermal isolation mechanism is provided inside the incoming line mechanism, and the thermal isolation mechanism is used to cut off the connection between the photovoltaic incoming line and the combiner box when the temperature of the photovoltaic incoming line exceeds a threshold value; A detection mechanism, used to detect whether the thermal isolation mechanism is actuated and convert its actuation into a switch signal and input it into a control device; The control device is used to receive the switch signal of the detection mechanism and control the alarm module to issue an alarm message according to the switch signal.

[0009] Preferably, the heat insulation support mechanism comprises a heat insulation board, and both ends of the heat insulation board are fixedly connected to the junction box through heat insulation columns; a heat insulation space is formed between the heat insulation board and the junction box.

[0010] Preferably, the line inlet mechanism comprises a partition fixedly connected to the heat insulation board, and a heat isolation mechanism is fixedly mounted on the partition; The thermal isolation mechanism comprises a mounting screw which is fixedly connected to the partition plate by thread, a winding portion is fixedly provided below the mounting screw, a cavity is formed inside the winding portion and the mounting screw, a spacing cylinder is fixedly provided at the bottom of the winding portion inside the cavity, and an ejection portion is slidably provided inside the spacing cylinder; an opening is provided at the top of the mounting screw, and the opening is connected to the cavity; the ejection portion is fixedly connected to the third connecting copper bar after sliding through the opening at the top of the mounting screw; Paraffin is arranged outside the spacer tube in the cavity; A second spring is fixedly disposed in the spacing tube between the ejection portion and the winding portion; The first connecting copper bar and the second connecting copper bar are respectively provided on both sides of the third connecting copper bar on the partition; when the third connecting copper bar is lifted up by the ejection part, the two ends of the third connecting copper bar are disconnected from the first connecting copper bar and the second connecting copper bar; when the third connecting copper bar is not lifted up by the ejection part, the two ends of the third connecting copper bar are respectively connected to the first connecting copper bar and the second connecting copper bar; One end of the photovoltaic inlet line is electrically connected to the photovoltaic panel, and the other end is wound around the winding part and electrically connected to the first connecting copper busbar; The second connecting copper bar passes through a wire threading tube fixed in the heat insulation board and enters the junction box through the inlet pipeline.

[0011] Preferably, the detection mechanism comprises two guide slide bars fixed on the partition plate and slidably inserted into the third connecting copper bar; A fixing plate is fixedly provided on the top of the two guide slide bars, a pressure plate is provided below the fixing plate, two first springs are symmetrically provided between the fixing plate and the pressure plate, and two ends of the first spring are fixedly connected to the fixing plate and the pressure plate respectively; A first electrode is fixedly disposed above the pressure bearing plate, and a second electrode matching the first electrode is fixedly disposed below the fixing plate. The first electrode is connected to one end of the first lead wire; the second electrode is connected to one end of the second lead wire; the other end of the first lead wire and the other end of the second lead wire are electrically connected to the control device.

[0012] Preferably, one end of the second spring is fixedly connected to the ejection portion, and the other end of the second spring is fixedly connected to the winding portion.

[0013] Preferably, the ejection portion comprises an inner slide bar slidably arranged in the spacer tube, an outer slide tube is arranged outside the inner slide bar, the top of the outer slide tube is fixedly connected to the top of the inner slide bar, and a slide cavity is formed between the outer slide tube and the inner slide bar; A first sealing ring is fixedly disposed on the outer side of the top of the spacer cylinder, and the first sealing ring is slidably connected to the inner wall of the outer sliding cylinder; A second sealing ring is fixedly disposed on the inner side of the bottom of the outer sliding cylinder, and the second sealing ring is slidably connected to the outer wall of the spacing cylinder; The outer sliding cylinder is slidably arranged in the opening at the top end of the mounting screw rod.

[0014] Preferably, the first sealing ring, the second sealing ring and the opening at the top end of the mounting screw are all provided with sliding sealing rings.

[0015] Preferably, a first baffle and a second baffle are fixedly provided at both ends of the winding portion, respectively.

[0016] Preferably, a tightening screw is fixedly provided at the bottom of the winding portion; A lower shell is arranged outside the winding part, and a mounting hole matching with the tightening screw is arranged in the middle of the lower shell; When the lower shell is buckled outside the winding part, the lower shell is fixed by screwing the tightening nut onto the tightening screw.

[0017] Preferably, the first connecting copper bar is connected to the photovoltaic incoming line through a connecting terminal fixed on the partition; An upper shell is provided above the partition, and a line passage for passing photovoltaic lines is opened on the upper shell. The upper shell is provided with fixing edges on two sides and one side adjacent to the insulation board, and the upper shell is fixed by installing fixing screws on the fixing edges.

[0018] Compared with the prior art, the beneficial effects of this application are: 1. Existing monitoring measures for photovoltaic power generation cables generally monitor the current of photovoltaic cables. When the current exceeds the set value, alarm processing measures are taken, which has a lag, because the current has exceeded the set value, and it is very likely that the danger has occurred; and the processing measures are generally to disconnect all photovoltaic incoming lines indiscriminately. At the same time, the targeting is poor, because the location of disconnecting the photovoltaic incoming line is inside the junction box, so although the photovoltaic incoming line is disconnected, since there are multiple photovoltaic incoming lines in the junction box, if a fire has occurred, the remaining photovoltaic incoming lines will inevitably be affected.

[0019] The photovoltaic power generation cable control system of the present application is highly targeted and can control fire hazards outside the junction box.

[0020] 2. Most of the existing monitoring measures for photovoltaic power generation cables only consider that the temperature rise of the photovoltaic incoming line is caused by the current, but do not consider that the photovoltaic incoming line is also prone to fire due to strong sunlight. The present application does not collect the current of the photovoltaic incoming line but directly controls the on and off of the photovoltaic incoming line by the temperature of the photovoltaic incoming line. The monitoring is more comprehensive. In addition, due to the heat conduction phenomenon of the conductor in the photovoltaic incoming line, the temperature rise caused by the heating of the cable due to excessive current or rapid changes can also be monitored.

[0021] 3. Easy to use. In actual use, the part of the incoming line device in this application except the photovoltaic incoming line can be directly installed on the junction box. When installing the photovoltaic cable on site, the photovoltaic incoming line can be directly wound on the winding part and then connected to the first connecting copper busbar. It is very practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0023] Figure 1 This is a schematic diagram of the overall installation structure of a photovoltaic power generation cable control system for this application. Figure 2 for Figure 1 A partial enlarged view of area A in the middle. Figure 3 This is a schematic diagram of the overall structure of a cable entry mechanism for a photovoltaic power generation cable control system of the present application. Figure 4 for Figure 3 The overall structural diagram of the central feeder mechanism from another angle. Figure 5 for Figure 3 Schematic diagram of the overall internal structure of the central line feed mechanism after removing the upper and lower shells. Figure 6 for Figure 5 A partial enlarged view of area B in the middle. Figure 7 for Figure 3 Schematic diagram of the overall structure of the upper shell of the central line feed mechanism. Figure 8 for Figure 3 Schematic diagram of the overall structure of the lower shell of the central line feeding mechanism. Fig. 9 This is a schematic diagram of the overall structure of a thermal isolation mechanism of a photovoltaic power generation cable control system of the present application. Fig.10 for Fig. 9 Schematic diagram of the internal cross-sectional structure of the medium heat isolation mechanism.

[0024] In the figure: 1. Combiner box, 100. Insulation board, 101. Insulation column, 102. Insulation space, 103. Inlet pipeline, 2. Cable inlet mechanism, 3. Cable outlet, 4. Upper shell, 40. Fixed edge, 41. Wire opening, 5. Lower housing, 6. Photovoltaic inlet line, 7. Flame retardant gasket, 8. Mounting plate, 9. Thermal cutoff mechanism, 90. Tightening screw, 91. First stopper, 92. Winding part, 93. Second stopper, 94. Mounting screw, 95, ejector, 950, inner slide rod, 951, outer slide cylinder, 952, slide cavity, 953, second sealing ring, 96. Insulation column, 97, spacer tube, 970, first sealing ring, 98. Second spring, 99. Cavity, 10. Partition, 11. First connecting copper busbar, 12. Connecting terminal, 13. Pillar, 14. Second connecting copper busbar, 15. Wire threading tube, 16. Third connecting copper busbar, 17. Fixing plate, 18. First electrode, 19. Second electrode, 20. Second lead wire, 21. First lead wire, 22. First spring, 23. Second connecting port, 24. First connecting port, 25. Guide slide rod, 26. Tighten nut, 27. Pressure plate. DETAILED DESCRIPTION The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure and should not be understood as limitations on the present disclosure.

[0028] The present application discloses a photovoltaic power generation cable control system, comprising a heat insulation support mechanism, a line feeder mechanism 2, a detection mechanism and a control device, wherein a heat isolation mechanism 9 is provided in the line feeder mechanism. Figure 1 , Figure 1 The overall installation structure diagram of a photovoltaic power generation cable control system of the present application is shown. The control device is arranged inside the junction box 1 in the figure, and the heat insulation support mechanism, the line feeding mechanism 2 and the detection mechanism are arranged outside the junction box 1. Specifically, refer to Figures 1 to 6 : The heat insulation support mechanism is fixedly arranged on the combiner box 1 and is used to separate the incoming line mechanism 2 from the combiner box 1; The incoming line mechanism 2 is fixedly arranged on the heat-insulating support mechanism, and is used to connect the photovoltaic incoming line 6 to the combiner box 1; the incoming line mechanism 2 is provided with a thermal isolation mechanism 9, and the thermal isolation mechanism 9 is used to cut off the connection between the photovoltaic incoming line 6 and the combiner box 1 when the temperature of the photovoltaic incoming line 6 exceeds a threshold value; A detection mechanism, used to detect whether the thermal isolation mechanism 9 is in operation and convert its operation into a switch signal and input it into the control device; The control device is used to receive the switch signal of the detection mechanism and control the alarm module to issue an alarm message according to the switch signal.

[0029] In the present application, the heat-insulating support mechanism serves to separate the incoming line mechanism 2 from the junction box 1. The heat-insulating plate 100 of the heat-insulating support mechanism is made of insulating fireproof material. The purpose is to prevent the junction box 1 from fire when a fire occurs in the photovoltaic incoming line 6 at the incoming line mechanism 2. A thermal isolation mechanism 9 is also provided in the incoming line mechanism 2 for cutting off the photovoltaic incoming line 6 when the temperature of the photovoltaic incoming line 6 is too high. In addition, the detection mechanism in the present application obtains a switching signal. Compared with analog signals such as current and voltage, the switching signal has a stronger anti-interference ability and is more suitable for harsh environments with multiple groups of photovoltaic incoming lines 6 and high temperatures. There are multiple incoming line mechanisms 2 in the present application, and the number is the same as the number of photovoltaic incoming lines 6, that is, each photovoltaic incoming line 6 corresponds to one incoming line mechanism 2.

[0030] refer to Figure 2 The heat insulation support mechanism includes a heat insulation board 100 , and both ends of the heat insulation board 100 are fixedly connected to the junction box 1 through heat insulation columns 101 ; a heat insulation space 102 is formed between the heat insulation board 100 and the junction box 1 .

[0031] refer to Figure 5 and Figure 6 The line inlet mechanism 2 includes a partition 10 fixedly connected to the heat insulation board 100, and a heat isolation mechanism 9 is fixedly installed on the partition 10; Fig. 9 and Fig.10The thermal isolation mechanism 9 includes a mounting screw 94 that is threadedly fixedly connected to the partition 10, a winding portion 92 is fixedly provided below the mounting screw 94, a cavity 99 is formed inside the winding portion 92 and the mounting screw 94, a spacing cylinder 97 is fixedly provided inside the cavity 99 at the bottom of the winding portion 92, and an ejection portion 95 is slidably provided inside the spacing cylinder 97; an opening is opened at the top of the mounting screw 94, and the opening is connected to the cavity 99; the ejection portion 95 slides through the opening at the top of the mounting screw 94 and is fixedly connected to the third connecting copper bar 16; paraffin is provided outside the spacing cylinder 97 in the cavity 99; a second spring 98 is fixedly provided inside the spacing cylinder 97 between the ejection portion 95 and the winding portion 92; the partition 10, the first connecting copper bar 11 and the second connecting copper bar 14 are respectively arranged on both sides of the third connecting copper bar 16; when the third connecting copper bar 16 is lifted by the ejection part 95, the two ends of the third connecting copper bar 16 are disconnected from the first connecting copper bar 11 and the second connecting copper bar 14; when the third connecting copper bar 16 is not lifted by the ejection part 95, the two ends of the third connecting copper bar 16 are respectively connected to the first connecting copper bar 11 and the second connecting copper bar 14; one end of the photovoltaic inlet line 6 is electrically connected to the photovoltaic panel, and the other end is wound around the winding part 92 and electrically connected to the first connecting copper bar 11; the second connecting copper bar 14 passes through the threading tube 15 fixedly arranged in the heat insulation board 100, and enters the junction box 1 through the inlet pipeline 103. In some embodiments, a flame retardant gasket 7 is arranged between the inlet pipeline 103 and the junction box 1. One end of the second spring 98 is fixedly connected to the ejection part 95, and the other end is fixedly connected to the winding part 92. The first connecting copper bar 11 is connected to the photovoltaic inlet line 6 via a connecting terminal 12 fixed on the partition 10; The principle of the above embodiment is: when the temperature of the photovoltaic incoming line 6 rises, since the photovoltaic incoming line 6 is wound outside the winding part 92, after the winding part 92 senses the temperature rise, the paraffin in the internal cavity 99 of the winding part 92 undergoes a solid-liquid phase change with the change in temperature, from solid to gas, and expands in volume, thereby pushing the ejection part 95, and the third connecting copper bar 16 is lifted up, thereby disconnecting the first connecting copper bar 11 and the second connecting copper bar 14, and realizing the cutting off of the photovoltaic incoming line 6. The melting point of paraffin is 57℃-120℃, and the melting point of the new polyethylene wax is 110℃-120℃. In actual use, the appropriate type of paraffin can be selected according to the actual situation. The working temperature of the photovoltaic power generation output cable, that is, the photovoltaic incoming line 6 in this application is generally below 90℃, and palm wax can be used.

[0032] In the present application, the second spring 98 is designed because: as the use time increases, dust is easily accumulated between the opening at the top of the mounting screw 94 and the ejection part 95, making it relatively easy for the ejection part 95 to be ejected, but when the temperature drops, the ejection part 95 is not easy to reset, and the second spring 98 plays a role in increasing the reset ability of the ejection part 95. At the same time, since the ejection part 95 needs to overcome the pulling force of the second spring 98 when ejecting, the ejection part 95 will be ejected only when the solid-liquid phase change of the paraffin wax reaches a certain degree and can completely overcome the pulling force of the second spring 98. This avoids the jitter of the ejection part 95 when the temperature is at the critical point of the paraffin phase change, and ensures the reliability of the connection between the first connecting copper bar 11, the second connecting copper bar 14 and the third connecting copper bar 16. In this case, the temperature threshold can be appropriately lowered according to the actual situation.

[0033] refer to Figure 5 and Figure 6 The detection mechanism includes two guide slide bars 25 fixed on the partition 10 and slidably penetrated in the third connecting copper bar 16, and the guide slide bars 25 are made of insulating material; a fixed plate 17 is fixed on the top of the two guide slide bars 25, and a pressure plate 27 is provided below the fixed plate 17, and both the fixed plate 17 and the pressure plate 27 are made of insulating material; two first springs 22 are symmetrically provided between the fixed plate 17 and the pressure plate 27, and the two ends of the first spring 22 are fixedly connected to the fixed plate 17 and the pressure plate 27 respectively; a first electrode 18 is fixed above the pressure plate 27, and a second electrode 19 cooperating with the first electrode 18 is fixed below the fixed plate 17, and the first electrode 18 is connected to one end of the first lead wire 21; the second electrode 19 is connected to one end of the second lead wire 20; the other end of the first lead wire 21 and the other end of the second lead wire 20 are electrically connected to the control device.

[0034] When the third connecting copper bar 16 is lifted up, the pressure plate 27 is pressed, the first spring 22 is compressed, and the first electrode 18 and the second electrode 19 are in contact, so that the first lead wire 21 and the second lead wire 20 are connected.

[0035] In some embodiments, the control device is a single chip microcomputer, which has the same number of digital input interfaces as the line feeder mechanism 2 ; each digital input interface is electrically connected to a first lead wire 21 and a second lead wire 20 of a line feeder mechanism 2 .

[0036] When the third connecting copper bus 16 is lifted up, the first lead-out line 21 and the second lead-out line 20 are connected, and the control device receives the switch signal of the detection mechanism; after the control device receives the switch signal of the detection mechanism, it sends an alarm message to the staff through the alarm module electrically connected thereto. This is a conventional technical means for those skilled in the art and will not be elaborated on.

[0037] In some embodiments, reference Fig. 9 and Fig.10 The ejection part 95 includes an inner slide bar 950 slidably arranged in the spacer tube 97, an outer slide bar 951 is arranged outside the inner slide bar 950, the top of the outer slide bar 951 is fixedly connected to the top of the inner slide bar 950, and a sliding cavity 952 is formed between the outer slide bar 951 and the inner slide bar 950; a first sealing ring 970 is fixedly arranged outside the top of the spacer tube 97, and the first sealing ring 970 is slidably connected to the inner wall of the outer slide bar 951; a second sealing ring 953 is fixedly arranged inside the bottom of the outer slide bar 951, and the second sealing ring 953 is slidably connected to the outer wall of the spacer tube 97; the outer slide bar 951 is slidably penetrated into the opening at the top of the mounting screw 94. The purpose of this design is to ensure the smooth ejection stroke of the ejection part 95.

[0038] In some embodiments, sliding sealing rings are provided in the openings at the top ends of the first sealing ring 970 , the second sealing ring 953 , and the mounting screw 94 .

[0039] In some embodiments, in order to prevent the photovoltaic inlet line 6 wound on the winding part 92 from falling, a first baffle 91 and a second baffle 93 are fixed at both ends of the winding part 92, and the photovoltaic inlet line 6 wound on the winding part 92 is located between the first baffle 91 and the second baffle 93; at the same time, a tightening screw 90 is fixed at the bottom of the winding part 92; a lower outer shell 5 is provided outside the winding part 92, and a mounting hole matching the tightening screw 90 is provided in the middle of the lower outer shell 5; when the lower outer shell 5 is buckled on the outside of the winding part 92, the lower outer shell 5 is fixed by screwing the tightening nut 26 on the tightening screw 90, and the photovoltaic inlet line 6 wound on the winding part 92 is further prevented from falling off through the lower outer shell 5, and at the same time, the photovoltaic inlet line 6 will not be compressed.

[0040] In some embodiments, an upper housing 4 is provided above the partition 10. Figure 7 The upper shell 4 is provided with a line opening 41 for passing the photovoltaic incoming line 6. The upper shell 4 is provided with fixing edges 40 on both sides and one side adjacent to the insulation board 100. The upper shell 4 is fixed by installing fixing screws on the fixing edges 40.

[0041] The photovoltaic power generation cable control system of the present application is highly targeted and controls the fire hazard outside the junction box. In actual use, the part of the incoming line device of the present application except the photovoltaic incoming line can be directly installed on the junction box. When installing on site, the photovoltaic incoming line can be directly wound on the winding part and then installed and connected with the first connecting copper busbar, which is highly practical.

[0042] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0043] Although the above describes the specific implementation methods of the present application in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present application. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present application, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present application.

Claims

1. A photovoltaic power generation cable control system, characterized in that: include: A heat insulation support mechanism, fixedly arranged on the combiner box (1), and used to separate the line-incoming mechanism (2) from the combiner box (1); The incoming line mechanism (2) is fixedly mounted on the heat-insulating support mechanism and is used to connect the photovoltaic incoming line (6) to the combiner box (1); a thermal isolation mechanism (9) is provided inside the incoming line mechanism (2), and the thermal isolation mechanism (9) is used to cut off the connection between the photovoltaic incoming line (6) and the combiner box (1) when the temperature of the photovoltaic incoming line (6) exceeds a threshold value; A detection mechanism, used to detect whether the thermal isolation mechanism (9) is actuated and convert its actuation into a switch signal and input it into a control device; The control device is used to receive the switch signal of the detection mechanism and control the alarm module to issue an alarm message according to the switch signal.

2. A photovoltaic power generation cable control system according to claim 1, characterized in that: The heat insulation support mechanism comprises a heat insulation board (100), and both ends of the heat insulation board (100) are fixedly connected to the junction box (1) via heat insulation columns (101); a heat insulation space (102) is formed between the heat insulation board (100) and the junction box (1).

3. A photovoltaic power generation cable control system according to claim 2, characterized in that: The line inlet mechanism (2) comprises a partition (10) fixedly connected to the heat insulation plate (100), and a heat isolation mechanism (9) is fixedly mounted on the partition (10); The thermal isolation mechanism (9) comprises a mounting screw (94) threadedly fixedly connected to the partition (10), a winding portion (92) being fixedly provided below the mounting screw (94), a cavity (99) being formed inside the winding portion (92) and the mounting screw (94), a spacing cylinder (97) being fixedly provided at the bottom of the winding portion (92) inside the cavity (99), and an ejection portion (95) being slidably provided inside the spacing cylinder (97); an opening is provided at the top of the mounting screw (94), the opening being communicated with the cavity (99); the ejection portion (95) is fixedly connected to the third connecting copper bar (16) after sliding through the opening at the top of the mounting screw (94); Paraffin is provided in the cavity (99) outside the spacer cylinder (97); A second spring (98) is fixedly provided in a spacing cylinder (97) between the ejection portion (95) and the winding portion (92); A first connecting copper bar (11) and a second connecting copper bar (14) are respectively provided on both sides of the third connecting copper bar (16) on the partition (10); when the third connecting copper bar (16) is lifted up by the ejection portion (95), two ends of the third connecting copper bar (16) are disconnected from the first connecting copper bar (11) and the second connecting copper bar (14); when the third connecting copper bar (16) is not lifted up by the ejection portion (95), two ends of the third connecting copper bar (16) are respectively connected to the first connecting copper bar (11) and the second connecting copper bar (14); One end of the photovoltaic inlet line (6) is electrically connected to the photovoltaic panel, and the other end is wound around the winding portion (92) and electrically connected to the first connecting copper bus (11); The second connecting copper bar (14) passes through a wire threading tube (15) fixed in the heat insulation board (100) and enters the junction box (1) through the inlet pipeline (103).

4. A photovoltaic power generation cable control system according to claim 3, characterized in that: The detection mechanism comprises two guide slide bars (25) fixed on the partition plate (10) and slidably inserted into the third connecting copper bar (16); A fixing plate (17) is fixedly provided on the top of the two guide slide bars (25), a pressure plate (27) is provided below the fixing plate (17), two first springs (22) are symmetrically provided between the fixing plate (17) and the pressure plate (27), and two ends of the first spring (22) are fixedly connected to the fixing plate (17) and the pressure plate (27), respectively; A first electrode (18) is fixedly provided above the pressure-bearing plate (27), and a second electrode (19) cooperating with the first electrode (18) is fixedly provided below the fixed plate (17). The first electrode (18) is connected to one end of a first lead wire (21); the second electrode (19) is connected to one end of a second lead wire (20); and the other end of the first lead wire (21) and the other end of the second lead wire (20) are electrically connected to a control device.

5. A photovoltaic power generation cable control system according to claim 3, characterized in that: One end of the second spring (98) is fixedly connected to the ejection portion (95), and the other end is fixedly connected to the winding portion (92).

6. A photovoltaic power generation cable control system according to claim 3, characterized in that: The ejection portion (95) comprises an inner sliding rod (950) slidably arranged in a spacing cylinder (97), an outer sliding cylinder (951) is arranged outside the inner sliding rod (950), the top of the outer sliding cylinder (951) is fixedly connected to the top of the inner sliding rod (950), and a sliding cavity (952) is formed between the outer sliding cylinder (951) and the inner sliding rod (950); A first sealing ring (970) is fixedly provided on the outer side of the top of the spacing cylinder (97), and the first sealing ring (970) is slidably connected to the inner wall of the outer sliding cylinder (951); A second sealing ring (953) is fixedly provided on the inner side of the bottom of the outer sliding cylinder (951), and the second sealing ring (953) is slidably connected to the outer wall of the spacing cylinder (97); The outer sliding cylinder (951) is slidably inserted into the opening at the top end of the mounting screw rod (94).

7. A photovoltaic power generation cable control system according to claim 6, characterized in that: Sliding sealing rings are provided in the openings at the top ends of the first sealing ring (970), the second sealing ring (953) and the mounting screw rod (94).

8. A photovoltaic power generation cable control system according to claim 6, characterized in that: A first baffle (91) and a second baffle (93) are respectively fixedly provided at both ends of the winding portion (92).

9. A photovoltaic power generation cable control system according to claim 6, characterized in that: A tightening screw (90) is fixedly provided at the bottom of the winding portion (92); A lower housing (5) is disposed outside the winding portion (92), and a mounting hole cooperating with the tightening screw (90) is disposed in the middle of the lower housing (5); When the lower housing (5) is buckled outside the winding portion (92), the lower housing (5) is fixed by screwing the tightening nut (26) onto the tightening screw (90).

10. A photovoltaic power generation cable control system according to claim 6, characterized in that: The first connecting copper bar (11) is connected to the photovoltaic incoming line (6) via a connecting terminal (12) fixedly arranged on the partition (10); An upper shell (4) is provided above the partition (10), and a line passage (41) for passing a photovoltaic incoming line (6) is provided on the upper shell (4). The upper shell (4) is provided with fixing edges (40) on both sides and on a side adjacent to the heat insulation board (100), and fixing screws are installed on the fixing edges (40) to fix the upper shell (4).

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