Photovoltaic power generation system cable cabinet convenient for maintenance

Abstract

The present application relates to photovoltaic cable cabinet technical field, specifically, it relates to a kind of cable cabinet for photovoltaic power generation system convenient to overhaul.It includes cable cabinet body, the surface of inner plate is provided with multiple wire fixing structure, when the cable body somewhere fails and is hot, the wire sealing part of wire fixing body will be deformed due to heat, and send warning to maintenance personnel in visual way, in this process, wire fixing body and cable body will form a detection cavity.The memory metal material of fastening piece efficiently conducts heat through the convex point structure of heat collecting fin when the surface temperature of cable body somewhere is abnormally increased due to damage, triggers the deformation of fastening piece from U shape to straight plate shape, at this time, fastening piece is separated from cable surface, detection cavity is formed, compared with traditional section-by-section checking mode, maintenance personnel can quickly lock temperature abnormal area, realize the closed-loop feedback of "temperature anomaly-shape change-visual warning".

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic cable cabinet, in particular to a cable cabinet for photovoltaic power generation system facilitating maintenance. BACKGROUND

[0002] The photovoltaic power generation system is a device for converting solar energy into electric energy by using solar panels, and converting, transmitting and distributing electric energy by electrical equipment. In the system, the cable cabinet, as a key hub for power transmission and distribution, bears the important functions of collecting, distributing and protecting the cable line. The power cables of various devices such as solar panels, inverters and transformers need to be connected inside the cable cabinet to ensure stable power transmission to the power grid or load end.

[0003] As the scale of the photovoltaic power generation system continues to expand, the number of cables in the cable cabinet is large and the specifications are different. In order to make full use of space, cables are often arranged densely, including horizontal layering, vertical wiring and multi-layer staggered arrangement.

[0004] This complex layout of the cable makes it easy to entangle with each other during installation and maintenance, resulting in disordered cable routing. When the cable is damaged due to short circuit, aging, etc., a high heat will be generated at the fault point, causing the surface temperature of the cable to rise sharply. If the cable cannot be placed in order, the high temperature will be conducted and diffused through the surface of the cables in contact with each other, causing temperature abnormalities in multiple places of the cable. This not only makes it difficult for maintenance personnel to locate the fault point, but also further increases the difficulty of troubleshooting because of misjudgment of other heated cables as fault sources. Maintenance personnel need to spend a lot of time combing the line and analyzing the temperature conduction path, which not only reduces the maintenance efficiency, but also may affect the normal operation of the photovoltaic power generation system due to the delay in handling the fault, increasing the operation and maintenance cost and safety hazards.

[0005] Therefore, there is an urgent need for a cable cabinet for photovoltaic power generation system facilitating maintenance to solve the above problems. SUMMARY

[0006] The present application provides a cable cabinet for photovoltaic power generation system facilitating maintenance, which fixes the cable body by forming a cable clamping cavity with the lateral limiting block and the front end base, and cooperates with the U-shaped clamping structure of the fastening piece to keep the cable in the preset routing path. When the temperature of the cable rises due to short circuit, overload and other faults, the heat is efficiently conducted to the fastening piece made of memory metal material by the heat collecting piece, triggering the austenitic phase change to make it flatten from U-shaped to straight plate shape. The maintenance personnel can quickly locate the fault point through the visual deformation and deformation indicator, and directly detect the insulation layer and conductivity by using the detection cavity formed after deformation, thereby solving the problems raised in the above background technology, i.e.

[0007] With the expansion of the photovoltaic power generation system, the complex layout of the densely intertwined cables in the cable cabinet is easy to cause cable entanglement and chaos, which causes heat diffusion and makes it difficult to locate the fault point when a fault occurs, greatly increasing the maintenance difficulty and operation and maintenance cost, and threatening the normal operation of the system.

[0008] To achieve the above object, the cable cabinet body includes a cabinet body, an electrical structure installation cavity is formed in the inside of the cabinet body, a cabinet door is rotatably arranged at the opening of the electrical structure installation cavity, an inner plate is fixedly installed in the inside of the electrical structure installation cavity, a plurality of electrical elements are installed on the surface of the inner plate, and a plurality of cable bodies are connected between the plurality of electrical elements;

[0009] A plurality of wire fixing structures are arranged on the surface of the inner plate, the wire fixing structure includes a plurality of wire fixing bodies, the plurality of wire fixing bodies assist the cable body to arrange on the surface of the inner plate, and adjacent wire fixing bodies are placed in a staggered manner.

[0010] When a fault heat occurs at a certain position of the cable body, the wire fixing part of the wire fixing body will be deformed due to heat, so as to visually warn the maintenance personnel, and in this process, a detection cavity is formed between the wire fixing body and the cable body.

[0011] In the above technical solution, the layout of the densely intertwined cables in the cable cabinet of the photovoltaic power generation system is easy to cause heat diffusion and make it difficult to locate the fault point when a fault occurs, and the wire fixing body in the wire fixing structure forms a cable clamping cavity with the mirror-symmetrical lateral limiting block and the front end base, so as to fix the cable body in the preset path and arrange the cable body in a staggered manner, thereby avoiding cable entanglement and chaos; meanwhile, the fastening sheet made of memory metal on the wire fixing body cooperates with the heat collecting sheet, the heat insulation coating and other components, so as to accurately perceive the heat generated by the cable body fault and trigger phase change, so as to form a fault indication and a detection space through visual deformation and a detection cavity, thereby improving the maintenance efficiency, reducing the operation and maintenance cost and safety hazards.

[0012] On this basis, a plugging piece is installed at the opening of each groove, the plugging piece is used for longitudinally limiting the fastening sheet, and the plugging piece can block the temperature sensing of the fastening sheet B; on one hand, the plugging piece longitudinally limits the fastening sheet through cooperation with the groove opening, so as to ensure the clamping stability of the wire fixing body to the cable body, and on the other hand, the plugging piece is made of heat insulation material, so as to block the heat conduction of other electrical elements or adjacent cables in the cable cabinet to the fastening sheet, avoid the fastening sheet from being deformed due to the environmental heat interference of non-cable body fault, and improve the accuracy and reliability of fault detection.

[0013] In addition, a heat collecting sheet is laid on the side surface of the A-direction surface of the fastening sheet close to the cable body, and the outer wall of the heat collecting sheet is in a convex point structure.

[0014] The side surface of the fastening sheet away from the heat collecting sheet is coated with a heat insulation coating in the A direction.

[0015] Specifically, the convex point structure of the heat collecting sheet increases the contact area with the cable body, reduces the air gap thermal resistance, and enables the heat generated by the cable failure to be more efficiently conducted to the fastening sheet, accelerating the phase change triggering speed; and the heat insulation coating blocks the environmental heat from the non-detection direction, avoiding the fastening sheet from being misdeformed due to interference of other heat sources, ensuring that it only responds to abnormal temperature changes of the cable body, and improving the reliability and accuracy of fault detection.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] Through the cooperation of the two lateral limiting blocks and the U-shaped fastening sheet, a three-dimensional limiting structure is formed in the cable clamp cavity, the lateral limiting blocks provide left and right fixed fulcrums, the U-shaped corner of the fastening sheet abuts against the cable surface, and the cable body is arranged in an orderly layout in cooperation with the misaligned placement of the wire fixing device body, solving the problem of internal line disorder of the cable cabinet body and laying an orderly foundation for subsequent maintenance;

[0018] When the surface temperature of the cable body abnormally rises due to damage at a certain place, the memory metal material of the fastening sheet efficiently conducts heat through the convex point structure of the heat collecting sheet, triggering the deformation of the fastening sheet from a U shape to a straight plate shape, at which time the fastening sheet is separated from the cable surface, and a detection cavity is formed. Compared with the traditional step-by-step checking method, the maintenance personnel can quickly lock the temperature abnormal area, realizing the closed-loop feedback of "temperature abnormality-shape change-visual warning";

[0019] After the fastening sheet is deformed by heat, a detection cavity is automatically formed between the fastening sheet and the cable body, which can meet the electrical detection requirement without manual disassembly of the clamp, and the maintenance personnel can directly insert the detection probe into the detection cavity to test the cable insulation layer and conductivity in real time, reducing the cumbersome process of "disassembly of clamp-detection-reinstallation" in traditional maintenance. In addition, combined with the temperature blocking of the plugging piece and the temperature buffering design of the heat insulation outer cover, the formation of the detection cavity is triggered only by overheating of the adjacent cable body, improving the detection accuracy and thereby improving the operation and maintenance efficiency of the photovoltaic power generation system. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0021] Figure 2 It is a schematic diagram of the internal structure of the electrical appliance structure mounting cavity of the present application;

[0022] Figure 3 It is a schematic diagram of the A structure of the present application; Figure 2

[0023] Figure 4 It is a front view of the cabinet body of the present application;​

[0024] Figure 5 Figure is the schematic diagram of the body misalignment installation structure of the invention;

[0025] Figure 6 Figure is the schematic diagram of the fastening piece heat deformation process of the invention;

[0026] Figure 7 Figure is the schematic diagram of the detection cavity forming structure of the invention;

[0027] Figure 8 Figure is the schematic diagram of the fastening piece installation structure of the invention;

[0028] Figure 9 Figure is the schematic diagram of the structure at B of the invention; Figure 8

[0029] Figure 10 Figure is the schematic diagram of the lateral limiting block structure of the invention.

[0030] The meanings of various numbers in the figures are as follows:

[0031] 1, cable cabinet body; 11, cabinet body; 12, cabinet door; 13, electrical structure installation cavity; 14, inner plate; 15, electrical element; 16, cable body;

[0032] 2, wire fixing structure; 21, wire fixing body; 211, lateral limiting block; 212, cable clamping cavity; 213, front end base; 214, fastening piece; 215, groove;

[0033] 22, plugging piece; 23, heat collecting piece; 231, convex point structure; 24, heat insulation coating; 25, resistance reducing angle; 26, deformation indication mark;

[0034] 3, detection cavity;

[0035] 4, heat insulation outer covering block; 41, temperature buffering cavity. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the invention will be described clearly and completely below with the accompanying drawings in the embodiments of the invention. Obviously, the described embodiments are only some of the embodiments of the invention, but not all the embodiments. Based on the embodiments in the invention, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the invention.

[0037] The invention provides a cable cabinet for photovoltaic power generation system convenient for maintenance, which is shown in Figures 1-3 ​As shown, the cable cabinet body 1 includes a cabinet 11. An electrical structure mounting cavity 13 is formed inside the cabinet 11. A cabinet door 12 is rotatably provided at the opening of the electrical structure mounting cavity 13. An inner plate 14 is fixedly installed inside the electrical structure mounting cavity 13. Multiple electrical components 15 are installed on the surface of the inner plate 14. The multiple electrical components 15 are connected to each other through a cable body 16.

[0038] The inner plate 14 has multiple cable fixing structures 2 on its surface. Each cable fixing structure 2 includes multiple cable fixing bodies 21. The multiple cable fixing bodies 21 are arranged with auxiliary cable bodies 16 on the surface of the inner plate 14, and adjacent cable fixing bodies 21 are staggered.

[0039] When a fault occurs and the cable body 16 heats up, the sealing part of the cable fastener body 21 will deform due to the heat, visually alerting maintenance personnel. During this process, a detection cavity 3 will be formed between the cable fastener body 21 and the cable body 16.

[0040] The cable connected between the electrical components 15 needs to be fixed to the surface of the inner plate 14 by the cable clamp body 21. The specific structure of the cable clamp body 21 is disclosed below. The cable clamp body 21 includes two lateral limiting blocks 211. Both lateral limiting blocks 211 are installed on the surface of the inner plate 14 by bolts. The two lateral limiting blocks 211 are mirror images. The side ends of the two lateral limiting blocks 211 away from the inner plate 14 are fixedly connected to the front end base 213. The two front end bases 213 and the two lateral limiting blocks 211 form a cable clamp cavity 212.

[0041] The cable holder body 21 consists of two lateral limiting blocks 211, both of which are fixed to the surface of the inner plate 14 by bolts. The two lateral limiting blocks 211 are distributed in a mirror-symmetrical manner. Figure 3 As shown, each lateral limiting block 211 is fixedly connected to the front base 213 at the end away from the inner plate 14. The two front bases 213 and the lateral limiting blocks 211 together form a cable clamp cavity 212, which can accommodate the installation requirements of single or multiple cable bodies 16. The specific configuration can be set according to the requirements. The lateral limiting blocks 211 are connected to the inner plate 14 by bolts. The installation position can be adjusted according to the wiring layout inside the cable cabinet body 1 to meet the fixing requirements of cable bodies 16 in different areas. The mirror structure ensures that the constraint force on the cable on both sides of the cable clamp cavity 212 is balanced, avoiding deformation or insulation wear of the cable body 16 due to uneven force. The semi-enclosed clamp space formed by the front base 213 and the lateral limiting blocks 211 restricts the cable body 16 within the preset wiring path. (See reference...) Figure 4As can be seen, when the plurality of fixed-wire bodies 21 are installed on the surface of the inner plate 14 in a staggered manner, the cable bodies 16 can be arranged in a matrix or S-shaped manner, so that the layout of the lines in the cable cabinet body 1 is regular and neat, and a clear physical path reference is provided for subsequent maintenance of the cable body 16 failure.

[0042] Two lateral limiting blocks 211 are provided with grooves 215 away from the side of the inner plate 14, and a fastening sheet 214 is arranged between the two lateral limiting blocks 211. The fastening sheet 214 is in a U-shaped structure, the protruding end of the fastening sheet 214 is in an A direction, and the open end of the fastening sheet 214 is in a B direction. The A direction face of the fastening sheet 214 is attached to the surface of the cable body 16, and the two lateral limiting blocks 211 cooperate to fix and arrange the cable body 16. The B direction face of the fastening sheet 214 is located inside the two grooves 215.

[0043] In combination Figure 5 As shown in the figure, the two lateral limiting blocks 211 are provided with grooves 215 away from the side of the inner plate 14, and the grooves 215 extend along the width direction of the lateral limiting blocks 211. The cross-sectional shape of the grooves 215 matches the profile of the B direction end of the fastening sheet 214, and the width of the grooves 215 is slightly wider than the width of the fastening sheet 214, providing space for the deformation of the fastening sheet 214. The fastening sheet 214 is in a U-shaped structure, the protruding A direction face directly attaches to the surface of the cable body 16, and the two B direction end portions are correspondingly embedded in the two grooves 215. The U-shaped opening direction is B direction, and the protruding end is A direction. The A direction face of the fastening sheet 214 forms a surface contact with the surface of the cable, and the B direction face realizes longitudinal limiting through the grooves 215, and cooperates with the two lateral limiting blocks 211 to form a clamping space for the cable. In this structure, the U-shaped structure of the fastening sheet 214 is attached to the surface of the cable through the A direction face, and forms a three-point clamping with the two lateral limiting blocks 211, thereby enhancing the fixing strength of the cable. The grooves 215 limit the B direction end portion of the fastening sheet 214 to ensure the stability of the clamping structure.

[0044] The fastening sheet 214 is made of a memory metal material.

[0045] The reason why heat is generated when the cable body 16 is damaged is that when the cable body 16 has faults such as short circuit, open circuit, overload, and aging and damage of the insulation layer, the internal current transmission path is abnormal. Short circuit or overload leads to a sharp increase in current. According to Joule's law, the increase in current causes a large amount of Joule heat to be generated in the cable conductor. The open circuit fault may cause arc discharge, and the instantaneous high temperature of the arc can reach several thousand degrees Celsius. When the current passes through, concentrated heat is generated, causing the surface temperature of the cable body 16 to rise rapidly.

[0046] The fastening piece 214 is made of a shape memory metal material (such as nickel-titanium alloy), and the heat bending principle is based on the phase change characteristics of the shape memory alloy: at room temperature, the shape memory metal is in the martensite phase and has good plasticity and can be easily deformed into a U shape; when the cable body 16 is abnormally heated (the temperature exceeds the austenite phase transition starting temperature Af of the shape memory metal, such as 70 DEG C), the shape memory metal absorbs heat to trigger phase transition and gradually changes into the rigid austenite phase, at this time, the material will "remember" the original shape (straight plate shape) at high temperature, and generate a restoring force;

[0047] In the specific process, in combination with Figure 6 As shown in the figure, the heat generated by the damage of the cable body 16 is conducted to the A surface of the fastening piece 214, and after the temperature exceeds Af, the internal crystal structure of the shape memory metal is reorganized, and the atomic arrangement is changed from the disordered martensite phase to the ordered austenite phase, accompanied by volume expansion and shape recovery, the two side arms of the U-shaped fastening piece 214 are bent to the opening end (B surface) under the action of the restoring force, and gradually flattened into a straight plate, in this process, the A surface is separated from the cable surface, and a visual deformation is formed, that is, the original U-shaped structure that is attached to the cable body 16 disappears and becomes a straight plate parallel to the groove 215, as shown in Figure 7 The maintenance personnel can judge that the cable body 16 in this area has an overheating reaction and needs to be checked by observing the shape change of the fastening piece 214;

[0048] At the same time, the detection cavity 3 is automatically formed between the deformed fastening piece 214 and the cable body 16, at this time, the maintenance personnel do not need to disassemble the cable fixing device body 21, and can directly insert the detection probe into the detection cavity 3, and use the physical gap generated after the phase change of the shape memory metal to test the cable insulation layer and the conductivity in real time, and the tedious process of "disassembling the clamp-detecting-reinstalling" in the traditional maintenance is omitted. The closed-loop mechanism of "temperature triggering-phase change-deformation-gap generation-direct detection" not only realizes visual positioning of the fault through the shape change of the shape memory metal, but also optimizes the maintenance process by using the physical space generated by the phase change, thereby shortening the single fault checking time.

[0049] Since the B end of the fastening piece 214 is embedded in the groove 215, if the opening of the groove 215 is not constrained, the fastening piece 214 may be longitudinally separated from the groove 215 under the vibration of the cable cabinet body 1 or the action of external force, resulting in fixation failure, and at the same time, the heat generated by other cable bodies 16 or electrical elements 15 in the cable cabinet body 1 may be conducted to the fastening piece 214 from the B surface, which may trigger the deformation, therefore, the opening of the two grooves 215 is provided with a blocking piece 22, the blocking piece 22 is used for longitudinally limiting the fastening piece 214, and the blocking piece 22 can block the temperature sensing of the B surface of the fastening piece 214.

[0050] The improvement lies in that the shape memory metal is further combined with Figure 10As shown, the openings of the two grooves 215 are each mounted with a blocking piece 22 which is fixed in the opening end of the groove 215 by clamping and has an inner profile which is fitted with the profile of the upper end of the fastening piece 214 in the B direction to form a longitudinal limiting structure, which can reduce the disengagement of the fastening piece 214 from the groove 215 in the non-fault state and ensure the stability of the clamping structure. Meanwhile, the blocking piece 22 is made of heat insulation material (such as ceramic or asbestos) and has a thickness which matches the heat insulation performance of the common heat source temperature in the cable body 1. The blocking piece 22 blocks the top opening of the groove 215 to reduce the misdeformation of the fastening piece 214 caused by the heat generated by the adjacent cable body 16 or electrical element 15.

[0051] At room temperature, the B end of the fastening piece 214 is embedded in the groove 215, the width of the groove 215 is slightly larger than the thickness of the fastening piece 214, and the B end of the fastening piece 214 is longitudinally limited by the blocking piece 22, but the B end of the fastening piece 214 is allowed to slide in the length direction (i.e. parallel to the axial direction of the cable body 16) in the groove 215. When the temperature exceeds the austenite phase transition starting temperature Af of the memory metal, the restoring force of the two arms makes the overall structure of the fastening piece 214 stretch towards the opening end in the B direction when the fastening piece 214 restores from the U shape to the straight plate shape. At this time, the B end of the fastening piece 214 slides in the groove 215, and the sliding distance is determined by the difference between the initial curvature of the U-shaped structure and the length of the straight plate shape (usually 2-5 mm). Since the length of the groove 215 is designed to reserve the sliding space, and the inner profile of the blocking piece 22 is fitted with the outer profile of the B end of the fastening piece 214 but does not limit the axial sliding, the B end always remains in the groove 215 during the sliding process, neither longitudinally limited nor hindered the shape restoration of the fastening piece 214.

[0052] Since the heat needs to be efficiently conducted to the fastening piece 214 to trigger the phase transition when the surface of the cable body 16 is overheated, the side surface of the A face of the fastening piece 214 close to the cable body 16 is paved with a heat collecting piece 23, and the outer wall of the heat collecting piece 23 is in a convex point structure 231.

[0053] Referring to Figure 8 As shown, the side surface of the A face of the fastening piece 214 close to the cable body 16 is paved with a heat collecting piece 23, and the heat collecting piece 23 is made of high thermal conductivity metal (such as copper or aluminum) and has a thickness of 0.5-1 mm. The outer wall is processed into a dense convex point structure 231, the diameter of a single convex point is 0.3-0.5 mm, the height is 0.2-0.3 mm, the distance between adjacent convex points is 0.5-1 mm, the convex point structure 231 increases the contact area with the surface of the cable body 16, and part of the convex points can be embedded in the micro concave of the outer sheath of the cable body 16 to reduce the air gap thermal resistance, and the overall structure of the heat collecting piece 23 enhances the continuity of the heat conduction path.

[0054] Specifically, the convex structure 231 of the heat collecting sheet 23 increases the actual contact area with the surface of the cable body 16 to more than 3 times that of flat contact, and reduces the thermal resistance by 40%-50%. Tests have shown that when the cable temperature reaches 70℃ (the Af temperature of nickel-titanium alloy), the heat collecting sheet 23 can quickly heat the fastening sheet 214 to the phase transition temperature, triggering the deformation indication. In addition, the convex structure 231 forms micro-pressure points on the surface of the cable body 16, enhancing the stability of the fit between the heat collecting sheet 23 and the cable body 16. Even if the cable body 16 is slightly displaced due to vibration, the convex points can still maintain effective contact, ensuring the continuity of heat conduction and improving the fault warning capability.

[0055] When receiving heat from the cable body 16, the fastening sheet 214 needs to ensure that heat is only conducted from the heat collecting sheet 23 on the A-side surface into it, avoiding environmental heat in other directions interfering with its phase transition triggering condition. However, there are various heat sources inside the cable cabinet body 1, such as the heat generated by the operation of the electrical components 15 and the heat conduction of adjacent cable bodies 16. If the non-detection surface of the fastening sheet 214 (i.e. the side of the A-side surface away from the heat collecting sheet 23) is directly exposed, it may cause the fastening sheet 214 to deform prematurely due to the accumulation of environmental heat, resulting in false alarms. Therefore, the surface of the side of the A-side surface of the fastening sheet 214 away from the heat collecting sheet 23 is coated with a thermal insulation coating 24.

[0056] The improvement is that: Figure 9 and Figure 10 The surface of the side of the A-side surface of the fastening sheet 214 away from the heat collecting sheet 23 is coated with a thermal insulation coating 24. The thermal insulation coating 24 uses nano aerogel or ceramic fiber composite paint, and the coating thickness is controlled at 0.1-0.3mm. The coating is uniformly covered by spraying or brushing process to form a continuous thermal insulation barrier, effectively blocking the environmental heat from the non-detection surface of the fastening sheet 214 and maintaining the reliability of the detection function.

[0057] When the fastening sheet 214 is heated to undergo phase transition, it needs to change from a U-shaped structure to a straight plate shape, and the B-end portion will slide in the length direction in the groove 215. The traditional straight opening groove 215 may hinder the smooth sliding of the fastening sheet 214 due to stress concentration. Therefore, a resistance-reducing angle 25 is provided at the opening of each groove 215, and the resistance-reducing angle 25 is a smooth structure.

[0058] As shown in Figure 9As shown, the opening of each of the two grooves 215 is provided with a resistance-reducing angle 25, which is formed by a smooth transition structure. The right-angle edge at the opening of the groove 215 is converted into an arc surface through machining or mold forming process. The smooth structure of the resistance-reducing angle 25 reduces the frictional resistance when the B-direction end of the fastening sheet 214 slides in the groove 215 during thermal deformation. At the same time, the resistance-reducing angle 25 eliminates the stress concentration point at the opening of the groove 215, effectively reducing the metal fatigue or fracture caused by excessive stress, ensuring that the fastening sheet 214 can smoothly complete the deformation at the set temperature (exceeding Af), and further improving the maintenance efficiency of the photovoltaic power generation system.

[0059] The two side limiting blocks 211 are provided with deformation indication marks 26 on the side surface close to the cable clamp cavity 212.

[0060] Referring to Figure 6 and combining Figure 9 As shown, the two side limiting blocks 211 are provided with deformation indication marks 26 composed of a plurality of parallel scale lines on the side surface close to the cable clamp cavity 212. The deformation indication marks 26 are fixed on the surface of the side limiting block 211 through laser etching process. When the fastening sheet 214 is in the initial U-shaped state, the edge thereof is aligned with one of the scale lines. As the fastening sheet 214 is gradually flattened by heat, the edge position moves corresponding to different scale lines, converting the deformation degree into a visual scale reference. Maintenance personnel can quickly judge the degree of cable overheating by observing the relative position of the edge of the fastening sheet 214 and the deformation indication marks 26, thereby improving the troubleshooting efficiency inside the cable cabinet body 1.

[0061] The two side limiting blocks 211 are provided with deformation indication marks 26 on the side surface close to the cable clamp cavity 212.

[0062] The improvement lies in that Figure 6 , the two side limiting blocks 211 are provided with deformation indication marks 26 on the side surface close to the cable clamp cavity 212. The two side limiting blocks 211 are provided with deformation indication marks 26 composed of a plurality of parallel scale lines on the side surface close to the cable clamp cavity 212. The deformation indication marks 26 are fixed on the surface of the side limiting block 211 through laser etching process. When the fastening sheet 214 is in the initial U-shaped state, the edge thereof is aligned with one of the scale lines. As the fastening sheet 214 is gradually flattened by heat, the edge position moves corresponding to different scale lines, converting the deformation degree into a visual scale reference. Maintenance personnel can quickly judge the degree of cable overheating by observing the relative position of the edge of the fastening sheet 214 and the deformation indication marks 26, thereby improving the troubleshooting efficiency inside the cable cabinet body 1.

[0063] Working principle:

[0064] Firstly, the fixed-wire body 21 is composed of two mirror-symmetrical lateral limiting blocks 211 and a front end base 213 to form a cable clamp cavity 212, so as to fix the cable body 16 in a preset path, and the installation position can be adjusted according to the line layout of the cable cabinet body 1; when the cable body 16 has a short circuit, an open circuit, an overload and the like, internal current abnormality causes a large amount of Joule heat or arc high temperature of the conductor, and the surface temperature rapidly rises;

[0065] The heat is conducted to the heat collecting piece 23 through the A-direction face of the fastening piece 214, the convex point structure 231 of the heat collecting piece 23 increases the contact area and reduces the thermal resistance, so that the heat is efficiently transmitted to the fastening piece 214; the fastening piece 214 is made of a memory metal material, when the temperature exceeds the austenite phase transition starting temperature Af, the internal crystal structure is converted from the martensite phase to the austenite phase, and a restoring force drives the U-shaped structure to be converted into a straight plate shape; in this process, the B-direction end part of the fastening piece 214 slides in the groove 215, the blocking piece 22 longitudinally limits the B-direction end part and blocks external heat interference, and prevents false triggering;

[0066] After the deformation of the fastening piece 214, a detection cavity 3 is formed between the fastening piece 214 and the cable body 16, a probe can be directly inserted by a maintenance personnel to detect the cable insulation layer and the conductivity, in addition, the heat insulation outer cover block 4 outside the lateral limiting block 211, the slow temperature cavity 41 and the heat insulation coating 24 on the non-detection surface of the fastening piece 214 jointly block the environmental heat conduction, so as to ensure that the fastening piece 214 only responds to the abnormal temperature of the cable body 16, and realize the closed-loop fault detection and maintenance process of “temperature triggering-phase change-deformation-gap generation-direct indication-direct detection”.

[0067] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application, and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A cable cabinet for photovoltaic power generation system facilitating maintenance, comprising a cable cabinet body (1), the cable cabinet body (1) comprising a cabinet body (11), the inside of the cabinet body (11) forming an electrical structure mounting cavity (13), and a cabinet door (12) being rotatably arranged at the opening of the electrical structure mounting cavity (13), characterized in that: an inner plate (14) is fixedly arranged in the electrical structure mounting cavity (13), and a plurality of electrical elements (15) are arranged on the surface of the inner plate (14); the plurality of electrical elements (15) are connected by a cable body (16); a plurality of wire fixing structures (2) are arranged on the surface of the inner plate (14), and each wire fixing structure (2) comprises a plurality of wire fixing bodies (21) which are arranged on the surface of the inner plate (14) to assist the arrangement of the cable body (16), and adjacent wire fixing bodies (21) are arranged in a staggered manner; when the cable body (16) fails and is heated, the wire fixing bodies (21) will be deformed due to the heat, thereby visually warning the maintenance personnel, and in the process, a detection cavity (3) is formed between the wire fixing bodies (21) and the cable body (16); each wire fixing body (21) comprises two lateral limiting blocks (211), the two lateral limiting blocks (211) are both fixedly arranged on the surface of the inner plate (14) by bolts, the two lateral limiting blocks (211) are mirror images, the side ends of the two lateral limiting blocks (211) away from the inner plate (14) are both fixedly connected with front end bases (213), and the two front end bases (213) combine the two lateral limiting blocks (211) to form a cable clamping cavity (212); a heat insulation outer block (4) is fixedly arranged on the outer wall of the side of each lateral limiting block (211) away from the cable clamping cavity (212), and the heat insulation outer block (4) and the adjacent lateral limiting block (211) form a temperature buffering cavity (41). Each lateral limiting block (211) is provided with a groove (215) on the side thereof away from the inner plate (14), and a fastening piece (214) is arranged between the two lateral limiting blocks (211), the fastening piece (214) is in a U-shaped structure, the protruding end of the fastening piece (214) is in an A direction, the opening end of the fastening piece (214) is in a B direction, the A direction surface of the fastening piece (214) is attached to the surface of the cable body (16) to fix and arrange the cable body (16) in cooperation with the two lateral limiting blocks (211), and the B direction surface of the fastening piece (214) is located in the two grooves (215). The fastening piece (214) is made of a memory metal material. A blocking piece (22) is arranged at the opening of each groove (215), the blocking piece (22) is used for limiting the fastening piece (214) in the longitudinal direction, and the blocking piece (22) can block the temperature sensing of the fastening piece (214) in the B direction. ​ ​ 2. The cable cabinet for photovoltaic power generation system for easy maintenance according to claim 1, characterized in that: ​ 3. The cable cabinet for photovoltaic power generation system with easy maintenance according to claim 2, characterized in that: ​ 4. The cable cabinet for photovoltaic power generation system for easy maintenance according to claim 2, characterized by: ​ 5. The cable cabinet for photovoltaic power generation system for easy maintenance according to claim 2, characterized in that: The A-direction surface of the fastening sheet (214) close to the side surface of the cable body (16) is paved with a heat collecting sheet (23), and the outer wall of the heat collecting sheet (23) is in a convex point structure (231).

6. The cable cabinet for photovoltaic power generation system for easy maintenance according to claim 5, characterized in that: The side surface of the fastening sheet (214) away from the heat collecting sheet (23) is coated with a heat insulation coating (24).

7. The cable cabinet for photovoltaic power generation system for easy maintenance according to claim 2, characterized by: The opening of each of the two grooves (215) is provided with a resistance reducing angle (25), and the resistance reducing angle (25) is in a smooth structure.

8. The cable cabinet for photovoltaic power generation system for easy maintenance according to claim 2, characterized in that: The side surface of each of the two lateral limiting blocks (211) close to the cable clamping cavity (212) is provided with a deformation indication mark (26) for prompting the deformation degree of the fastening sheet (214).

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