Photoelectric DC cable safety monitoring system

Abstract

The utility model relates to a cable safety monitoring system, belongs to the technical field of photovoltaic power generation system safety monitoring, and particularly relates to a photoelectric direct current cable safety monitoring system. The system comprises a monitoring terminal body, a gateway controller, a string monitoring terminal, a drive-by-wire air switch, a photovoltaic panel string group and the like. Through linkage of the slide bar, the slide block, the spring column and the adjustable clamp, rapid installation and multi-specification self-adaptive fixation of the DC cable are realized. The protection and maintenance efficiency is improved through cooperation of the magnetic shielding part and the limiting groove; by means of system integration equipment, real-time monitoring of the operation state, timely alarm processing of faults and remote monitoring are achieved. According to the utility model, the effects of improving the installation stability of the photovoltaic DC cable, enhancing the protection effect and realizing efficient monitoring and response are achieved, and the problems of unstable installation and fixation, insufficient protection and state monitoring lagging of the photovoltaic DC cable are solved.

Description

Technical Field

[0001] This utility model relates to the field of safety monitoring technology for photovoltaic power generation systems, and in particular to a safety monitoring system for photovoltaic DC cables. Background Technology

[0002] In the field of photovoltaic power generation system safety monitoring, the installation, protection, and monitoring of DC power cables are crucial for the stable and efficient operation of the system. However, current technologies have significant shortcomings.

[0003] Poor cable fixing compatibility: Traditional clamps have limited specifications and are difficult to adapt to the diverse DC cable diameters in photovoltaic power plants. Frequent clamp replacements during operation and maintenance are cumbersome and greatly reduce installation efficiency. If the clamps are mismatched, being too loose will cause cable slippage, increased contact resistance leading to localized overheating; being too tight will damage the insulation layer and increase the risk of leakage.

[0004] Low protection and maintenance efficiency: Existing protective devices are mostly bolted, and cable inspection and troubleshooting require special tools for disassembly, which is time-consuming and labor-intensive. In addition, the protective components are separated from the clamps, which can easily leave gaps, allowing dust and rainwater to enter and accelerate cable corrosion.

[0005] Monitoring and response lag: Existing systems struggle to detect potential hazards such as poor wire contact and leakage in a timely manner, and lack real-time feedback and remote control capabilities. Fault handling relies on manual on-site operations, resulting in low maintenance efficiency and a high risk of fault propagation.

[0006] Therefore, a safety monitoring system for photoelectric DC cables is proposed. Utility Model Content

[0007] To address the aforementioned technical problems, this utility model proposes a photoelectric DC cable safety monitoring system.

[0008] The technical solution to achieve the purpose of this utility model is: a photoelectric DC cable safety monitoring system, comprising:

[0009] The monitoring terminal body has a pair of concave mounting brackets with openings facing forward at the bottom. The inner side of the mounting brackets is provided with a sliding groove, guide rail assembly, clamp component and shielding component.

[0010] The gateway controller, installed at the inverter end, has a built-in power module and sensors to collect electrical parameters of the inverter's junction circuit.

[0011] A string monitoring terminal, integrated within the monitoring terminal body, includes a LoRa communication module and a power supply, used to monitor the electrical parameters of the photovoltaic panel string and communicate with the gateway controller via the LoRa wireless network;

[0012] The wired circuit breaker is electrically connected to the string monitoring terminal through a cable interface and is controlled by the terminal to disconnect or close the string power supply.

[0013] The photovoltaic panel string is connected to the line-controlled circuit breaker via DC cables;

[0014] The LoRa communication module of the string monitoring terminal includes an antenna structure, and the gateway controller is connected to the system platform through a communication interface.

[0015] Preferably, the guide rail assembly includes a slide rod inside the slide groove, a spring post sleeved on the slide rod, and a clamping component including an upper limit ring at the top of the inner side of the mounting bracket and a lower limit ring below the upper limit ring. The upper limit ring and the lower limit ring form a circle. A slider is connected to one side of the lower limit ring, and the slider is slidably sleeved on the slide rod. Threaded holes are provided at the front end protrusions of both the upper limit ring and the lower limit ring. A fixing bolt and a nut are threadedly connected to the front end of both the upper limit ring and the lower limit ring.

[0016] Preferably, the top of the monitoring terminal body is equipped with a rain cover that is narrower at the top and wider at the bottom.

[0017] Preferably, the shielding component includes a first magnetic absorbing piece connecting the front and rear sides of the monitoring terminal body and two sets of second shielding pieces on the mounting brackets that are far apart from each other. The first magnetic absorbing piece is arranged in a row on the front and rear sides of the monitoring terminal body, and two sets of second shielding pieces are arranged on each side of the monitoring terminal body. The front and rear sides of the mounting brackets are vertically shielded downward by the first magnetic absorbing piece and the second shielding piece. The top of the first magnetic absorbing piece and the second shielding piece are connected to the side of the monitoring terminal body.

[0018] Preferably, a semi-circular limiting groove is provided between each pair of second shielding plates, and the DC cable passes through the two limiting grooves on both sides of the mounting bracket.

[0019] Preferably, both the first magnetic attracting sheet and the second shielding sheet are made of insulating strip structure.

[0020] Preferably, the gateway controller includes a fixed bracket and a data acquisition interface. The fixed bracket is bolted to the inverter housing, and the data acquisition interface is electrically connected to the inverter junction circuit.

[0021] Preferably, the antenna structure of the LoRa communication module is located on the top of the monitoring terminal body and is insulated from the rain cover.

[0022] Preferably, the cable interface of the wired circuit breaker is a waterproof plug-in terminal, located on the side of the monitoring terminal body.

[0023] Preferably, the system platform issues commands through the communication interface of the gateway controller, which is an RS485 or Ethernet port.

[0024] Compared with existing technologies, the significant advantages of this invention are:

[0025] Firstly, this utility model achieves rapid installation and adaptive fixing of DC cables across multiple specifications through a linkage structure of a sliding rod, a slider, a spring column, and an adjustable clamp. The sliding rod and the sliding groove form a vertical guide, and the elastic preload of the spring column allows the lower limit ring to automatically rise and fall along the sliding rod, dynamically adapting to DC cables of different thicknesses. The upper and lower limit rings achieve double fixing through a threaded locking mechanism, with the spring column providing elastic clamping and the nut achieving mechanical locking. Compared to traditional clamps, cables can be securely fixed without frequent changes in specifications, making installation and disassembly more convenient.

[0026] Secondly, this utility model achieves a dual improvement in protective performance and maintenance convenience through the coordinated layout of the magnetic shielding component and the limiting groove. The first magnetic plate and the second shielding plate are magnetically joined to form a full-range shield for the mounting bracket, preventing dust and debris from entering, and disassembly and maintenance require no tools; the semi-circular limiting groove and the clamping component work together to limit the horizontal deviation of the DC cable and ensure connection stability; compared with traditional protective covers, cable positioning is more accurate, and maintenance time is significantly shortened.

[0027] Thirdly, this system comprises hardware and software devices such as an inverter gateway controller, string monitoring terminals, wired circuit breakers, and a system platform, offering significant advantages. The gateway controller, installed at the inverter end, can collect electrical parameters of each junction circuit in real time. The string monitoring terminal monitors the electrical parameters of the photovoltaic panel strings in real time and transmits them wirelessly to the gateway controller via LoRa, enabling comprehensive and real-time monitoring of the system's operating status. When potential hazards such as poor contact or leakage between the gateway controller and string monitoring terminals are detected, tiered remote warnings can be issued, greatly improving the timeliness of hazard detection. Regarding fault handling, in the event of a short circuit between the positive and negative terminals, an alarm message can be immediately issued, and the power supply to the affected string line can be automatically disconnected, effectively preventing the fault from escalating. The system platform can receive data and warning messages reported by the gateway controller and can also issue circuit breaker control commands. Through the system platform or authorized mobile terminals, designated circuit breakers can be remotely disconnected at any time, enabling remote monitoring and operation. This allows maintenance personnel to manage the system anytime, anywhere, improving maintenance efficiency and ensuring the stable and safe operation of the photovoltaic system. Attached Figure Description

[0028] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0029] Figure 1 This is a diagram of a photoelectric DC cable safety monitoring system provided in one embodiment of the present invention;

[0030] Figure 2 This is a three-dimensional structural diagram of the detection device provided in one embodiment of the present invention;

[0031] Figure 3This is a side sectional view of the detection device provided in one embodiment of the present invention;

[0032] Figure 4 This is a half-section three-dimensional structural diagram of the detection device provided in one embodiment of the present invention;

[0033] Figure 5 This is a three-dimensional structural diagram of the detection device provided in one embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Monitoring terminal body; 101. Rain cover; 2. Mounting bracket; 201. Slide groove; 3. Upper limit ring; 4. Lower limit ring; 401. Slider; 402. Fixing bolt; 403. Nut; 5. Slide rod; 501. Spring column; 6. First magnetic suction piece; 601. Second shielding piece; 602. Limiting groove. Detailed Implementation

[0036] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0037] This utility model provides an improved photoelectric DC cable safety monitoring system. The technical solution of this utility model is as follows:

[0038] Figures 1-5 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-5 The present invention will be further described below.

[0039] like Figures 1-5 As shown, a photovoltaic DC cable safety monitoring system includes a monitoring terminal body 1, with a pair of forward-facing concave mounting brackets 2 at its bottom. The mounting brackets 2 have a sliding groove 201, a guide rail assembly, a clamping component, and a shielding component on their inner sides. A gateway controller, installed at the inverter end, has a built-in power module and sensors for collecting electrical parameters of the inverter's junction circuit. A string monitoring terminal, integrated within the monitoring terminal body 1, includes a LoRa communication module and a power supply for monitoring the electrical parameters of the photovoltaic panel string and communicating with the gateway controller via a LoRa wireless network. A wired circuit breaker is electrically connected to the string monitoring terminal via a cable interface and is controlled by the terminal to disconnect or close the string power supply. A photovoltaic panel string is connected to the wired circuit breaker via a DC cable. The LoRa communication module of the string monitoring terminal includes an antenna structure, and the gateway controller is connected to the system platform via a communication interface.

[0040] In one embodiment, the guide rail assembly includes a slide rod 5 inside the slide groove 201, a spring post 501 sleeved on the slide rod 5, and a clamping component including an upper limit ring 3 connected to the top of the inner side of the mounting bracket 2 and a lower limit ring 4 below the upper limit ring 3. The upper limit ring 3 and the lower limit ring 4 form a circle. A slider 401 is connected to one side of the lower limit ring 4. The slider 401 is slidably sleeved on the rod of the slide rod 5. Threaded holes are provided at the front end protrusions of both the upper limit ring 3 and the lower limit ring 4. The front ends of the upper limit ring 3 and the lower limit ring 4 are threadedly connected to a fixing bolt 402 and a nut 403. By configuring the upper limit ring 3, lower limit ring 4, fixing bolt 402, nut 403, slide rod 5, slider 401, and spring post 501, the distance between the upper limit ring 3 and the lower limit ring 4 is reduced by tightening the nut 403 on the fixing bolt 402, thereby firmly clamping the DC cable. Furthermore, the spring post 501, in conjunction with the slider 401, slides on the slide rod 5, which can accommodate DC cables of different thicknesses, increasing the applicability of the device and making the installation and removal of DC cables more convenient.

[0041] In one embodiment, a rain cover 101, narrow at the top and wide at the bottom, is installed on the top of the monitoring terminal body 1. The rain cover 101 provides rain protection for the monitoring terminal body 1, preventing rainwater from entering the interior and protecting internal electronic components such as the serial monitoring terminal, thereby extending the equipment's lifespan.

[0042] In one embodiment, the shielding component includes a first magnetic clasp 6 connecting the front and rear sides of the monitoring terminal body 1 and two sets of second shielding plates 601 positioned away from each other on the mounting brackets 2. A row of first magnetic clasp 6 is arranged horizontally on the front and rear sides of the monitoring terminal body 1, and two sets of second shielding plates 601 are arranged on each side of the monitoring terminal body 1. The first magnetic clasp 6 and the second shielding plates 601 vertically shield the front and rear sides of the mounting brackets 2 downwards. The tops of the first magnetic clasp 6 and the second shielding plates 601 are connected to the sides of the monitoring terminal body 1. The arrangement of the first magnetic clasp 6 and the second shielding plates 601 achieves shielding and protection of the front and rear sides of the mounting brackets 2, preventing dust, debris, etc., from entering the mounting brackets 2 and affecting the installation and use of the DC cable. Simultaneously, the magnetic connection facilitates the installation and removal of the second shielding plates 601.

[0043] In one embodiment, a semi-circular limiting groove 602 is provided between every two sets of second shielding plates 601, and the DC cable passes between the two limiting grooves 602 on both sides of the mounting frame 2. The limiting groove 602 is used to limit the DC cable, making the position of the DC cable more stable within the mounting frame 2, and preventing the DC cable from shaking or shifting and affecting the stability of the connection.

[0044] In one embodiment, both the first magnetic attracting piece 6 and the second shielding piece 601 are made of insulating strip structure. By using the insulating material for the first magnetic attracting piece 6 and the second shielding piece 601, the mounting bracket 2 is protected while ensuring electrical safety and preventing safety accidents such as leakage.

[0045] In one embodiment, the gateway controller includes a mounting bracket and a data acquisition interface. The mounting bracket is bolted to the inverter housing, and the data acquisition interface is electrically connected to the inverter's bus circuit. By using the mounting bracket and data acquisition interface, the gateway controller is securely mounted on the inverter and can accurately acquire the electrical parameters of the inverter's bus circuit, ensuring the stability and accuracy of the data acquisition.

[0046] In one embodiment, the antenna structure of the LoRa communication module is located on the top of the monitoring terminal body 1 and is insulated from the rain cover 101. By setting the antenna structure of the LoRa communication module on the top of the monitoring terminal body 1 and is insulated from the rain cover 101, the antenna structure can be effectively received and transmitted signals, while avoiding the influence of the rain cover 101. Furthermore, the insulation ensures electrical safety.

[0047] In one embodiment, the cable interface of the wired circuit breaker is a waterproof plug-in terminal, located on the side of the monitoring terminal body 1. The waterproof plug-in terminal prevents moisture from entering the connection between the wired circuit breaker and the string monitoring terminal, ensuring the stability and safety of the electrical connection and avoiding short circuits and other malfunctions caused by water ingress.

[0048] In one embodiment, the system platform issues commands through the communication interface of the gateway controller, which is either an RS485 or Ethernet port. By using an RS485 or Ethernet port as the communication interface, the system platform can communicate stably and efficiently with the gateway controller, ensuring accurate transmission of commands and thus achieving effective control of the entire system.

[0049] The working principle and usage process of this utility model are as follows: First, the gateway controller is bolted to the inverter housing via a fixed bracket, and the data acquisition interface is electrically connected to the inverter's junction circuit to collect the electrical parameters of the inverter's junction circuit. The string monitoring terminal is integrated into the monitoring terminal body 1, and wirelessly communicates with the gateway controller via a LoRa communication module to monitor the electrical parameters of the photovoltaic panel string. The wired circuit breaker is electrically connected to the string monitoring terminal via a waterproof connector. The photovoltaic panel string is connected to the wired circuit breaker via a DC cable to achieve the disconnection or closure control of the string power transmission. The DC cable is fixed in the mounting frame 2 by clamping the upper limit ring 3 and the lower limit ring 4. The spacing is adjusted by tightening the thread on the fixing bolt 402 with a nut 403. Simultaneously, the sliding rod 5, the slider 401, and the spring column 501 are used to accommodate cables of different thicknesses. The mounting frame 2 is protected by the first magnetic suction plate 6 and the second shielding plate 601, and the DC cable is limited by passing through the limiting groove 602. The system platform issues commands through the RS485 or Ethernet port communication interface of the gateway controller to monitor and control the entire system.

[0050] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of equivalent substitutions of the above technical features. Matters not covered in this utility model are common knowledge to those skilled in the art.

Claims

1. A safety monitoring system for photoelectric DC cables, characterized in that, include: The monitoring terminal body (1) has a pair of concave mounting brackets (2) with openings facing forward at its bottom. The inner side of the mounting brackets (2) is provided with a sliding groove (201), a guide rail assembly, a clamp component and a shielding component. The gateway controller, installed at the inverter end, has a built-in power module and sensors to collect electrical parameters of the inverter's junction circuit. The string monitoring terminal is integrated into the monitoring terminal body (1), and includes a LoRa communication module and a power supply. It is used to monitor the electrical parameters of the photovoltaic panel string and communicate with the gateway controller through the LoRa wireless network. The wired circuit breaker is electrically connected to the string monitoring terminal through a cable interface and is controlled by the terminal to disconnect or close the string power transmission. The photovoltaic panel string is connected to the line-controlled circuit breaker via DC cables; The LoRa communication module of the string monitoring terminal includes an antenna structure, and the gateway controller is connected to the system platform through a communication interface.

2. The photoelectric DC cable safety monitoring system according to claim 1, characterized in that: The guide rail assembly includes a slide rod (5) inside the slide groove (201), a spring column (501) sleeved on the slide rod (5), and a clamp component including an upper limit ring (3) at the top of the inner side of the connecting mounting bracket (2) and a lower limit ring (4) below the upper limit ring (3). The upper limit ring (3) and the lower limit ring (4) form a circle. A slider (401) is connected to one side of the lower limit ring (4). The slider (401) is slidably sleeved on the rod of the slide rod (5). Threaded holes are opened at the front end protrusions of the upper limit ring (3) and the lower limit ring (4). The front end of the upper limit ring (3) and the lower limit ring (4) are threadedly connected to a fixing bolt (402) and a nut (403).

3. The photoelectric DC cable safety monitoring system according to claim 1, characterized in that: The top of the monitoring terminal body (1) is fitted with a rain cover (101) that is narrow at the top and wide at the bottom.

4. The photoelectric DC cable safety monitoring system according to claim 1, characterized in that: The shielding component includes a first magnetic absorbing piece (6) connecting the front and rear sides of the monitoring terminal body (1) and two sets of second shielding pieces (601) that are far apart from each other on the two sides of the mounting bracket (2). The first magnetic absorbing piece (6) is arranged in a row on the front and rear sides of the monitoring terminal body (1), and two sets of second shielding pieces (601) are arranged on both sides of the monitoring terminal body (1). The front and rear sides of the mounting bracket (2) are vertically shielded downward by the first magnetic absorbing piece (6) and the second shielding piece (601). The top of the first magnetic absorbing piece (6) and the second shielding piece (601) are connected to the side of the monitoring terminal body (1).

5. The photoelectric DC cable safety monitoring system according to claim 4, characterized in that: A semi-circular limiting groove (602) is provided between each pair of second shielding plates (601), and the DC cable passes between the two limiting grooves (602) on both sides of the mounting bracket (2).

6. The photoelectric DC cable safety monitoring system according to claim 5, characterized in that: Both the first magnetic absorbing sheet (6) and the second shielding sheet (601) are made of insulating material strip structure.

7. The system according to claim 1, characterized in that, The gateway controller includes a fixed bracket and a data acquisition interface. The fixed bracket is bolted to the inverter housing, and the data acquisition interface is electrically connected to the inverter junction circuit.

8. The system according to claim 1, characterized in that, The antenna structure of the LoRa communication module is located on the top of the monitoring terminal body (1) and is insulated from the rain cover (101).

9. The system according to claim 1, characterized in that, The cable interface of the wired circuit breaker is a waterproof plug-in terminal, located on the side of the monitoring terminal body (1).

10. The system according to claim 1, characterized in that, The system platform issues commands through the communication interface of the gateway controller, which is either an RS485 or Ethernet port.

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