Novel photovoltaic grid-connected cabinet

Abstract

The utility model discloses a novel photovoltaic grid-connected cabinet, which comprises a grid-connected cabinet shell frame, the grid-connected cabinet shell frame is divided into three main body intervals from top to bottom, the upper end of the grid-connected cabinet shell frame is provided with circuit breaker outer frame placing hole sites at intervals, and the circuit breaker outer frame placing hole sites are provided with frame type circuit breakers. Meanwhile, the grid-connected cabinet shell frame is provided with an anti-islanding device at a position beside the frame-type circuit breaker. The beneficial effects are that the bottom of the grid-connected cabinet housing frame is provided with an external commercial power cable inlet hole position and four cable outlet hole positions, and the grid-connected cabinet housing frame is provided with four groups of photovoltaic butt joint plugs below the plastic housing switch; and each group of photovoltaic butt joint plugs is provided with four paths of cable outlet quick butt joint hole sites, so that the design purpose of incoming and outgoing from the lower part is realized, the safety of the photovoltaic grid-connected cabinet is improved, and meanwhile, a cable pipeline energy mechanical device can be quickly, simply and safely connected and disconnected.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power equipment, specifically to a novel photovoltaic grid-connected cabinet. Background Technology

[0002] The photovoltaic grid-connected cabinet exists as the main outlet of the photovoltaic power station in the photovoltaic system. It is a power distribution device that connects the photovoltaic power station and the power grid. Its main function is to serve as the boundary between the photovoltaic power generation system and the power grid. The photovoltaic grid-connected cabinet can measure the total amount of photovoltaic power generation, has multiple protection devices, facilitates fault inspection and maintenance management, and improves the economic efficiency of the power generation system.

[0003] With the rapid development of photovoltaic power generation technology, the stability and reliability of the connection method of the photovoltaic grid-connected cabinet, as a key piece of equipment in the photovoltaic power generation system, are crucial to the overall system operating efficiency. However, most current photovoltaic grid-connected cabinets use external cables connected from the top of the cabinet, and the internal wire connections also extend from the top to the bottom of the cabinet. This results in high material consumption, and during construction, workers need to build ladders or other means to connect the external cables and internal wires. Furthermore, the internal wires of the photovoltaic grid-connected cabinet are all connected with exposed copper busbars, which is unsafe and prone to electric shock accidents. When the humidity inside the cabinet is high, discharge and tripping may occur. Utility Model Content

[0004] The purpose of this utility model is to provide a new type of photovoltaic grid-connected cabinet to solve the above problems, as detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This utility model provides a novel photovoltaic grid-connected cabinet, including a grid-connected cabinet shell frame. The grid-connected cabinet shell frame is divided into three main sections from top to bottom. The upper end of the grid-connected cabinet shell frame is provided with circuit breaker outer frame placement holes, and a frame-type circuit breaker is installed in the circuit breaker outer frame placement holes. At the same time, an anti-islanding device is installed on the grid-connected cabinet shell frame next to the frame-type circuit breaker.

[0007] An internal observation window is provided at intervals in the middle section of the grid-connected cabinet's outer frame, and a three-phase four-wire metering box is provided next to the internal observation window in the grid-connected cabinet's outer frame. At the same time, a three-phase four-wire energy meter is installed in the three-phase four-wire metering box. Inside the grid-connected cabinet's outer frame, in front of the three-phase four-wire energy meter, a running current transformer and a metering current transformer are respectively provided, and both the running current transformer and the metering current transformer are electrically connected to the frame-type circuit breaker.

[0008] The lower part of the grid-connected cabinet outer frame is equipped with multiple plastic-shell switches, and the grid-connected cabinet outer frame is provided with four sets of photovoltaic docking plugs below the plastic-shell switches.

[0009] Insulating plates are installed horizontally between the various intervals of the grid-connected cabinet outer frame. A grounding bar is installed at the bottom of the lower section of the grid-connected cabinet outer frame. The structural beams on the upper part of the grid-connected cabinet outer frame are respectively equipped with mains power inlet plugs and photovoltaic power inlet plugs. The mains power inlet plug is electrically connected to the isolating knife switch above it via a cable. The isolating knife switch is electrically connected to the metering current transformer via a cable passing through the insulating plate.

[0010] The bottom of the grid-connected cabinet's outer frame is provided with an external mains cable inlet and four cable outlets. The upper part of the external mains cable inlet and the four cable outlets is provided with a docking module.

[0011] Preferably, the front of the grid-connected cabinet's outer frame is equipped with a cabinet door, and the surface of the cabinet door is equipped with a door handle.

[0012] Preferably, a protective shell is installed on the top of the grid-connected cabinet's outer frame.

[0013] Preferably, lead seals are provided on the sides of the frame circuit breaker and the three-phase four-wire metering box.

[0014] Preferably, the inner observation window is provided with two reserved positions for installing electricity meters.

[0015] Preferably, each set of photovoltaic connectors is equipped with four quick-connect cable outlets.

[0016] Preferably, the grid-connected cabinet outer frame is provided with a multi-functional meter hole on the side of the anti-islanding device, and the side of the multi-functional meter hole is provided with a switch opening / closing button hole, an indicator light hole, and a plastic case switch indicator light hole.

[0017] Preferably, the isolating knife switch is provided with an external isolating operating handle that extends outside the outer frame of the grid-connected cabinet.

[0018] Preferably, the bottom of the grid-connected cabinet's outer frame is provided with multiple fixing screw holes.

[0019] Preferably, each cable outlet has four holes.

[0020] In the specific design of this novel photovoltaic grid-connected cabinet, the bottom of the cabinet's outer frame features an external mains cable inlet and four cable outlets. Simultaneously, the outer frame has four sets of photovoltaic connectors below the plastic-cased switch, each with four quick-connect cable outlets. This design achieves bottom-entry / outlet wiring, enhancing the safety of the photovoltaic grid-connected cabinet. It also allows for quick, simple, and safe connection and disconnection of cable conduits via mechanical devices, improving work efficiency. Furthermore, the isolating knife switch has an external isolating operating handle extending outside the cabinet's outer frame, utilizing a lever transmission principle for easy and efficient installation and use by construction personnel, further improving work efficiency. Moreover, the lower part of the cabinet's outer frame utilizes the photovoltaic connectors, enabling the use of... Modular overall design enhances safety, practicality, and protection. The mounting screw holes completely conceal potentially live screws, improving on-site construction efficiency. Furthermore, the grid-connected cabinet's outer frame utilizes a frame-type circuit breaker as the main switch, allowing for manual or electric operation of the energy storage power supply. The multi-functional digital display, installed through the multi-function meter mounting holes, enables remote control of the circuit breaker's opening and closing operations and the transmission of switch status signals via input / output. The grid-connected cabinet's outer frame is equipped with an anti-islanding device, providing anti-islanding protection and improving the photovoltaic grid-connected cabinet's operational stability. Finally, the protective casing at the top of the outer frame provides waterproofing and dustproofing, protecting the internal components from harsh environments.

[0021] The beneficial effects are as follows: 1. The grid-connected cabinet has an external mains cable inlet and four cable outlets at the bottom of its outer frame. At the same time, the grid-connected cabinet has four sets of photovoltaic docking plugs below the plastic-cased switch, and each set of photovoltaic docking plugs has four cable outlet quick docking holes. This achieves the design purpose of entering and exiting the cable from the bottom, improves the safety of the photovoltaic grid-connected cabinet, and enables quick, simple and safe connection and disconnection of cable pipes and mechanical devices, thus improving work efficiency.

[0022] 2. The isolating knife switch is equipped with an external isolating operating handle that extends outside the outer frame of the grid-connected cabinet. It is then operated using the lever transmission principle, which makes it easier for construction personnel to install and use the photovoltaic grid-connected cabinet and improves work efficiency.

[0023] 3. The lower part of the grid-connected cabinet's outer frame adopts a photovoltaic docking plug, which realizes modular overall docking, improves safety and practicality, enhances protection, and completely hides the external exposed screw parts that may be electrified by the fixing screw holes, thus improving the construction efficiency of on-site construction personnel.

[0024] 4. The grid-connected cabinet uses a frame-type circuit breaker as the main switch, which can be manually or electrically operated to control the energy storage power supply. At the same time, by installing a multi-functional digital display meter through the multi-functional meter hole, the remote operation of the frame-type circuit breaker and the remote transmission of switch status signals can be realized through the switch input and output functions.

[0025] 5. The grid-connected cabinet's outer frame is equipped with an anti-islanding device, which provides anti-islanding protection and helps improve the operational stability of the photovoltaic grid-connected cabinet.

[0026] 6. The top of the grid-connected cabinet's outer frame is enclosed with a protective shell, which serves to provide waterproofing and dustproofing, thus protecting the internal components of the grid-connected cabinet's outer frame from the effects of harsh environments. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the main view of this utility model. Figure 1 ;

[0029] Figure 2 This is a schematic diagram of the main view of this utility model. Figure 2 ;

[0030] Figure 3 This is a schematic diagram of the main view of this utility model. Figure 3 ;

[0031] Figure 4 This is a schematic diagram of the main view of this utility model. Figure 4 ;

[0032] Figure 5 This is a left-side view of the present invention;

[0033] Figure 6 This is a partial bottom view of the present invention.

[0034] The annotations in the attached figures are explained as follows:

[0035] 1. Grid-connected cabinet outer frame; 2. Protective housing; 3. Cabinet door; 4. Door handle; 5. Frame-type circuit breaker; 6. Internal observation window; 7. Three-phase four-wire metering box; 8. Three-phase four-wire meter; 9. Molded case switch; 10. Photovoltaic docking plug; 11. Lead seal; 12. Reserved meter position; 13. Cable outlet quick docking hole; 14. Multi-function meter hole; 15. Anti-islanding device; 16. Opening and closing buttons and indicator light holes; 17. Molded case switch indicator light holes; 18. Dock module; 19. Mains power inlet docking plug; 20. Operating current transformer; 21. Structural beam; 22. Photovoltaic power inlet docking plug; 23. Metering current transformer; 24. Insulating board; 25. Disconnecting switch; 26. External isolation operating handle; 27. Grounding bar; 28. Fixing screw holes; 29. ​​External mains cable inlet hole; 30. Cable outlet hole. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] See Figures 1-6As shown, this utility model provides a novel photovoltaic grid-connected cabinet, including a grid-connected cabinet outer frame 1. The grid-connected cabinet outer frame 1 is divided into three main sections from top to bottom. The upper end of the grid-connected cabinet outer frame 1 is provided with circuit breaker frame placement holes, and a frame-type circuit breaker 5 is installed in the circuit breaker frame placement holes. At the same time, an anti-islanding device 15 is installed next to the frame-type circuit breaker 5 on the grid-connected cabinet outer frame 1. The purpose of this arrangement is that, firstly, the frame-type circuit breaker 5 is used as the main switch, which can be manually or electrically operated to control the energy storage power supply. Moreover, the frame-type circuit breaker 5 can connect, carry, and disconnect the current under normal circuit conditions, and can also connect, carry, and disconnect the current for a certain time under specified abnormal circuit conditions. It is mainly used to distribute electrical energy and protect the lines and power equipment from the hazards of overload, undervoltage, short circuit, and other faults. With the help of the anti-islanding device 15, it can have anti-islanding protection function, which is beneficial to improving the working stability of the photovoltaic grid-connected cabinet. An internal observation window 6 is provided in the middle section of the grid-connected cabinet's outer frame 1, and a three-phase four-wire metering box 7 is provided next to the internal observation window 6 in the grid-connected cabinet's outer frame 1. At the same time, a three-phase four-wire energy meter is installed in the three-phase four-wire metering box 7. Inside the grid-connected cabinet's outer frame 1, in front of the three-phase four-wire energy meter, a running current transformer 20 and a metering current transformer 23 are respectively provided. Both the running current transformer 20 and the metering current transformer 23 are electrically connected to the frame-type circuit breaker 5. The advantage of this arrangement is that the current sampler of the three-phase four-wire energy meter can collect the current signals of the three phase lines, and the voltage sampler can collect the voltage signals between the three phase lines and between the phase lines and the neutral line.

[0038] See Figures 1-6As shown, multiple molded case switches 9 are installed at the lower part of the grid-connected cabinet's outer frame 1. Four sets of photovoltaic (PV) connectors 10 are also installed below the PV connectors 9. This arrangement allows for bottom-entry and exit of wiring via the PV connectors 10, and facilitates quick plugging and unplugging of cables for disconnection and reconnection. Insulating plates 24 are installed horizontally between the various sections of the grid-connected cabinet's outer frame 1. Grounding bars 27 are installed at the bottom of the lower sections of the outer frame 1. Mains power input connectors 19 and PV power input connectors 22 are installed on the upper structural beams 21 of the outer frame 1. The mains power input connectors 19 are electrically connected to the isolating knife switch above them via cables. The isolating knife switch is electrically connected to the metering current transformer 23 via cables passing through the insulating plate 24. This arrangement allows for overall power control via the isolating knife switch, while the mains power input connectors 19 and PV power input connectors 22 facilitate cable connection. The bottom of the grid-connected cabinet's outer frame 1 is provided with an external mains cable inlet hole 29 and four cable outlet holes 30. The upper part of the external mains cable inlet hole 29 and the four cable outlet holes 30 is provided with a docking module 18. Preferably, the docking module 18 adopts post-insulation layer technology, which has the characteristics of full insulation, full sealing and full shielding, making it safer and more reliable in application. At the same time, it can operate for a long time under harsh conditions and is suitable for various cable cross-sections and cross-linked polyethylene cables.

[0039] See Figures 1-5 As shown, the design of each component has been further optimized. Specifically, a cabinet door 3 is installed at the front of the grid-connected cabinet outer frame 1, and a door handle 4 is installed on the surface of the cabinet door 3 to facilitate the opening and closing control of the cabinet door 3. Optionally, a protective shell 2 is installed on the top of the grid-connected cabinet outer frame 1 to provide waterproofing and dustproofing, protecting the internal components of the grid-connected cabinet outer frame 1 from harsh environments. Furthermore, lead seals 11 are installed beside the frame-type circuit breaker 5 and the three-phase four-wire metering box 7 to identify the frame-type circuit breaker 5 and the three-phase four-wire metering box 7 and prevent unauthorized tampering. More specifically, the inner observation window 6 has two reserved meter positions 12 for installing power meters, allowing for the measurement of power data through the reserved meter positions 12.

[0040] See Figures 1-6As shown, each photovoltaic connector 10 is equipped with four quick-connect holes 13 for cable output, enabling the connection of sixteen cable outputs using four sets of photovoltaic connectors 10. Optionally, the grid-connected cabinet frame 1 has a multi-function meter hole 14 next to the anti-islanding device 15. Next to the multi-function meter hole 14 are hole 16 for the circuit breaker button and indicator light, and hole 17 for the molded case switch indicator light. This arrangement facilitates the easy assembly and installation of the multi-function meter using the multi-function meter hole 14, enabling convenient data measurement and control acquisition. Specifically, the hole 16 for the circuit breaker button and indicator light, and the hole 17 for the molded case switch indicator light include: a circuit breaker button hole, a circuit breaker button hole, a circuit breaker indicator light hole, a circuit breaker indicator light hole, a hole for the indicator light of molded case switch 9 (number 1), a hole for the indicator light of molded case switch 9 (number 2), a hole for the indicator light of molded case switch 9 (number 3), and a hole for the indicator light of molded case switch 9 (number 4). Optionally, the isolating knife switch is equipped with an external isolating operating handle 26 extending outside the grid-connected cabinet outer frame 1, facilitating operation using the lever transmission principle and making it easier for construction personnel to install and use the photovoltaic grid-connected cabinet. Furthermore, the bottom of the grid-connected cabinet outer frame 1 is provided with multiple fixing screw holes 28 to ensure proper fixing and installation of the grid-connected cabinet outer frame 1, while completely concealing any exposed screws that may be live. More specifically, each cable outlet hole 30 has four holes to allow for plug-in electrical connections to all sixteen cable outlets.

[0041] In practical design, the grid-connected cabinet's outer frame 1 features an external mains cable inlet 29 and four cable outlet 30s at its bottom. Simultaneously, the frame 1 has four sets of photovoltaic connectors 10 below the plastic-cased switch 9, each with four quick-connect cable outlet 13s. This design achieves bottom-entry / outlet cable access, enhancing the safety of the photovoltaic grid-connected cabinet. It also allows for quick, simple, and safe connection and disconnection of cable conduits, improving work efficiency. Furthermore, the isolating knife switch has an external isolating operating handle 26 extending outside the grid-connected cabinet's outer frame 1, utilizing lever transmission principles for easy installation and use by construction personnel, further improving work efficiency. Moreover, the use of photovoltaic connectors 10 at the lower part of the grid-connected cabinet's outer frame 1 enables modular design. The overall design enhances safety, practicality, and protection. The screw holes 28 completely conceal any exposed, potentially live screws, improving on-site construction efficiency. Furthermore, the grid-connected cabinet's outer frame 1 uses a frame-type circuit breaker 5 as the main switch, allowing for manual or electric operation of the energy storage power supply. The multi-functional digital display meter, installed through the multi-functional meter hole 14, enables remote control of the circuit breaker 5's opening and closing operations and the transmission of switch status signals via input and output. The grid-connected cabinet's outer frame 1 is equipped with an anti-islanding device 15, providing anti-islanding protection and improving the stability of the photovoltaic grid-connected cabinet. Finally, the top of the grid-connected cabinet's outer frame 1 is enclosed with a protective shell 2, which provides waterproofing and dustproofing, protecting the internal components from harsh environments.

[0042] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A new photovoltaic grid-connected cabinet, comprising a grid-connected cabinet shell frame (1), characterized in that: The grid-connected cabinet outer frame (1) is divided into three main sections from top to bottom. The upper end of the grid-connected cabinet outer frame (1) is provided with circuit breaker outer frame placement holes, and the circuit breaker outer frame placement holes are equipped with frame-type circuit breakers (5). At the same time, the grid-connected cabinet outer frame (1) is equipped with an anti-islanding device (15) on the side of the frame-type circuit breaker (5). An inner observation window (6) is provided at intervals in the middle section of the grid-connected cabinet outer frame (1), and a three-phase four-wire metering box (7) is provided on the side of the inner observation window (6) of the grid-connected cabinet outer frame (1). At the same time, a three-phase four-wire energy meter is installed in combination with the three-phase four-wire metering box (7). An operating current transformer (20) and a metering current transformer (23) are respectively provided in front of the three-phase four-wire energy meter inside the grid-connected cabinet outer frame (1), and the operating current transformer (20) and the metering current transformer (23) are both electrically connected to the frame-type circuit breaker (5). Multiple plastic-shell switches (9) are installed at the lower part of the grid-connected cabinet outer frame (1), and four sets of photovoltaic docking plugs (10) are provided below the plastic-shell switches (9) in the grid-connected cabinet outer frame (1). Insulating plates (24) are installed horizontally between the various intervals of the grid-connected cabinet outer frame (1). A grounding bar (27) is installed at the bottom of the lower section of the grid-connected cabinet outer frame (1). The structural beams (21) on the upper part of the grid-connected cabinet outer frame (1) are respectively equipped with mains power inlet plugs (19) and photovoltaic power inlet plugs (22). The mains power inlet plugs (19) are electrically connected to the isolating knife switch above them by a cable. The isolating knife switch is electrically connected to the metering current transformer (23) by passing a cable through the insulating plate (24). The bottom of the grid-connected cabinet outer frame (1) is provided with an external mains cable inlet hole (29) and four cable outlet holes (30). The upper part of the external mains cable inlet hole (29) and the four cable outlet holes (30) is provided with a docking module (18).

2. The novel photovoltaic grid-connected cabinet according to claim 1, characterized in that: The front of the grid-connected cabinet shell frame (1) is equipped with a cabinet door (3), and a door handle (4) is installed on the surface of the cabinet door (3).

3. The novel photovoltaic grid-connected cabinet according to claim 1, characterized in that: The top of the grid-connected cabinet frame (1) is fitted with a protective shell (2).

4. The novel photovoltaic grid-connected cabinet according to claim 1, characterized in that: Lead seals (11) are provided on the sides of the frame circuit breaker (5) and the three-phase four-wire metering box (7).

5. The novel photovoltaic grid-connected cabinet according to claim 1, characterized in that: The inner observation window (6) is provided with two reserved meter positions (12) for installing electricity meters.

6. The novel photovoltaic grid-connected cabinet according to claim 1, characterized in that: Each of the photovoltaic connectors (10) is equipped with four quick-connect holes (13) for cable output.

7. The novel photovoltaic grid-connected cabinet according to claim 1, characterized in that: The grid-connected cabinet outer frame (1) is provided with a multi-functional meter hole (14) on the side of the anti-islanding device (15). At the same time, the multi-functional meter hole (14) is provided with a switch opening and closing button and indicator light hole (16) and a plastic case switch indicator light hole (17).

8. The novel photovoltaic grid-connected cabinet according to claim 1, characterized in that: The isolating knife switch is provided with an external isolating operating handle (26) that extends outside the outer frame (1) of the grid-connected cabinet.

9. The novel photovoltaic grid-connected cabinet according to claim 1, characterized in that: The bottom of the grid-connected cabinet shell frame (1) is provided with a plurality of fixed screw hole positions (28).

10. The novel photovoltaic grid-connected cabinet according to claim 1, characterized in that: The number of the cable outlet hole positions (30) of each path is four.

Images