Photovoltaic grid-connected box

Abstract

The utility model belongs to the technical field of photovoltaic grid-connected power distribution, and discloses a photovoltaic grid-connected box which comprises a box body, and a power distribution connection module used for connecting a photovoltaic power generation system and a power grid is arranged in the box body. The power distribution connection module comprises a first circuit breaker used for being electrically connected with the photovoltaic power generation system, the output end of the first circuit breaker is connected with an automatic reclosing lock and a second circuit breaker, the output end of the automatic reclosing lock is electrically connected with at least one electric energy meter, and the output end of the electric energy meter is electrically connected with a power grid through an isolation switch. And the output end of the second circuit breaker is electrically connected with a surge protector. The grid-connected box has an automatic reclosing function, when the voltage exceeds the conventional 380V, the grid-connected box trips automatically to form effective protection of the whole circuit, when the voltage is lower than the conventional 380V, the grid-connected box trips automatically to form effective circuit protection, and when the voltage recovers to a normal value, the grid-connected box recovers to the normal value automatically to start normal work.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic grid-connected power distribution, and specifically relates to a photovoltaic grid-connected box. Background Art

[0002] The photovoltaic grid-connected box, as the total outlet of the photovoltaic power station, exists in the photovoltaic system. It is a distribution device that connects the photovoltaic power station and the power grid. Its main function is to serve as the dividing point between the photovoltaic power generation system and the power grid. For low-voltage grid-connected photovoltaic power stations, metering, protection and other functional devices can also be installed in the photovoltaic grid-connected box.

[0003] The conventional grid-connected boxes on the market now have conventional switch functions, that is, when turned on, power is supplied, and when turned off, power is cut off. The disadvantage is that it cannot form a protection function, and circuit protection is not designed. It is just a conventional switch function, which requires manual switch operation, which has low safety, is time-consuming, labor-intensive, and inconvenient. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a photovoltaic grid-connected box to solve the problem that the existing photovoltaic distribution box does not have a circuit protection function and requires manual on-site switch operation.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A photovoltaic grid-connected box comprises a box body, in which a power distribution connection module for connecting a photovoltaic power generation system with a power grid is arranged;

[0007] The power distribution connection module includes a first circuit breaker for electrically connecting the photovoltaic power generation system, and the output end of the first circuit breaker is respectively connected to an automatic reclosing switch and a second circuit breaker, wherein the output end of the automatic reclosing switch is electrically connected to at least one electric energy meter, the output end of the electric energy meter is electrically connected to the power grid through an isolating switch, and the output end of the second circuit breaker is electrically connected to a surge protector, and the output end of the surge protector is grounded.

[0008] In a possible implementation, the electric energy meter is provided with two, namely a unidirectional meter and a bidirectional meter, which are connected in series between the automatic reclosing switch and the isolating switch. The unidirectional meter is used to record the total amount of photovoltaic power generation, and the bidirectional meter is used to record the power consumption of the power grid and the power output to the power grid.

[0009] In a possible implementation, the second circuit breaker is a circuit breaker equipped with a lightning protection switch.

[0010] In a possible implementation, the isolating switch is a knife switch.

[0011] In a possible implementation, the box body is provided with a first installation cavity and a second installation cavity, at least one installation bracket is provided in the first installation cavity, and one of the electric energy meters is installed through the installation brackets;

[0012] The first circuit breaker, the automatic reclosing switch, the second circuit breaker, the isolating switch and the surge protector are installed in the second installation cavity.

[0013] In a possible implementation, the first installation cavity is open on one side of the front face of the box body, and an openable first box door is installed on the open side of the first installation cavity;

[0014] The second installation cavity is open on one side of the front of the box body, and an openable second box door is installed on the open side of the second installation cavity;

[0015] The first door and the second door are both made of insulating material.

[0016] In a possible implementation, the top of the first installation cavity is open, and a box cover is provided on the box body and the top of the first installation cavity. The box cover has a guard edge extending toward the circumferential side, the guard edge is hollow inside and connected to the first installation cavity, and a plurality of through ventilation holes are provided at the bottom of the guard edge, and each ventilation hole is provided with an insect-proof net.

[0017] In a possible implementation, the top of the box cover is a herringbone flow guide structure.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The photovoltaic grid-connected box of the utility model has an automatic reclosing function. When the voltage exceeds the conventional 380V, it will automatically trip to form an effective protection for the entire circuit. When the voltage is lower than the conventional 380V, it will also automatically trip to form an effective circuit protection. When the voltage returns to normal, the grid-connected box will automatically return to normal and start normal operation, reducing manual opening and closing operations.

[0020] Moreover, by installing a circuit breaker with a lightning protection switch, switch protection before lightning protection is increased, lightning protection is effectively protected, and lightning strike protection in thunderstorm weather is increased. Moreover, it is installed in two installation cavities, which can better separate the circuit components and is safer.

[0021] At the same time, the first box door and the second box door made of insulating material can effectively block the occurrence of electric shock and form insulation protection. The box cover is provided with ventilation holes and insect-proof nets to effectively prevent mosquitoes from entering and form internal protection.

[0022] In addition, the top of the box cover is designed as a pedestrian diversion structure to avoid the accumulation of rainwater and achieve better drainage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the connection principle of the power distribution connection module of an embodiment of the present application;

[0025] Figure 3 It is a front view of the box body of the embodiment of the present application;

[0026] Figure 4 A side view of a box body according to an embodiment of the present application;

[0027] Figure 5 This is a bottom view of the box body of the embodiment of the present application.

[0028] In the figure: 1-box body; 11-first installation cavity; 12-second installation cavity; 13-box cover; 14-first box door; 15-second box door; 16-stop edge; 17-vent; 2-electricity meter; 3-first circuit breaker; 4-automatic reclosing switch; 5-isolating switch; 6-lightning protection switch; 7-surge protector; 8-mounting bracket. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Please refer to Figure 1-5 As shown, an embodiment of the present application provides a photovoltaic grid-connected box, including a box body 1, in which a distribution connection module for connecting a photovoltaic power generation system and a power grid is provided; the distribution connection module includes a first circuit breaker 3 for electrically connecting the photovoltaic power generation system, and the output ends of the first circuit breaker 3 are respectively connected to an automatic reclosing switch 4 and a second circuit breaker, the output end of the automatic reclosing switch 4 is electrically connected to at least one electric energy meter 2, the output end of the electric energy meter 2 is electrically connected to the power grid through an isolating switch 5, and the output end of the second circuit breaker is electrically connected to a surge protector 7, and the output end of the surge protector 7 is grounded.

[0032] Among them, the power distribution connection module is installed in the box 1, which can connect the photovoltaic power generation system to the power grid. The power distribution connection module mainly includes a first circuit breaker 3, an automatic reclosing valve 4, a second circuit breaker, an electric energy meter 2, an isolating switch 5 and a surge protector 7. The first circuit breaker 3 can be electrically connected to the inverter of the photovoltaic power generation system, and under the action of the automatic reclosing valve, when the voltage exceeds the conventional 380V, it will automatically trip to form an effective protection for the entire circuit. When the voltage is lower than the conventional 380V, it will also automatically trip to form an effective circuit protection. The surge protector 7 is equivalent to an insulator, but when a strong induced current is generated by a lightning strike, the surge protector 7 will become a conductor, introducing the induced current into the earth, and realizing the protection function under weather conditions such as lightning strikes, further improving the protection of the circuit.

[0033] In one embodiment, the electric energy meter 2 is provided with two, which are a unidirectional meter and a bidirectional meter respectively connected in series between the automatic reclosing switch 4 and the isolating switch 5. The unidirectional meter is used to record the total amount of photovoltaic power generation, and the bidirectional meter is used to record the power consumption of the power grid and the power output to the power grid.

[0034] In this way, the unidirectional electricity meter is the meter connected to the output of the photovoltaic inverter, and its function is to only record the total amount of photovoltaic power generation. This electricity data is used as the basis for applying for photovoltaic project subsidies from the state. The electricity meter 2 connected to the mains is a bidirectional electricity meter, also called a bidirectional power meter, which is used to record how much electricity is used from the grid and how much electricity is output to the grid, so that the power company can calculate the electricity bill income separately.

[0035] Furthermore, in order to better cooperate with the surge protector 7 for lightning protection, the second circuit breaker is a circuit breaker equipped with a lightning protection switch 6.

[0036] Specifically, the isolating switch is a knife switch.

[0037] In an embodiment of the present application, the box body 1 is provided with a first installation cavity 11 and a second installation cavity 12, at least one installation bracket 8 is provided in the first installation cavity 11 and one of the electric energy meters 2 is installed through the installation bracket 8; the first circuit breaker 3, the automatic reclosing switch 4, the second circuit breaker, the isolating switch 5 and the surge protector 7 are installed in the second installation cavity 12.

[0038] By installing in two installation cavities, the circuit components can be better separated and safer.

[0039] In order to achieve insulation of the box body 1 when it is switched on and off, the first installation cavity 11 is open on the front side of the box body, and an openable first box door 14 is installed on the open side of the first installation cavity 11; the second installation cavity 12 is open on the front side of the box body, and an openable second box door 15 is installed on the open side of the second installation cavity 12; the first box door 14 and the second box door 15 are both made of insulating materials. The first box door 14 and the second box door 15 made of insulating materials can effectively block the occurrence of electric shock and form insulation protection.

[0040] Furthermore, the top of the first installation cavity 11 is open, and a box cover 13 is provided between the box body and the top of the first installation cavity 11. The box cover 13 has a retaining edge 16 extending toward the circumferential side. The retaining edge 16 is hollow inside and communicates with the first installation cavity 11. A plurality of through vents 17 are provided at the bottom of the retaining edge 16, and each vent 17 is provided with an insect-proof net.

[0041] In this way, the box cover 13 provided with the vent holes 17 and the insect-proof net can effectively prevent mosquitoes from entering, thereby forming internal protection.

[0042] Preferably, the top of the box cover 13 is a herringbone flow guide structure. The top of the box cover 13 is designed as a herringbone flow guide structure to avoid the accumulation of rainwater and achieve better drainage effect.

[0043] Preferred embodiment:

[0044] Please refer to Figure 1-5 As shown, a photovoltaic grid-connected box of the preferred embodiment includes a box body 1, in which a distribution connection module for connecting a photovoltaic power generation system and a power grid is provided; the distribution connection module includes a first circuit breaker 3 for electrically connecting the photovoltaic power generation system, and the output end of the first circuit breaker 3 is respectively connected to an automatic reclosing switch 4 and a second circuit breaker, wherein the output end of the automatic reclosing switch 4 is electrically connected to at least one electric energy meter 2, the output end of the electric energy meter 2 is electrically connected to the power grid through an isolating switch 5, and the output end of the second circuit breaker is electrically connected to a surge protector 7, and the output end of the surge protector 7 is grounded.

[0045] The electric energy meter 2 is provided with two unidirectional meters and bidirectional meters which are respectively connected in series between the automatic reclosing switch 4 and the isolating switch 5. The unidirectional meter is used to record the total amount of photovoltaic power generation, and the bidirectional meter is used to record the power consumption of the power grid and the amount of power output to the power grid.

[0046] The second circuit breaker is a circuit breaker equipped with a lightning protection switch 6 .

[0047] The isolating switch is a knife switch.

[0048] The box body 1 is provided with a first installation cavity 11 and a second installation cavity 12. At least one installation bracket 8 is provided in the first installation cavity 11, and one of the electric energy meters 2 is installed through the installation bracket 8; the first circuit breaker 3, the automatic reclosing switch 4, the second circuit breaker, the isolating switch 5 and the surge protector 7 are installed in the second installation cavity 12.

[0049] The first installation cavity 11 is open on the front side of the box body, and an openable first box door 14 is installed on the open side of the first installation cavity 11; the second installation cavity 12 is open on the front side of the box body, and an openable second box door 15 is installed on the open side of the second installation cavity 12; the first box door 14 and the second box door 15 are both made of insulating material.

[0050] The top of the first installation cavity 11 is open, and a box cover 13 is provided between the box body and the top of the first installation cavity 11. The box cover 13 has a retaining edge 16 extending toward the circumferential side. The retaining edge 16 is hollow inside and communicates with the first installation cavity 11. A plurality of through vents 17 are provided at the bottom of the retaining edge 16, and each vent 17 is provided with an insect-proof net.

[0051] The top of the box cover 13 is a herringbone flow guide structure.

[0052] Implementation principle: The photovoltaic grid-connected box has an automatic reclosing function. When the voltage exceeds the regular 380V, it will automatically trip to form an effective protection for the entire circuit. When the voltage is lower than the regular 380V, it will also automatically trip to form an effective circuit protection. When the voltage returns to normal, the grid-connected box will automatically return to normal and start normal operation, reducing manual opening and closing operations.

[0053] Moreover, by installing a circuit breaker with a lightning protection switch 6, switch protection before lightning protection is increased, lightning protection is effectively protected, and lightning protection in thunderstorm weather is increased. Moreover, the circuit components can be better separated and safer by installing them in two installation cavities.

[0054] At the same time, the first box door 14 and the second box door 15 made of insulating material can effectively block the occurrence of electric shock and form insulation protection, and the box cover 13 provided with ventilation holes 17 and insect-proof nets can effectively prevent mosquitoes from entering and form internal protection.

[0055] In addition, the top of the box cover 13 is designed as a pedestrian diversion structure to avoid the accumulation of rainwater and achieve a better drainage effect.

[0056] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A photovoltaic grid-connected box, characterized in that: It comprises a box (1), in which a power distribution connection module for connecting a photovoltaic power generation system and a power grid is arranged; The power distribution connection module comprises a first circuit breaker (3) for electrically connecting the photovoltaic power generation system, wherein the output end of the first circuit breaker (3) is respectively connected to an automatic reclosing switch (4) and a second circuit breaker, wherein the output end of the automatic reclosing switch (4) is electrically connected to at least one electric energy meter (2), the output end of the electric energy meter (2) is electrically connected to the power grid via an isolating switch (5), and the output end of the second circuit breaker is electrically connected to a surge protector (7), and the output end of the surge protector (7) is grounded.

2. A photovoltaic grid-connected box according to claim 1, characterized in that: The electric energy meter (2) is provided with two unidirectional electric energy meters and a bidirectional electric energy meter which are respectively connected in series between the automatic reclosing switch (4) and the isolating switch (5). The unidirectional electric energy meter is used to record the total amount of photovoltaic power generation, and the bidirectional electric energy meter is used to record the power consumption of the power grid and the amount of power output to the power grid.

3. A photovoltaic grid-connected box according to claim 1, characterized in that: The second circuit breaker is a circuit breaker equipped with a lightning protection switch (6).

4. A photovoltaic grid-connected box according to claim 1, characterized in that: The isolating switch (5) is a knife switch.

5. A photovoltaic grid-connected box according to any one of claims 1 to 4, characterized in that: The box body (1) is provided with a first installation cavity (11) and a second installation cavity (12); at least one installation bracket (8) is provided in the first installation cavity (11) and one of the electric energy meters (2) is installed through the installation bracket (8); The first circuit breaker (3), the automatic reclosing switch (4), the second circuit breaker, the isolating switch (5) and the surge protector (7) are installed in the second installation cavity (12).

6. A photovoltaic grid-connected box according to claim 5, characterized in that: The first installation cavity (11) is open on the front side of the box body, and an openable first box door (14) is installed on the open side of the first installation cavity (11); The second installation cavity (12) is open on the front side of the box body, and an openable second box door (15) is installed on the open side of the second installation cavity (12); The first door (14) and the second door (15) are both made of insulating material.

7. A photovoltaic grid-connected box according to claim 6, characterized in that: The top of the first installation cavity (11) is open, and a box cover (13) is provided between the box body and the top of the first installation cavity (11), the box cover (13) has a retaining edge (16) extending toward the circumferential side, the retaining edge (16) is hollow inside and communicates with the first installation cavity (11), and a plurality of through vents (17) are provided at the bottom of the retaining edge (16), and each vent (17) is provided with an insect-proof net.

8. A photovoltaic grid-connected box according to claim 7, characterized in that: The top of the box cover (13) is a herringbone flow-guiding structure.

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