Box-type substation and photovoltaic system

Abstract

A box-type substation and a photovoltaic system, the box-type substation comprises a box body, a first low-voltage cabinet and a transformer, the box body accommodates the first low-voltage cabinet and the transformer, the box body comprises a frame body and a first box door, and the first box door is installed on the frame body. The first low-voltage cabinet is used for connecting the transformer and the power conversion equipment, a circuit breaker is arranged in the first low-voltage cabinet, the first low-voltage cabinet and the first box door are oppositely arranged, and a cabinet plate, facing the first box door, of the first low-voltage cabinet is provided with a first communication port. The first communication port is used for heat dissipation of the circuit breaker and arcing release. Wherein when the first box door is in an open state, the box-type substation is in a power-off state. When the first box door is in the open state, the box-type substation is controlled to be forcibly powered off, so that arcing in the first low-voltage cabinet is prevented, the risk of arcing release does not exist at the first communication port, and the safety of the box-type substation is improved.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a box-type substation and a photovoltaic system. Background Art

[0002] Box-type substations are also called prefabricated substations. Box-type substations organically combine transformer boosting, power distribution and other functions. Box-type substations are mainly used in new energy scenarios such as photovoltaics, wind power, and energy storage. With the rapid development of new energy, the application of box-type substations in the new energy field has become more and more popular, and their safety has also received more and more attention. Due to the size restrictions of box-type substations, electrical components (such as circuit breakers) in low-voltage cabinets are required to be arranged in a high-density manner, and the thermal risk is extremely high. A large area of ​​air ducts needs to be opened to achieve heat dissipation. When the operator opens the door to operate the low-voltage cabinet, if the arc in the low-voltage cabinet bursts out from the air duct, it is easy to cause damage to the operator. Summary of the invention

[0003] The embodiments of the present application provide a box-type substation and a photovoltaic system, which can improve the safety of the box-type substation.

[0004] In the first aspect, the present application provides a box-type substation, which includes a box body, a first low-voltage cabinet and a transformer. The box body accommodates the first low-voltage cabinet and the transformer. The box body includes a frame and a first box door, and the first box door is installed on the frame. The first low-voltage cabinet is used to connect the transformer and the power conversion equipment. A circuit breaker is arranged in the first low-voltage cabinet. The first low-voltage cabinet is arranged opposite to the first box door. The first low-voltage cabinet is provided with a first connecting port on the cabinet panel facing the first box door. The first connecting port is used to dissipate heat from the circuit breaker and for arc release. When the first box door is in an open state, the box-type substation is in a power-off state.

[0005] When the first box door is in an open state, the first connecting port is exposed to the outside. If there is a risk of arcing in the first low-voltage cabinet, the arc released from the first connecting port is likely to cause damage to the operator. The box-type substation in the present application controls the box-type substation to forcibly cut off the power when the first box door is in an open state to prevent the occurrence of arcing in the first low-voltage cabinet. There is no risk of arcing release at the first connecting port, which is conducive to improving the safety of the box-type substation.

[0006] In a possible implementation, the box body further includes a second box door, and the second box door is connected to the frame body. The box-type substation further includes a second low-voltage cabinet, which is arranged in parallel with the first low-voltage cabinet, the interior of the second low-voltage cabinet is connected to the interior of the first low-voltage cabinet, the second low-voltage cabinet is arranged opposite to the second box door, and the cabinet panel of the second low-voltage cabinet facing the second box door is provided with an operating component. The operating component is connected to the electrical components in the second low-voltage cabinet. When the second box door is in an open state, the box-type substation is in a powered state.

[0007] Since the second low-voltage cabinet is connected to the first low-voltage cabinet, when the electrical components in the second low-voltage cabinet are at risk of arcing, the arc will be released from the first connecting port of the first low-voltage cabinet, and the first door can block the arc released from the first connecting port when the first door is in the closed state. When the operator opens the second door and operates the electrical components in the second low-voltage cabinet through the operating parts, it is not easy to cause harm to the operator. The equipment inspection and maintenance of the second low-voltage cabinet can be carried out without interrupting the power supply, thereby ensuring the continuous operation of the photovoltaic system and improving the power supply reliability.

[0008] In a possible implementation, the box-type substation further includes a first transverse partition, at least a portion of which is located in the first low-voltage cabinet and is arranged perpendicular to the cabinet panel of the first low-voltage cabinet. A circuit breaker and a first connecting port are arranged on the same side of the first transverse partition along the height direction of the box-type substation.

[0009] In a possible implementation, the box-type substation further includes a second communication port, and along the height direction of the box-type substation, the second communication port is located on a side of the first transverse partition away from the first communication port.

[0010] That is, along the height direction of the box-type substation, the second connecting port is located on the side of the first transverse partition away from the circuit breaker. When the box-type substation is in the power-on state and the circuit breaker in the first low-voltage cabinet is at risk of arcing, part of the arcing generated by the circuit breaker failure needs to bypass the first transverse partition before it can be released from the second connecting port. The setting of the first transverse partition prolongs the path of the arcing release from the second connecting port, so that the arcing is continuously weakened during the release process, reducing the arcing hazard at the second connecting port. In addition, when the first connecting port and the second connecting port are used to dissipate heat in the first low-voltage cabinet and the second low-voltage cabinet, due to the blocking of the first transverse partition, the cooling air entering from the first connecting port is prevented from directly exiting from the second connecting port, extending the path of the cooling air in the first low-voltage cabinet and the second low-voltage cabinet, thereby helping to improve the heat dissipation performance of the first low-voltage cabinet and the second low-voltage cabinet. In addition, the setting of the second connecting port increases the channel for the first low-voltage cabinet and the second low-voltage cabinet to release the arcing, so that the first low-voltage cabinet and the second low-voltage cabinet form a low-voltage cabinet with a non-enclosed structure, preventing the arcing from exploding in a closed space.

[0011] In a possible implementation, the box-type substation further includes a first vertical partition, which is connected to a side of the first transverse partition away from the circuit breaker and extends toward the second connecting port along the height direction of the box-type substation, and the first vertical partition shields at least a portion of the second connecting port.

[0012] The first vertical partition is arranged on the path of the arc released from the second connecting port. The first vertical partition can further block the arc released from the second connecting port, further weaken the arc on this path, and reduce the possibility of the arc being released from the second connecting port.

[0013] In a possible implementation, the box-type substation also includes a second cross partition, at least part of which is arranged in the first low-voltage cabinet and is arranged vertically with the cabinet panel of the first low-voltage cabinet. Along the height direction of the box-type substation, a circuit breaker and a first connecting port are provided between the second cross partition and the first cross partition, and a cable is provided on the side of the second cross partition away from the circuit breaker, and the cable is connected to the transformer.

[0014] The circuit breaker and the cable are separated by the second transverse partition. When an arc fault occurs in the circuit breaker, the second transverse partition can effectively prevent the arc from spreading to the cable, thereby reducing the impact of the arc on the cable.

[0015] In a possible implementation, the box-type substation further includes a third connecting port, and along the height direction of the box-type substation, the third connecting port is located on a side of the second transverse partition away from the first connecting port.

[0016] The third connecting port provides a channel for the first low-voltage cabinet and the second low-voltage cabinet to release the arc, so that the first low-voltage cabinet and the second low-voltage cabinet form a low-voltage cabinet with a non-enclosed structure, preventing the arc from exploding in the enclosed space. When the circuit breaker fails and an arc is generated, the second transverse partition can block the arc, effectively reducing the possibility of the arc being released from the third connecting port.

[0017] In a possible implementation, the box-type substation further includes a second vertical partition, which is disposed between the first low-voltage cabinet and the second low-voltage cabinet, and extends along a height direction of the box-type substation.

[0018] The second vertical partition serves to block the spread of arcing, so as to reduce the mutual influence of arcing of the low-voltage cabinets on both sides of the second vertical partition, so that the low-voltage cabinets on both sides of the second vertical partition can meet the requirements of arc fault test-arc level C. After cleaning the faulty components affected by arcing, each low-voltage cabinet can continue to operate, effectively reducing the losses caused by the shutdown of the box-type substation.

[0019] In a possible implementation, the box-type substation also includes a mounting plate, which is arranged between the first transverse partition and the second transverse partition, and the mounting plate extends along the height direction of the box-type substation. Circuit breakers and busbars are arranged on opposite sides of the mounting plate, and the busbar electrically connects the circuit breaker and the transformer.

[0020] The circuit breaker and the busbar are separated by the mounting plate, so that when arcing occurs in the circuit breaker or the busbar, the influence of arc spreading on the busbar or the circuit breaker can be reduced.

[0021] In a possible implementation, the box-type substation also includes a branch bar and a third vertical partition. The branch bar connects the circuit breaker and the busbar. The branch bar is arranged opposite to the cabinet panel of the first low-voltage cabinet. The third vertical partition is arranged between the branch bar and the cabinet panel of the first low-voltage cabinet.

[0022] When an arc fault occurs in the branch row, the third vertical partition can block the arc, and the arc is not easy to break through the cabinet panel of the first low-voltage cabinet.

[0023] In a second aspect, the present application provides a photovoltaic system, which includes a power conversion device and a box-type substation as provided in the first aspect, wherein the power converter is used to convert direct current from a photovoltaic module or an energy storage battery into alternating current, and output the alternating current to the box-type substation. The box-type substation is used to boost the alternating current output by the power conversion device and output it to a power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0025] Figure 1 A schematic diagram of a photovoltaic system network provided in one embodiment of the present application;

[0026] Figure 2 A schematic diagram of the three-dimensional structure of a box-type substation provided in one embodiment of the present application;

[0027] Figure 3 A schematic diagram of the structures of a first low-voltage cabinet, a second low-voltage cabinet and a third low-voltage cabinet provided in an embodiment of the present application;

[0028] Figure 4 A schematic diagram of the structures of the first door, the second door and the third door provided in one embodiment of the present application;

[0029] Figure 5 A schematic structural diagram of a first low-voltage cabinet, a second low-voltage cabinet, and a third low-voltage cabinet from a perspective provided in an embodiment of the present application;

[0030] Figure 6 for Figure 5 A partial structural schematic diagram of the first low-voltage cabinet, the second low-voltage cabinet and the third low-voltage cabinet shown;

[0031] Figure 7 A schematic structural diagram of a first low-voltage cabinet, a second low-voltage cabinet, and a third low-voltage cabinet from another perspective provided in an embodiment of the present application;

[0032] Figure 8 for Figure 7 The enlarged view of position VIII in the middle;

[0033] Fig. 9 A schematic diagram of the structure of the circuit breaker, branch bar and busbar connection provided in one embodiment of the present application;

[0034] Fig.10 for Fig. 9 A partial structural diagram of the circuit breaker, branch bar and busbar connection shown;

[0035] Fig.11 A schematic diagram of the structure of a cabinet door from a viewing angle provided by an embodiment of the present application;

[0036] Fig.12 for Fig.11 Enlarged view of XII in the middle;

[0037] Fig.13 A schematic diagram of the structure of a cabinet door from another perspective provided in an embodiment of the present application;

[0038] Fig.14 A schematic diagram of the structure of the connection between a cabinet frame and a fixing frame provided in one embodiment of the present application.

[0039] Description of reference numerals:

[0040] X-length direction; Y-width direction; Z-height direction; 10-box; 11-frame; 12-first box door; 13-second box door; 14-third box door; 15-first side door; 16-second side door; 20a-first low-voltage cabinet; 20b-second low-voltage cabinet; 20c-third low-voltage cabinet; 21-circuit breaker; 22-branch row; 23-busbar; 24-operating component; 25-cable; 26-cabinet door; 261-first door panel; 262-second door panel; 263-blocking member; 27-cabinet frame ; 28-door lock; 29-fixing bracket; 30-transformer; 40-first connecting port; 41-first horizontal partition; 42-second connecting port; 43-first vertical partition; 44-second horizontal partition; 45-third connecting port; 46-second vertical partition; 47-mounting plate; 48-third vertical partition; 100-box-type substation; 200-photovoltaic module; 300-power conversion equipment; 301-photovoltaic inverter; 302-energy storage converter; 400-boosting station; 500-power grid; 600-energy storage system. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0042] See also Figure 1 , Figure 1A network diagram of a photovoltaic system provided for one embodiment of the present application. The photovoltaic system may be a household photovoltaic system, a large ground power station, or a photovoltaic storage system for industrial and commercial applications. The photovoltaic system includes a box-type substation 100, a photovoltaic module 200, a power conversion device 300, a booster station 400, a power grid 500, and an energy storage system 600. Among them, the power conversion device 300 is used to convert the direct current from the photovoltaic module 200 or the energy storage battery in the energy storage system 600 into alternating current, and output the alternating current to the box-type substation 100. The box-type substation 100 is used to boost the alternating current output by the power conversion device 300 and output it to the power grid 500.

[0043] Specifically, the photovoltaic module 200 converts solar energy into direct current through the photovoltaic effect, and the photovoltaic inverter 301 converts the direct current output by the photovoltaic module 200 into alternating current and further transmits the alternating current to the box-type substation 100. After the box-type substation 100 converts the low-voltage alternating current output by the photovoltaic inverter 301 into medium-voltage alternating current, it further transmits the alternating current to the booster station 400 (grid 500) or the box-type substation 100 corresponding to the energy storage system 600. The energy storage system 600 is used to store unstable electric energy from the photovoltaic module 200, and output stable electric energy to the grid 500 through the energy storage converter 302 and the corresponding box-type substation 100. It can be understood that the energy storage system 600 includes an energy storage battery, and the direct current of the energy storage battery is converted into alternating current through the energy storage converter 302. The energy storage converter 302 is also used to convert the alternating current of the box-type substation 100 corresponding to the energy storage system 600 into direct current to charge the energy storage system 600.

[0044] Among them, the box-type substation 100 is a pre-assembled substation that integrates medium and low voltage complete sets of equipment and transformers in a box with a specific appearance. After being transported to the site, it can be directly connected and used. It has the advantages of convenient installation, flexible layout, short construction period, and easy movement.

[0045] Figure 1 In the photovoltaic system shown, the photovoltaic inverter 301 and the energy storage converter 302 are core devices for power conversion, and they are collectively referred to as a power conversion device 300 .

[0046] See also Figure 2 and Figure 3 , Figure 2 A schematic diagram of the three-dimensional structure of a box-type substation 100 provided in one embodiment of the present application. Figure 3A schematic diagram of the structure of the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c provided in one embodiment of the present application. The box-type substation 100 includes a box body 10, a first low-voltage cabinet 20a, a second low-voltage cabinet 20b, a third low-voltage cabinet 20c and a transformer 30. The box body 10 accommodates the first low-voltage cabinet 20a, the second low-voltage cabinet 20b, the third low-voltage cabinet 20c and the transformer 30, wherein the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c are arranged in an array, and the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c are all used to connect the transformer 30 and the power conversion device 300.

[0047] The first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c are arranged in sequence along the width direction Y of the box-type substation 100 and form a "concave" structure to achieve a compact layout of the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c, and a high-density layout of electrical components in the cabinet. Among them, the electrical components can be devices such as circuit breakers 21, branch bars 22 and bus bars 23.

[0048] In other embodiments, the box-type substation 100 may be provided with only the first low-voltage cabinet 20a or only the first low-voltage cabinet 20a and the second low-voltage cabinet 20b. This application takes the box-type substation 100 including the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c arranged in sequence along the width direction Y of the box-type substation 100 as an example to describe the box-type substation 100 in detail.

[0049] Please combine Figure 4 , Figure 4 The schematic diagram of the structure of the first door 12, the second door 13 and the third door 14 provided in one embodiment of the present application. The box body 10 includes a frame body 11, a first door 12, a second door 13 and a third door 14, and the first door 12, the second door 13 and the third door 14 are all connected to the frame body 11. The first door 12, the second door 13 and the third door 14 can be directly connected to the frame body 11; or, the first door 12 and the third door 14 are directly connected to the frame body 11, the second door 13 can be connected to the frame body 11 through the first door 12 or the third door 14, and the second door 13 and the first door 12, or the second door 13 and the third door 14 form a folding door.

[0050] In one embodiment, the first box door 12, the second box door 13 and the third box door 14 are all arranged on the same side of the frame 11 along the length direction X of the box-type substation 100, the first box door 12 is arranged opposite to the first low-voltage cabinet 20a, the second box door 13 is arranged opposite to the second low-voltage cabinet 20b, and the third box door 14 is arranged opposite to the third low-voltage cabinet 20c. When the first box door 12, the second box door 13 and the third box door 14 are located on the same side of the frame 11, the second box door 13 can form a folding door with the first box door 12 or the third box door 14. In other embodiments, the first box door 12, the second box door 13 and the third box door 14 can be arranged on different sides of the frame 11, and the specific details are not limited. The first box door 12, the second box door 13 and the third box door 14 of the present application are all arranged on the same side of the frame 11 along the length direction X of the box-type substation 100 as an example for explanation.

[0051] like Figure 2 As shown, in another embodiment, the box body 10 further includes a first side door 15 and a second side door 16, and the first side door 15 and the second side door 16 are provided on opposite sides of the frame body 11 along the width direction Y of the box-type substation 100, and the first side door 15 is arranged opposite to the cabinet plate of the first low-voltage cabinet 20a on the side away from the second low-voltage cabinet 20b, and the second side door 16 is arranged opposite to the cabinet plate of the third low-voltage cabinet 20c on the side away from the second low-voltage cabinet 20b. The cabinet plate of the first low-voltage cabinet 20a on the side away from the second low-voltage cabinet 20b and the cabinet plate of the third low-voltage cabinet 20c on the side away from the second low-voltage cabinet 20b can both be provided with an operating component 24, wherein the operating component 24 on the first low-voltage cabinet 20a is connected to the electrical components in the first low-voltage cabinet 20a, and the operating component 24 on the third low-voltage cabinet 20c is connected to the electrical components in the third low-voltage cabinet 20c. The operator can open the first side door 15 to operate the operating component 24 on the first low-voltage cabinet 20 a and open the second side door 16 to operate the operating component 24 on the third low-voltage cabinet 20 c .

[0052] See also Figure 3 , Figure 4 and Figure 5 , Figure 5A schematic diagram of the structure of the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c from a perspective provided in an embodiment of the present application. A circuit breaker 21 is provided in the first low-voltage cabinet 20a, and a first connecting port 40 is provided on the cabinet panel of the first low-voltage cabinet 20a facing the first box door 12. The first connecting port 40 is used to dissipate heat from the circuit breaker 21 and to release arcs. Among them, when the first box door 12 is in an open state, the box-type substation 100 is in a power-off state. When the first box door 12 is in an open state, the first connecting port 40 is exposed to the outside. If the risk of arcing occurs in the first low-voltage cabinet 20a, the arc released from the first connecting port 40 is likely to cause damage to the operator. The box-type substation 100 in the present application controls the box-type substation 100 to forcibly cut off the power when the first box door 12 is in an open state to prevent the occurrence of arcing in the first low-voltage cabinet 20a. There is no risk of arcing release at the first connecting port 40, which is conducive to improving the safety of the box-type substation 100.

[0053] In order to enhance heat dissipation, a heat exchanger can be arranged in the first box door 12. When the first box door 12 is in a closed state, the heat exchanger abuts against the cabinet panel of the first low-pressure cabinet 20a facing the first box door 12 and covers the first connecting port 40. The heat exchanger can exchange heat with the hot air in the first low-pressure cabinet 20a, the second low-pressure cabinet 20b and the third low-pressure cabinet 20c through the first connecting port 40, thereby realizing heat dissipation of electrical components in the first low-pressure cabinet 20a, the second low-pressure cabinet 20b and the third low-pressure cabinet 20c.

[0054] The interior of the second low-voltage cabinet 20b is connected to the interior of the first low-voltage cabinet 20a, and the cabinet panel of the second low-voltage cabinet 20b facing the second cabinet door 13 is provided with an operating component 24, and the operating component 24 is connected to the electrical components in the second low-voltage cabinet 20b. When the second cabinet door 13 is in an open state, the box-type substation 100 is in a powered state. The operating component 24 can be a switch button or a display panel, etc., for operators to inspect or maintain the electrical components in the second low-voltage cabinet 20b.

[0055] Since the second low-voltage cabinet 20b is connected to the first low-voltage cabinet 20a, when the electrical components in the second low-voltage cabinet 20b are at risk of arcing, the arcing will be released from the first connecting port 40 of the first low-voltage cabinet 20a, and when the first box door 12 is in a closed state, the first box door 12 can block the arcing released from the first connecting port 40. When the operator opens the second box door 13 and operates the electrical components in the second low-voltage cabinet 20b through the operating component 24, it is not easy to cause harm to the operator. The equipment of the second low-voltage cabinet 20b can be inspected and maintained without interrupting the power supply, ensuring the continuous operation of the photovoltaic system and improving the reliability of power supply. In addition, along the length direction X of the box-type substation 100, the second low-voltage cabinet 20b is concave relative to the first low-voltage cabinet 20a. If there is arcing release at the first connecting port 40 on the first low-voltage cabinet 20a, it is not easy to cause harm to the operator on the side of the second low-voltage cabinet 20b with the operating component 24.

[0056] In one embodiment, the first door 12 , the second door 13 and the third door 14 are arranged on the side of the frame 11 away from the transformer 30 along the length direction X of the box-type substation 100 , so that the transformer 30 is not easily damaged when the arc is released from the first connecting port 40 .

[0057] In the present application, the cabinet panel of the third low-voltage cabinet 20c facing the third cabinet door 14 is also provided with a first connecting port 40. When at least one of the first cabinet door 12 and the third cabinet door 14 is in an open state, the box-type substation 100 is in a power-off state. Specifically, by setting a sensor (such as a travel switch) to connect the first cabinet door 12 and the third cabinet door 14, when any one of the first cabinet door 12 and the third cabinet door 14 is opened, the sensor is triggered, and the sensor transmits the trigger signal to the control module (such as a relay or measurement and control), and the control module issues an instruction to control the frame circuit breaker in the first low-voltage cabinet 20a and the third low-voltage cabinet 20c to trip, so that the box-type substation 100 is powered off as a whole, increasing the safety of operation.

[0058] Similar to the first door 12, the third door 14 is also provided with a heat exchanger. When the third door 14 is in a closed state, the heat exchanger on the third door 14 abuts against the cabinet plate of the third low-voltage cabinet 20c facing the third door 14 and covers the first connecting port 40 on the third low-voltage cabinet 20c, thereby enhancing the heat dissipation of the electrical components in the three low-voltage cabinets. The heat exchanger can also block the arc released from the first connecting port 40, thereby reducing the possibility of the first door 12 and / or the third door 14 being broken by the arc.

[0059] Please combine Figure 5 and Figure 6 , Figure 6 for Figure 5The schematic diagram of the partial structure of the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c is shown. The box-type substation 100 also includes a first transverse partition 41 and a second connecting port 42. At least part of the first transverse partition 41 is located in the first low-voltage cabinet 20a and is arranged perpendicular to the cabinet plate of the first low-voltage cabinet 20a. The circuit breaker 21 and the first connecting port 40 are arranged on the same side of the first transverse partition 41 along the height direction Z of the box-type substation 100. The second connecting port 42 is located on the side of the first transverse partition 41 away from the first connecting port 40 along the height direction Z of the box-type substation 100. The second connecting port 42 is used to dissipate heat for the circuit breaker 21 and for arc release.

[0060] Specifically, along the height direction Z of the box-type substation 100 , a branch bar 22 and a bus bar 23 are also provided on one side of the first transverse partition 41 where the circuit breaker 21 is provided, wherein the circuit breaker 21 is connected to the bus bar 23 via the branch bar 22 .

[0061] The first transverse partition 41 is used to separate the first connecting port 40 from the second connecting port 42. The first transverse partition 41 can be only arranged in the first low-voltage cabinet 20a. When the cabinet panel of the third low-voltage cabinet 20c facing the third box door 14 is provided with a connecting port and a second connecting port 42, the first transverse partition 41 can also be arranged in the first low-voltage cabinet 20a and the third low-voltage cabinet 20c. When the cabinet panel of the second low-voltage cabinet 20b facing the second box door 13 is provided with a second connecting port 42, the first transverse partition 41 can also be arranged in the first low-voltage cabinet 20a and the second low-voltage cabinet 20b. In the present application, the first transverse partition 41 passes through the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c. The first transverse partition 41 divides the space formed by the three low-voltage cabinets into two upper and lower parts along the height direction Z of the box-type substation 100. A through hole is opened on the first transverse partition 41, and the through hole connects the space on the opposite sides of the first transverse partition 41 along the height direction Z of the box-type substation 100, so as to facilitate the connection of electrical components located on both sides of the first transverse partition 41.

[0062] At least one of the cabinet panels of the first low-voltage cabinet 20a, the second low-voltage cabinet 20b, and the third low-voltage cabinet 20c is provided with a second communication port 42. For example, the cabinet panel of the first low-voltage cabinet 20a facing the first box door 12 and the cabinet panel of the third low-voltage cabinet 20c facing the third box door 14 are both provided with a second communication port 42. In this way, when there is arc release at the second communication port 42, since the first box door 12 and the third box door 14 are in a closed state when the box-type substation 100 is powered on, the first box door 12 and the third box door 14 can play a role in blocking arc. In other embodiments, the second low-voltage cabinet 20b may also be provided with a second communication port 42 on the side facing the second box door 13.

[0063] Along the height direction Z of the box-type substation 100, the second connecting port 42 is located on the side of the first transverse partition 41 away from the circuit breaker 21. When the box-type substation 100 is in a powered-on state and the circuit breaker 21 of any one of the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c has an arc risk, part of the arc generated by the failure of the circuit breaker 21 needs to bypass part of the first transverse partition 41 before it can pass through the through hole and be released from the second connecting port 42. The setting of the first transverse partition 41 extends the release path of the arc from the second connecting port 42, so that the arc is continuously weakened during the release process, thereby reducing the arc hazard at the second connecting port 42.

[0064] In addition, the provision of the second connecting port 42 increases the channel for arc release in the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c, so that the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c form a low-voltage cabinet with a non-closed structure, thereby preventing arc explosion in a closed space.

[0065] When the cabinet panel of the first low-pressure cabinet 20a facing the first box door 12 and the cabinet panel of the third low-pressure cabinet 20c facing the third box door 14 are both provided with the first connecting port 40 and the second connecting port 42, the heat exchanger on the first box door 12 covers the first connecting port 40 and the second connecting port 42 of the first low-pressure cabinet 20a facing the first box door 12, and the heat exchanger on the third box door 14 covers the first connecting port 40 and the second connecting port 42 of the third low-pressure cabinet 20c facing the third box door 14. In this way, the two heat exchangers can input cooling air into the cabinet from the first connecting port 40 and then exhaust air from the second connecting port 42. The cooling air entering the first connecting port 40 can dissipate heat for the circuit breaker 21 more quickly. Due to the obstruction of the first transverse partition 41, the input cooling air exchanges heat with the circuit breaker 21 and is transported back to the heat exchanger through the through hole and the second connecting port 42 for cooling, so as to avoid the cooling air entering from the first connecting port 40 to go out directly from the second connecting port 42, and extend the path of the cooling air in the first low-voltage cabinet 20a and the second low-voltage cabinet 20b, thereby facilitating the improvement of the heat dissipation performance of the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c. In other embodiments, the two heat exchangers can input cooling air from the second connecting port 42 and then draw air from the first connecting port 40.

[0066] Please combine Figure 7 and Figure 8 , Figure 7 A schematic structural diagram of a first low-voltage cabinet 20a, a second low-voltage cabinet 20b, and a third low-voltage cabinet 20c from another perspective provided in an embodiment of the present application. Figure 8 for Figure 7Further, the box-type substation 100 further includes a first vertical partition 43, which is connected to a side of the first transverse partition 41 away from the circuit breaker 21 and extends along the height direction Z of the box-type substation 100 toward the second connecting port 42, and the first vertical partition 43 blocks at least a portion of the second connecting port 42. The first vertical partition 43 is arranged on the path where the arc is released from the second connecting port 42, and the first vertical partition 43 can further block the arc released from the second connecting port 42, further weaken the arc on this path, and reduce the possibility of the arc being released from the second connecting port 42.

[0067] Specifically, the first low-voltage cabinet 20a and the third low-voltage cabinet 20c are provided with a second connecting port 42, and the first vertical partition 43 is provided in the first low-voltage cabinet 20a and the third low-voltage cabinet 20c. The orthographic projection area of ​​the first vertical partition 43 along the length direction X of the box-type substation 100 is larger than the orthographic projection area of ​​the second connecting port 42 along the length direction X of the box-type substation 100, thereby enhancing the arc blocking effect of the first vertical partition 43. Among them, a plurality of small-diameter perforations are provided on the first vertical partition 43, and the plurality of perforations are used for cooling air to pass through, so as to realize ventilation and heat dissipation in the cabinet. The portion of the first vertical partition 43 that is not provided with perforations can effectively block the release of arcing, and the plurality of small-diameter perforations can play a role in weakening arcing.

[0068] In one embodiment, the box-type substation 100 further includes a second transverse partition 44 and a third connecting port 45. At least a portion of the second transverse partition 44 is disposed in the first low-voltage cabinet 20a and is arranged vertically with the cabinet panel of the first low-voltage cabinet 20a. Along the height direction Z of the box-type substation 100, a circuit breaker 21, a branch bar 22, a bus bar 23 and a first connecting port 40 are disposed between the second transverse partition 44 and the first transverse partition 41. A cable 25 is disposed on the side of the second transverse partition 44 away from the circuit breaker 21. The cable 25 is connected to the transformer 30. For example, the cable 25 can be connected to the transformer 30 through the bus bar 23. Along the height direction Z of the box-type substation 100, the third connecting port 45 is located on the side of the second transverse partition 44 away from the first connecting port 40.

[0069] Specifically, the second transverse partition 44 is provided through the first low voltage cabinet 20a, the second low voltage cabinet 20b and the third low voltage cabinet 20c, and the second transverse partition 44 is arranged in parallel with the first transverse partition 41. Similar to the first transverse partition 41, the second transverse partition 44 is also provided with a through hole for the cable 25 to pass through and connect to the busbar 23.

[0070] The circuit breaker 21 and the cable 25 are separated by the second transverse partition 44. When an arc fault occurs in the circuit breaker 21, the second transverse partition 44 can effectively prevent the arc from spreading to the cable 25, reduce the impact of the arc on the cable 25, and effectively reduce the possibility of the arc being released from the third connecting port 45.

[0071] The third connecting port 45 can be arranged on the side cabinet panel of at least one of the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c. For example, the third connecting port 45 is arranged on the first low-voltage cabinet 20a and the third low-voltage cabinet 20c. The cabinet panel of the first low-voltage cabinet 20a facing away from the second low-voltage cabinet 20b and the cabinet panel of the third low-voltage cabinet 20c facing away from the second low-voltage cabinet 20b are both provided with the third connecting port 45. For another example, the third connecting port 45 is arranged on the first, second and third low-voltage cabinets 20b and 20c, wherein the cabinet panel of the first low-voltage cabinet 20a facing away from the second low-voltage cabinet 20b, the cabinet panel of the third low-voltage cabinet 20c facing away from the second low-voltage cabinet 20b, and the cabinet panel of the second low-voltage cabinet 20b facing the second door 13 are all provided with the third connecting port 45. The third connecting port 45 is provided to increase the arc release passages of the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c, so that the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c form a low-voltage cabinet of a non-enclosed structure, preventing the arc from exploding in the enclosed space. When an arc fault occurs in the circuit breaker 21, the second transverse partition 44 can block the arc, weaken the arc released from the third connecting port 45, and thus reduce the arc hazard at the third connecting port 45.

[0072] The box-type substation 100 further includes a second vertical partition 46, which is disposed between the first low-voltage cabinet 20a and the second low-voltage cabinet 20b, or the second vertical partition 46 is disposed between the first low-voltage cabinet 20a and the third low-voltage cabinet 20c, such as the second vertical partition 46 is disposed in the second low-voltage cabinet 20b. The second vertical partition 46 extends along the height direction Z of the box-type substation 100, for example, the extension direction of the second vertical partition 46 can be parallel to the height direction Z of the box-type substation 100. The two opposite ends of the second vertical partition 46 along the height direction Z of the box-type substation 100 can be connected to the first transverse partition 41 and the second transverse partition 44 respectively, or the first transverse partition 41 is passed through one end of the second vertical partition 46 along the height direction Z of the box-type substation 100, and the second transverse partition 44 is passed through the other end of the second vertical partition 46 along the height direction Z of the box-type substation 100. Since the interiors of the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c are interconnected, arcing in any low-voltage cabinet can easily spread to other low-voltage cabinets. The second vertical partition 46 serves to block the spread of arcing, so as to reduce the mutual influence of arcing in the low-voltage cabinets on both sides of the second vertical partition 46, so that the low-voltage cabinets on both sides of the second vertical partition 46 can meet the requirements of arc fault test-arc level C. After cleaning the faulty components affected by arcing, each low-voltage cabinet can continue to operate, effectively reducing the losses caused by the shutdown of the box-type substation 100.

[0073] Please combine Fig. 9 and Fig.10 , Fig. 9A schematic diagram of the structure of the connection between the circuit breaker 21, the branch bar 22 and the bus bar 23 provided in one embodiment of the present application; Fig.10 for Fig. 9 The schematic diagram of the partial structure of the circuit breaker 21, the branch bar 22 and the bus bar 23 shown in the figure. In one embodiment, the box-type substation 100 further includes a mounting plate 47 and a third vertical partition 48, the mounting plate 47 is arranged between the first transverse partition 41 and the second transverse partition 44, and the mounting plate 47 is used to install the circuit breaker 21. The third vertical partition 48 is arranged between the branch bar 22 and the cabinet plate of the corresponding low-voltage cabinet, and the third vertical partition 48 is used to separate the branch bar 22 and the cabinet plate of the corresponding low-voltage cabinet.

[0074] Specifically, the mounting plate 47 extends along the height direction Z of the box-type substation 100, and the circuit breaker 21 and the busbar 23 are arranged on opposite sides of the mounting plate 47. The busbar 23 passes through the circuit breaker 21 and the transformer 30, and the busbar 23 and the circuit breaker 21 are connected through the branch bar 22. The mounting plate 47 separates the circuit breaker 21 and the busbar 23, and when the circuit breaker 21 or the busbar 23 generates arcing, the influence of arcing diffusion on the busbar 23 or the circuit breaker 21 can be reduced.

[0075] In the present application, one end of the busbar 23 in the first low-voltage cabinet 20a is connected to the transformer 30 and passes through the through hole on the first cross partition 41 to extend to the second low-voltage cabinet 20b. The busbar 23 in the third low-voltage cabinet 20c is connected to the transformer 30 and passes through the through hole of the first cross partition 41 to extend to the second low-voltage cabinet 20b. All busbars 23 extend from the side of the second low-voltage cabinet 20b away from the second box door 13 to be connected to the transformer 30.

[0076] The third vertical partition 48 and the mounting plate 47 are arranged in a row along the height direction Z of the box-type substation 100. The third vertical partition 48 is arranged between the branch row 22 in the first low-voltage cabinet 20a and the cabinet plate of the first low-voltage cabinet 20a, between the branch row 22 in the second low-voltage cabinet 20b and the cabinet plate of the second low-voltage cabinet 20b, and between the branch row 22 in the third low-voltage cabinet 20c and the cabinet plate of the third low-voltage cabinet 20c.

[0077] One end of the branch row 22 is connected to the circuit breaker 21, and the other end of the branch row 22 is connected to the busbar 23 after bypassing the mounting plate 47. Part of the branch row 22 is higher than the mounting plate 47, and the branch row 22 is directly exposed to the cabinet plate. By arranging the third vertical partition 48 between the branch row 22 and the cabinet plate relatively close thereto, when an arcing fault occurs in the branch row 22, the third vertical partition 48 can block the arcing, and the arcing is not easy to break through the cabinet plate of the first low-voltage cabinet 20a, the second low-voltage cabinet 20b or the third low-voltage cabinet 20c.

[0078] For example, the circuit breaker 21 in the second low-voltage cabinet 20b can be connected to the busbar 23 in the first low-voltage cabinet 20a through the branch row 22 and / or connected to the busbar 23 in the third low-voltage cabinet 20c through the branch row 22. For example, the circuit breaker 21 located on the side of the second vertical partition 46 facing the first low-voltage cabinet 20a is connected to the busbar 23 in the first low-voltage cabinet 20a through the branch row 22, and the circuit breaker 21 located on the side of the second vertical partition 46 facing the third low-voltage cabinet 20c is connected to the busbar 23 in the third low-voltage cabinet 20c through the branch row 22. In this way, the second vertical partition 46 can also effectively block the mutual influence between the busbars 23 on both sides and reduce the harm of arc spread.

[0079] In the present application, the mounting plate 47 and the third vertical partition 48 as a whole divide the space between the first horizontal partition 41 and the second vertical partition into two sub-spaces, one sub-space is used to accommodate the branch bar 22 and the bus bar 23, and the other sub-space is used to accommodate the circuit breaker 21, thereby achieving isolation between the branch bar 22 and the circuit breaker 21, and between the bus bar 23 and the circuit breaker 21.

[0080] There are multiple branch rows 22, and insulating partitions can be set between the multiple branch rows 22 to prevent arcing between adjacent branch rows 22. Furthermore, all busbars 23 and branch rows 22 are covered with heat shrink tubes to strengthen insulation protection and reduce the occurrence of arcing faults and the spread of arcing.

[0081] The interphase electrical clearance in the three low-voltage cabinets is greater than or equal to 25 mm, or the interphase electrical clearance can be greater than or equal to 30 mm, and the electrical distance relative to the ground is greater than or equal to 25 mm, thereby improving the safety performance in the low-voltage cabinet.

[0082] See also Fig.11 and Fig.12 , Fig.11 This is a schematic diagram of the structure of the cabinet door 26 from a perspective provided in an embodiment of the present application. Fig.12 for Fig.11The enlarged view at XII in the figure. The cabinet plate of the first low-voltage cabinet 20a facing the first side door 15, the cabinet plate of the second low-voltage cabinet 20b facing the second box door 13 and the cabinet plate of the third low-voltage cabinet 20c facing the second side door 16 are all set as cabinet doors 26, and the cabinet doors 26 include a first door plate 261 and a second door plate 262, which are respectively hinged to the cabinet frame 27 of the low-voltage cabinet, and at least one of the side of the first door plate 261 facing the second door plate 262 and the side of the second door plate 262 facing the first door plate 261 is provided with a blocking member 263, and when the first door plate 261 and the second door plate 262 are both in a closed state, at least part of the blocking member 263 blocks the gap between the first door plate 261 and the second door plate 262, so that a labyrinth structure is formed between the first door plate 261 and the second door plate 262 through the blocking member 263, which effectively prevents the arc from escaping from the gap between the first door plate 261 and the second door plate 262.

[0083] Please combine Fig.13 and Fig.14 , Fig.13 This is a schematic diagram of the structure of the cabinet door 26 from another perspective provided in an embodiment of the present application. Fig.14 The first door panel 261 and the second door panel 262 can be detachably connected to the cabinet frame 27 by adding a door lock 28 and / or a fixing frame 29 to strengthen the strength of the first door panel 261 and the second door panel 262.

[0084] In summary, in the box-type substation 100 of the present application, the cabinet panel of the first low-voltage cabinet 20a facing the first box door 12 and the cabinet panel of the third low-voltage cabinet 20c facing the third box door 14 are provided with a first connecting port 40 and a second connecting port 42 for large-area heat dissipation. When the operating component 24 of the inlet and outlet air duct (that is, the operating component 24 on the cabinet panel of the second low-voltage cabinet 20b facing the second box door 13) is operated, it is only necessary to open the second box door 13, and the first box door 12 and the third box door 14 remain closed. If an arcing fault occurs, the first connecting port 40 and the second connecting port 42 on the first low-voltage cabinet 20a and the third low-voltage cabinet 20c are blocked by the first box door 12 and the third box door 14, and the arcing cannot be released therefrom, and the cabinet panel of the first low-voltage cabinet 20a facing the first box door 12 and the cabinet panel of the third low-voltage cabinet 20c facing the third box door 14 can also block the arcing. When operating the operating components 24 without air inlet and outlet channels (i.e., the operating components 24 of the first low-voltage cabinet 20a toward the first side door 15 and the operating components 24 of the third low-voltage cabinet 20c toward the second side door 16), the first horizontal partition 41, the second horizontal partition 44, the first vertical partition 43, the second vertical partition 46, the third vertical partition 48, the mounting plate 47 and the cabinet plate can all block the arc, and it is not easy to cause harm to the operator.

[0085] When any one of the first box door 12 and the third box door 14 is in an open state, the sensor connected to the first box door 12 and the third box door 14 is triggered. The sensor transmits the trigger signal to a control module such as a relay or a measurement and control module, so that the first low-voltage cabinet 20a, the second low-voltage cabinet 20b and the third low-voltage cabinet 20c are forced to be powered off, thereby powering off the entire box-type substation 100 to cut off the occurrence of arcing.

[0086] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A box-type substation, characterized in that: It comprises a box, a first low-voltage cabinet and a transformer, the box accommodates the first low-voltage cabinet and the transformer, the box comprises a frame and a first box door, and the first box door is installed on the frame; The first low-voltage cabinet is used to connect the transformer and the power conversion equipment. A circuit breaker is arranged in the first low-voltage cabinet. The first low-voltage cabinet is arranged opposite to the first box door. The first low-voltage cabinet has a first connecting port on the cabinet panel facing the first box door. The first connecting port is used to dissipate heat for the circuit breaker and for arc release. When the first box door is in an open state, the box-type substation is in a power-off state.

2. The box-type substation according to claim 1, characterized in that: The box body also includes a second box door, which is connected to the frame body. The box-type substation also includes a second low-voltage cabinet, which is arranged in parallel with the first low-voltage cabinet. The interior of the second low-voltage cabinet is connected to the interior of the first low-voltage cabinet. The second low-voltage cabinet is arranged opposite to the second box door. The cabinet panel of the second low-voltage cabinet facing the second box door is provided with an operating component, and the operating component is connected to the electrical components in the second low-voltage cabinet. When the second box door is in an open state, the box-type substation is in a power-on state.

3. The box-type substation according to claim 1 or 2, characterized in that: The box-type substation also includes a first transverse partition, at least part of which is located in the first low-voltage cabinet and is vertically arranged with the cabinet panel of the first low-voltage cabinet, and the circuit breaker and the first connecting port are arranged on the same side of the first transverse partition along the height direction of the box-type substation.

4. The box-type substation according to claim 3, characterized in that: The box-type substation further includes a second communication port. Along the height direction of the box-type substation, the second communication port is located on a side of the first transverse partition away from the first communication port.

5. The box-type substation according to claim 3 or 4, characterized in that: The box-type substation also includes a first vertical partition, which is connected to a side of the first transverse partition away from the circuit breaker and extends along the height direction of the box-type substation toward the second connecting port, and the first vertical partition shields at least a portion of the second connecting port.

6. The box-type substation according to any one of claims 3 to 5, characterized in that: The box-type substation also includes a second transverse partition, at least a portion of which is arranged in the first low-voltage cabinet and is vertically arranged with the cabinet panel of the first low-voltage cabinet. Along the height direction of the box-type substation, the circuit breaker and the first connecting port are arranged between the second transverse partition and the first transverse partition, and a cable is arranged on the side of the second transverse partition away from the circuit breaker, and the cable is connected to the transformer.

7. The box-type substation according to claim 6, characterized in that: The box-type substation further includes a third communication port. Along the height direction of the box-type substation, the third communication port is located on a side of the second transverse partition away from the first communication port.

8. The box-type substation according to claim 6 or 7, characterized in that: The box-type substation further includes a second vertical partition, which is disposed between the first low-voltage cabinet and the second low-voltage cabinet, and extends along a height direction of the box-type substation.

9. The box-type substation according to any one of claims 6 to 8, characterized in that: The box-type substation also includes a mounting plate, which is arranged between the first transverse partition and the second transverse partition, and extends along the height direction of the box-type substation. The circuit breaker and the busbar are arranged on opposite sides of the mounting plate, and the busbar electrically connects the circuit breaker and the transformer.

10. The box-type substation according to claim 9, characterized in that: The box-type substation also includes a branch bar and a third vertical partition. The branch bar connects the circuit breaker and the bus bar. The branch bar is arranged opposite to the cabinet plate of the first low-voltage cabinet. The third vertical partition is arranged between the branch bar and the cabinet plate of the first low-voltage cabinet.

11. A photovoltaic system, characterized in that: The photovoltaic system includes a power conversion device and a box-type substation as described in any one of claims 1 to 10, wherein the power conversion device is used to convert direct current from photovoltaic components or energy storage batteries into alternating current, and output the alternating current to the box-type substation, and the box-type substation is used to boost the alternating current output by the power conversion device and output it to the power grid.

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