Substation and power supply system

Abstract

The embodiment of the invention discloses a transformer substation and a power supply system, and solves the problem of how to realize the transformer substation which is environment-friendly, high in current level, simple in structure and low in cost. The transformer substation comprises a first box body, and first insulating oil and a high-voltage distribution circuit immersed in the first insulating oil are arranged in the first box body. The output end of the low-voltage power distribution cabinet is connected with the input end of the transformer. The output end of the transformer is connected with the input end of the high-voltage power distribution circuit. The high-voltage distribution circuit comprises a first oil-immersed load switch, and an oil-immersed vacuum circuit breaker and a first oil-immersed three-position isolation switch which are connected in series. Wherein the oil-immersed vacuum circuit breaker and the first oil-immersed three-position isolating switch are arranged between the input end of the high-voltage distribution circuit and the first end of the first oil-immersed load switch, and the first end of the first oil-immersed load switch is connected with the output end of a transformer substation; and the second end of the first oil-immersed load switch is connected with the high-voltage input end of the transformer substation.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to a substation and a power supply system. Background Art

[0002] A photovoltaic power station usually includes a converter, a box-type substation and a booster station. The input end of the converter is connected to the photovoltaic array or energy storage device, the output end of the converter is connected to the low-voltage input end of the box-type substation, the output end of the box-type substation is connected to the input end of the booster station, and the output end of the booster station is used to connect to the power grid. The converter is used to convert the direct current output of the photovoltaic array or energy storage device into low-voltage alternating current, the box-type substation is used to convert the low-voltage alternating current into medium-voltage alternating current, and the booster station is used to convert the medium-voltage alternating current into high-voltage alternating current and transmit it to the power grid.

[0003] The box-type substation includes a container, a low-voltage distribution cabinet, a transformer and a ring main unit (RMU) arranged in the container. The ring main unit can also be called a ring main cabinet. The input end of the low-voltage distribution cabinet is connected to the low-voltage input end of the box-type substation, the output end of the low-voltage distribution cabinet is connected to the input end of the transformer (also called the primary side), the output end of the transformer (also called the secondary side) is connected to the input end of the ring main cabinet, and the output end of the ring main cabinet is connected to the output end of the box-type substation. The ring main cabinet uses sulfur hexafluoride (SF6) gas as an insulating medium for insulation and arc extinguishing, thereby ensuring that the ring main cabinet can operate safely and reliably.

[0004] However, SF6 gas is a strong greenhouse gas. Ring main units use SF6 gas for insulation and arc extinguishing, which poses environmental problems. At the same time, the ring main unit is a gas-sealed device with limited heat dissipation capacity, which will limit the current level that the ring main unit can handle. Secondly, the structure of the existing box-type substation is complex, which will lead to a high cost of the box-type substation. Therefore, how to achieve an environmentally friendly, high current level, simple structure, and low-cost substation has become an urgent problem to be solved. Summary of the invention

[0005] The embodiments of the present application provide a substation and a power supply system, which solve the problem of how to realize an environmentally friendly, high current level, simple structure, and low-cost substation.

[0006] In order to achieve the above purpose, the embodiment of the present application adopts the following technical solution:

[0007] In a first aspect of an embodiment of the present application, a first substation is provided, the first substation comprising a low-voltage distribution cabinet, a transformer and a first box, wherein a first insulating oil and a high-voltage distribution circuit immersed in the first insulating oil are arranged in the first box. The output end of the low-voltage distribution cabinet is connected to the input end of the transformer, and the output end of the transformer is connected to the input end of the high-voltage distribution circuit. The high-voltage distribution circuit comprises a first oil-immersed load switch and an oil-immersed vacuum circuit breaker and a first oil-immersed three-position disconnector connected in series. Among them, the oil-immersed vacuum circuit breaker and the first oil-immersed three-position disconnector are arranged between the input end of the high-voltage distribution circuit and the first end of the first oil-immersed load switch, the first end of the first oil-immersed load switch is connected to the output end of the first substation, the output end of the first substation is used to be connected to the input end of the booster station or the high-voltage input end of the second substation, the second end of the first oil-immersed load switch is connected to the high-voltage input end of the first substation, and the high-voltage input end of the first substation is used to be connected to the output end of the third substation.

[0008] Based on this solution, the first box and the high-voltage distribution circuit can realize the function of the ring network cabinet in the box-type substation in the prior art. However, compared with the ring network cabinet in the prior art, the first insulating oil is set in the first box, and the high-voltage distribution circuit is immersed in the first insulating oil. The first insulating oil can insulate and extinguish the high-voltage distribution circuit, so there is no environmental protection problem of the ring network cabinet using SF6 gas as the insulating medium. At the same time, the heat dissipation performance of the first insulating oil is better, and it will not limit the current level that the high-voltage distribution circuit can handle, nor will it limit the current level that the transformer connected to the high-voltage distribution circuit can handle, so it will not limit the current level that the first substation can handle as a whole, so that a substation with a high current level can be realized, and an environmentally friendly substation of more than 24KV can be realized, and the number of substations that can be connected when the first substation is networked hand in hand with other substations will not be limited. Secondly, there is no need to set up an indoor switch device ring network cabinet in the first substation, so there is no need to set up a container, and the structure of the first substation is simpler and the cost is lower.

[0009] In combination with the first aspect, in a possible implementation, the first substation further includes a second box, a first high-voltage bushing and a low-voltage bushing, the second box is provided with a second insulating oil, and the transformer is immersed in the second insulating oil. The first box is connected to the second box through the first high-voltage bushing, and the second box is connected to the low-voltage distribution cabinet through the low-voltage bushing.

[0010] Based on this solution, the first substation also includes a second box and a first high-voltage bushing, the second box is provided with a second insulating oil, and the transformer is immersed in the second insulating oil. The first box is connected to the second box through the first high-voltage bushing, and the first high-voltage bushing is arranged on the box wall where the first box and the second box are closely fitted. The first high-voltage bushing is used for the high-voltage circuit between the input end of the high-voltage distribution circuit and the coil on the secondary side of the transformer to pass through the first box and the second box, so that there is no need to arrange a high-voltage cable between the first box and the second box, which can reduce the volume of the first substation and reduce the cost of the first substation.

[0011] In combination with the first aspect, in a possible implementation, the first substation further includes a busbar connector and a second high-voltage bushing. The first box is connected to one end of the busbar connector through the first high-voltage bushing, and the second box is connected to the other end of the busbar connector through the second high-voltage bushing.

[0012] Based on this solution, the first substation also includes a busbar connector and a second high-voltage bushing. The above-mentioned first high-voltage bushing is arranged on the box wall of the first box, and the first high-voltage bushing is used for the high-voltage circuit between the input end of the high-voltage distribution circuit and one end of the busbar connector to pass through the first box. The second high-voltage bushing is arranged on the box wall of the second box, and the second high-voltage bushing is used for the high-voltage circuit between the coil on the secondary side of the transformer and the other end of the busbar connector to pass through the second box. By arranging the first high-voltage bushing, the busbar connector and the second high-voltage bushing, the first box and the second box can be two independent boxes, which is conducive to assembly and maintenance, and the heat dissipation area of ​​the first box and the second box can be increased, and the heat dissipation capacity of the first box and the second box can be improved, thereby improving the stability of the first substation.

[0013] In combination with the first aspect, in a possible implementation, the first substation further includes a third high-voltage bushing and a fourth high-voltage bushing. A first end of the first oil-immersed load switch is connected to one end of the third high-voltage bushing, the other end of the third high-voltage bushing is connected to an output end of the first substation, a second end of the first oil-immersed load switch is connected to one end of the fourth high-voltage bushing, and the other end of the fourth high-voltage bushing is connected to a high-voltage input end of the first substation.

[0014] Based on this solution, the first end of the first oil-immersed load switch is connected to the output end of the first substation through the third high-voltage bushing, and the second end of the first oil-immersed load switch is connected to the high-voltage input end of the first substation through the fourth high-voltage bushing. Since the high-voltage bushing has good electrical insulation performance, the safe transmission of high-voltage current can be ensured, thereby improving the safety and reliability of the first substation.

[0015] In combination with the first aspect, in a possible implementation, the first substation further includes an oil pillow and a first pipeline, and the oil pillow is connected to the first box through the first pipeline.

[0016] Based on this solution, the first substation also includes an oil pillow and a first pipeline. The oil pillow is connected to the first box through the first pipeline. When the volume of the first insulating oil in the first box expands or shrinks with the change of oil temperature, the oil pillow is used to adjust the amount of the first insulating oil in the first box. The oil pillow is specifically used to store the first insulating oil that expands in the first box or to replenish the first insulating oil in the first box, so as to ensure the safe and reliable operation of the first substation. At the same time, the first insulating oil in the oil pillow has good thermal conductivity. The oil pillow can also be used to transfer the heat in the first box to the outside of the oil pillow to achieve the cooling of the first box, which can ensure the safe and reliable operation of the first substation.

[0017] In combination with the first aspect, in a possible implementation, the first substation further includes a second pipeline, and the oil pillow is connected to the second box through the second pipeline.

[0018] Based on this solution, the oil pillow is connected to the second box through the second pipe. When the volume of the second insulating oil in the second box expands or shrinks with the change of oil temperature, the oil pillow is used to adjust the amount of the second insulating oil in the second box. The oil pillow is specifically used to store the second insulating oil that expands in the second box or to replenish the second insulating oil in the second box, so as to ensure the safe and reliable operation of the first substation. At the same time, the second insulating oil in the oil pillow has good thermal conductivity. The oil pillow can also be used to transfer the heat in the second box to the outside of the oil pillow to achieve the cooling of the second box, which can ensure the safe and reliable operation of the first substation. And the first box and the second box share the oil pillow, which can reduce the cost of the first substation.

[0019] In combination with the first aspect, in a possible implementation manner, the first substation further includes a valve, and the valve is arranged on the first pipeline.

[0020] Based on this solution, by controlling the valve to close and cutting off the connection between the first box and the oil pillow, the high-voltage distribution circuit in the first box can continue to work, and the first substation can continue to be networked hand in hand with other substations. At the same time, the second box or the transformer in the second box can be maintained separately without the need to shut down the first substation as a whole to maintain the second box or the transformer in the second box, which can reduce the downtime of the first substation.

[0021] In combination with the first aspect, in a possible implementation, the high-voltage distribution circuit also includes a second oil-immersed load switch, one end of the second oil-immersed load switch is connected to the first end of the first oil-immersed load switch, and the other end of the second oil-immersed load switch is connected to the output end of the first substation.

[0022] Based on this scheme, by setting up a second oil-immersed load switch, it can be ensured that in the event of a failure of the first oil-immersed load switch, the second oil-immersed load switch can disconnect the circuit between the high-voltage input end of the first substation and the output end of the first substation, thereby improving the reliability of the first substation.

[0023] In combination with the first aspect, in a possible implementation, the oil-immersed load switch includes: an oil-immersed three-position load switch, or an oil-immersed vacuum load switch and a second oil-immersed three-position isolating switch connected in series.

[0024] Based on this scheme, compared with the oil-immersed three-position load switch, the oil-immersed vacuum load switch adopts a vacuum arc extinguishing mechanism, which will not pollute the first insulating oil, and has a strong load breaking capacity, a high breaking number and a long service life, which can improve the reliability of the first substation.

[0025] According to a second aspect of an embodiment of the present application, a power supply system is provided, which includes a converter and a first substation, wherein the input end of the converter is used to be connected to an energy storage device or a photovoltaic array, the output end of the converter is connected to a low-voltage input end of the first substation, the output end of the first substation is used to be connected to an input end of a booster station or a high-voltage input end of a second substation, the high-voltage input end of the first substation is used to be connected to an output end of a third substation, and the first substation is the first substation as described in the above-mentioned first aspect or any possible implementation of the first aspect.

[0026] The description of the second aspect in this application can refer to the detailed description of the first aspect; and the beneficial effects of the second aspect can refer to the analysis of the beneficial effects of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A circuit topology diagram of a power supply system;

[0028] Figure 2 It is a circuit topology diagram of a box-type substation;

[0029] Figure 3 A schematic diagram of an application scenario of a first substation provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of a circuit topology of a first substation provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of another circuit topology of a first substation provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of a circuit topology of another first substation provided in an embodiment of the present application;

[0033] Figure 7 A schematic diagram of circuit topology of another first substation provided in an embodiment of the present application;

[0034] Figure 8 A schematic diagram of the structure of a first substation provided in an embodiment of the present application;

[0035] Fig. 9 A schematic diagram of the structure of another first substation provided in an embodiment of the present application;

[0036] Fig.10 A structural schematic diagram of another first substation provided in an embodiment of the present application;

[0037] Fig.11 A structural schematic diagram of another first substation provided in an embodiment of the present application;

[0038] Fig.12 A structural schematic diagram of another first substation provided in an embodiment of the present application;

[0039] Fig.13 A structural schematic diagram of another first substation provided in an embodiment of the present application;

[0040] Fig.14 A schematic diagram of circuit topology of another first substation provided in an embodiment of the present application;

[0041] Fig.15 A schematic diagram of circuit topology of another first substation provided in an embodiment of the present application;

[0042] Fig.16 A structural schematic diagram of another first substation provided in an embodiment of the present application;

[0043] Fig.17 A structural schematic diagram of another first substation provided in an embodiment of the present application;

[0044] Fig.18 A structural schematic diagram of another first substation provided in an embodiment of the present application;

[0045] Fig.19 A structural schematic diagram of another first substation provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] The following will discuss the making and use of each embodiment in detail. However, it should be understood that many applicable inventive concepts provided by this application can be implemented in a variety of specific environments. The specific embodiments discussed are only used to illustrate the specific ways to implement and use this description and this technology, and do not limit the scope of this application.

[0047] Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art.

[0048] Various circuits or other components may be described or referred to as being "configured to" perform one or more tasks. In this case, "configured to" is used to imply structure by indicating that the circuit / component includes structure (e.g., circuitry) that performs the one or more tasks during operation. Thus, even when the specified circuit / component is not currently operational (e.g., not turned on), the circuit / component may be referred to as being configured to perform the task. Circuits / components used with the phrase "configured to" include hardware, such as circuits that perform an operation, etc.

[0049] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. In the present application, "multiple" means two or more. The character " / " generally indicates that the objects before and after are in an "or" relationship. The words "first", "second", etc. do not limit the quantity and order.

[0050] In this application, the words "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the words "exemplary" or "for example" is intended to present the related concepts in a concrete way.

[0051] In this application, "low voltage", "medium voltage" and "high voltage" are relative concepts and are not limitations on the voltage range. "Low voltage", "medium voltage" and "high voltage" cannot be understood as limitations on the voltage range of this application.

[0052] Before introducing the embodiments of the present application, the relevant technologies involved in the present application are first introduced.

[0053] like Figure 1The figure shows a circuit topology diagram of a power supply system 100. The power supply system 100 can be applied to a photovoltaic power station, and the power supply system 100 includes a converter 110 and a box-type transformer substation 120. The input end of the converter 110 is used to connect to the output end of the energy storage device or the photovoltaic array 200, the output end of the converter 110 is connected to the low-voltage input end of the box-type transformer substation 120, the output end of the box-type transformer substation 120 is used to connect to the input end of the booster station 300, and the output end of the booster station 300 is used to connect to the power grid 400. In the case where the input end of the converter 110 is used to connect to the energy storage device, the converter 110 can be a power storage converter (power conversion system, PCS), the converter 110 is used to convert the direct current output of the energy storage device into alternating current, and transmit it to the box-type transformer substation 120, or, convert the alternating current output of the box-type transformer substation 120 into direct current, and transmit it to the energy storage device, the power supply system 100 can be called an energy storage power supply system. In the case where the input end of the converter 110 is used to connect to a photovoltaic array, the converter 110 may be a photovoltaic inverter, and the converter 110 is used to convert the direct current output by the photovoltaic array into alternating current, and transmit it to the box-type substation 120. The power supply system 100 may be referred to as a photovoltaic power supply system. In the case where the power supply system 100 includes a plurality of converters 110, and the input ends of some of the converters 110 are used to connect to an energy storage device, and the input ends of the remaining converters 110 are used to connect to a photovoltaic array, the power supply system 100 may be referred to as a photovoltaic storage power supply system.

[0054] Among them, the converter 110 is used to convert the direct current output by the energy storage device or the photovoltaic array 200 into low-voltage alternating current, the box-type substation 120 is used to convert the low-voltage alternating current into medium-voltage alternating current, and the booster station 300 is used to convert the medium-voltage alternating current into high-voltage alternating current and transmit it to the power grid 400.

[0055] like Figure 2The circuit topology diagram of a box-type transformer substation 120 is shown. The box-type transformer substation 120 includes a container 121, and a low-voltage distribution cabinet 122, a low-voltage bushing L, an oil-immersed transformer 123, a first high-voltage bushing B1, a second high-voltage bushing B2, a ring network cabinet 124, a third high-voltage bushing B3 and a fourth high-voltage bushing B4 arranged in the container 121. The input end of the low-voltage distribution cabinet 122 is connected to the low-voltage input end of the box-type transformer substation 120, and the output end of the low-voltage distribution cabinet 122 is connected to the input end of the oil-immersed transformer 123 through the low-voltage bushing L. The output end of the oil-immersed transformer 123 is connected to one end of the first high-voltage bushing B1, the other end of the first high-voltage bushing B1 is connected to one end of the second high-voltage bushing B2, and the other end of the second high-voltage bushing B2 is connected to the input end of the ring network cabinet 124. The ring main unit 124 is connected to the output end of the box-type substation 120 through the third high-voltage bushing B3 and the high-voltage cable. The output end of the box-type substation 120 is used to be connected to the input end of the booster station 300 or the high-voltage input end of the first box-type substation through the high-voltage cable. The ring main unit 124 can also be connected to the high-voltage input end of the box-type substation 120 through the fourth high-voltage bushing B4 and the high-voltage cable. The high-voltage input end of the box-type substation 120 is used to be connected to the output end of the second box-type substation through the high-voltage cable, so that the box-type substation 120 can realize hand-in-hand networking.

[0056] The high-voltage bushing is a device that allows high-voltage circuits to pass through partitions such as walls or boxes, and plays an insulating and supporting role. In this application, the device that allows low-voltage circuits to pass through partitions such as walls or boxes, and plays an insulating and supporting role is called a low-voltage bushing.

[0057] In one example, referring to Figure 2The low-voltage distribution cabinet 122 includes a frame circuit breaker (ACB) 1221 and a plurality of molded case circuit breakers (MCCB) 1222. One end of the plurality of molded case circuit breakers 1222 is connected to the input end of the low-voltage distribution cabinet 122 and then connected to the output ends of the plurality of converters 110 respectively. The other end of the plurality of molded case circuit breakers 1222 is connected to one end of the frame circuit breaker 1221, and the other end of the frame circuit breaker 1221 is connected to the output end of the low-voltage distribution cabinet 122. Both the frame circuit breaker 1221 and the molded case circuit breaker 1222 are mechanical switch electrical appliances, which can be used to connect, carry and disconnect current under normal circuit conditions, and can also be used to connect, carry for a certain time and disconnect current under specified abnormal circuit conditions. The size and volume of the molded case circuit breaker 1222 is small and used in lower current scenarios, such as residential or commercial buildings, and the size and volume of the frame circuit breaker 1221 is large and used in higher current scenarios, such as large industrial facilities. The molded case circuit breaker 1222 and the frame circuit breaker 1221 can be used in combination, for example, the output ends of multiple molded case circuit breakers 1222 can be connected to the input end of one frame circuit breaker 1221.

[0058] Continue to refer to Figure 2 The oil-immersed transformer 123 includes an oil tank 1231 and an oil pillow 1232. The oil tank 1231 and the oil pillow 1232 are connected through a pipeline 1233. The oil tank 1231 is provided with transformer oil, and a transformer T immersed in the transformer oil. The coil on the primary side of the transformer T is connected to the input end of the oil-immersed transformer 123, and the coil on the secondary side of the transformer T is connected to the output end of the oil-immersed transformer 123.

[0059] Continue to refer to Figure 2The ring main unit 124 is a group of electrical equipment (high voltage switchgear) installed in a metal or non-metallic insulating cabinet or made into an assembled interval ring main unit. The core part adopts load switches and fuses, which have the advantages of simple structure, small size, low price, improved power supply parameters and performance, and power supply safety. The ring main unit 124 includes a box 1241, in which SF6 gas is arranged, as well as a vacuum circuit breaker (VCB) 1242, a three-position disconnector 1243, a first three-position load switch 1244, and a second three-position load switch 1245. One end of the vacuum circuit breaker 1242 is connected to the input end of the ring main unit 124, the other end of the vacuum circuit breaker 1242 is connected to one end of the three-position isolating switch 1243, the other end of the three-position isolating switch 1243 is connected to one end of the first three-position load switch 1244 and one end of the second three-position load switch 1245, the other end of the first three-position load switch 1244 is connected to the output end of the box-type substation 120 through the third high-voltage bushing B3, and the other end of the second three-position load switch 1245 is connected to the high-voltage input end of the box-type substation 120 through the fourth high-voltage bushing B4. At this time, the ring main unit 124 can be called a CVC type ring main unit. Compared with the CVC type ring main unit, when the ring main unit 124 includes the second three-position load switch 1245 but does not include the first three-position load switch 1244, and the other end of the three-position disconnector 1243 is directly connected to the output end of the box-type substation 120 through the third high-voltage bushing B3, the ring main unit 124 can be called a DVC type ring main unit. By setting SF6 gas in the ring main unit 124 and using SF6 gas as an insulating medium for insulation and arc extinguishing, the safe and reliable operation of the ring main unit 124 can be ensured.

[0060] The arc extinguishing medium of the vacuum circuit breaker 1242 and the insulating medium of the contact gap after arc extinguishing are both high vacuum, which has the advantages of small size, light weight, suitable for frequent operation, and arc extinguishing without maintenance. In the following embodiments of the present application, the vacuum circuit breaker that can be immersed in insulating oil is called an oil-immersed vacuum circuit breaker.

[0061] A three-position switchgear (3PS) refers to a switch with a closing position, an opening position and a grounding position. The three-position switch may include the above-mentioned three-position isolating switch 1243 and a three-position load switch (1244 or 1245). Among them, the three-position isolating switch is used to isolate the power supply to ensure that the circuit is in a safe state during maintenance or overhaul. Isolation indicates that the circuit has been disconnected, and also indicates that the break between the power side and the load side is large. The three-position load switch is used to cut off and protect the load current in the circuit, including overload and short-circuit protection. Cutting off indicates that the circuit has been disconnected and the load has been removed. In this application, a three-position isolating switch that can be immersed in insulating oil is referred to as an oil-immersed three-position isolating switch, and a three-position load switch that can be immersed in insulating oil is referred to as an oil-immersed three-position load switch.

[0062] A load switch is a switching device between a circuit breaker and an isolating switch. It is generally equipped with a simple arc extinguishing device, can open and close circuits with load, can switch on and off a certain load current and overload current, but cannot disconnect short-circuit current. In this application, a load switch that can be immersed in insulating oil is referred to as an oil-immersed load switch, which can include the above-mentioned oil-immersed three-position load switch. The load switch can also include a vacuum load switch, which uses a vacuum medium to extinguish arcs, has a strong load breaking capacity, a high breaking frequency and a long service life. In this application, a vacuum load switch that can be immersed in insulating oil is referred to as an oil-immersed vacuum load switch.

[0063] However, SF6 gas is a strong greenhouse gas. The ring main unit 124 uses SF6 gas for insulation and arc extinguishing, which has environmental problems. When the box-type substation 120 is used at high altitudes, the insulation and gas leakage problems of the ring main unit 124 are prominent, which will lead to poor reliability and poor environmental protection of the box-type substation 120. At the same time, the ring main unit 124 is a gas-sealed device with limited heat dissipation capacity, which will limit the current level that the ring main unit 124 can handle. For example, the current level that the ring main unit 124 can handle is 630A, which will also limit the current level that the oil-immersed transformer 123 connected to the ring main unit 124 can handle. Therefore, the current level that the box-type substation 120 can handle as a whole will be limited, and the number of box-type substations that can be connected when the box-type substation 120 is networked hand in hand with other box-type substations will be limited. Secondly, the ring main unit 124 is an indoor switch cabinet device. The box-type substation 120 needs to be equipped with a container 121. Setting the ring main unit 124 in the container 121 will lead to a complex structure and high cost of the box-type substation 120. Therefore, how to achieve environmental protection, high current level, simple structure, and low-cost substation has become an urgent problem to be solved. In addition, there is currently no environmental protection solution for box-type substations above 24KV, so how to achieve environmental protection for substations above 24KV has also become an urgent problem to be solved.

[0064] Based on this, the embodiment of the present application provides a substation, in which insulating oil is used as the insulating medium for insulation and arc extinguishing, instead of SF6 gas for insulation and arc extinguishing, so as to solve the environmental protection problem. At the same time, compared with the ring network cabinet 124 which is a gas-sealed device with limited heat dissipation capacity, the heat dissipation performance of insulating oil is better, and it will not limit the current level that the substation can handle, so that a substation with a high current level can be realized, and an environmentally friendly substation above 24KV can be realized. Secondly, the substation does not need to set up an indoor switch device ring network cabinet 124, and does not need to set up a container 121. The structure of the substation is simpler and the cost is lower.

[0065] like Figure 3 As shown in (a), it is a circuit topology diagram of an application scenario of a first substation 500 provided in an embodiment of the present application. The first substation 500 can be applied to a power supply system 600, which can be applied to a photovoltaic power station. The power supply system 600 also includes a converter 610, the input end of the converter 610 is used to connect to the output end of the energy storage device or the photovoltaic array 200, the output end of the converter 610 is connected to the low-voltage input end of the first substation 500, and the output end of the first substation 500 is used to connect to the input end of the booster station 300.

[0066] Among them, the converter 610 is used to convert the direct current output by the energy storage device or the photovoltaic array 200 into low-voltage alternating current, the first substation 500 is used to convert the low-voltage alternating current into medium-voltage alternating current, and the booster station 300 is used to convert the medium-voltage alternating current into high-voltage alternating current and transmit it to the power grid 400.

[0067] In a possible embodiment, Figure 3 As shown in (b), it is a circuit topology diagram of another application scenario of the first substation 500 provided in the embodiment of the present application, the output end of the first substation 500 is used to connect with the high-voltage input end of the second substation 700, the output end of the second substation 700 is connected with the input end of the booster station 300, and the high-voltage input end of the first substation 500 is used to connect with the output end of the third substation 800, so that the second substation 700, the first substation 500 and the third substation 800 can be networked hand in hand. Among them, the second substation 700 and the third substation 800 can be the same substation as the first substation 500 provided in the embodiment of the present application, or can be a box-type substation, such as the box-type substation 120 described above. The embodiment of the present application does not limit this. The embodiment of the present application takes the second substation 700 and the third substation 800 as the substations that are the same as the first substation 500 provided in the embodiment of the present application as an example for exemplary description.

[0068] In a possible embodiment, when the input end of the converter 610 is used to connect to the photovoltaic array, the converter 610 may be a photovoltaic inverter, and the converter 610 is used to convert the direct current output by the photovoltaic array into alternating current, and transmit it to the first substation 500. The power supply system 600 may be referred to as a photovoltaic power supply system. When the input end of the converter 610 is used to connect to the energy storage device, the converter 610 may be an energy storage converter, and the converter 610 is used to convert the direct current output by the energy storage device into alternating current, and transmit it to the first substation 500, or convert the alternating current output by the first substation 500 into direct current, and transmit it to the energy storage device. The power supply system 600 may be referred to as an energy storage power supply system. When the power supply system 600 includes multiple converters 610, where the input ends of some converters 610 are used to connect to energy storage devices and the input ends of other converters 610 are used to connect to photovoltaic arrays, the power supply system 600 can be called a photovoltaic power supply system.

[0069] like Figure 4 , which is a schematic diagram of a circuit topology of a first substation 500 provided in an embodiment of the present application. The first substation 500 includes a low-voltage distribution cabinet 510, a transformer 520, and a first box 530, wherein the first box 530 is provided with a first insulating oil and a high-voltage distribution circuit 540 immersed in the first insulating oil.

[0070] Reference Figure 4 The input end of the low-voltage distribution cabinet 510 is connected to the low-voltage input end of the first substation 500, the output end of the low-voltage distribution cabinet 510 is connected to the input end of the transformer 520, and the output end of the transformer 520 is connected to the input end of the high-voltage distribution circuit 540. The high-voltage distribution circuit 540 includes a first oil-immersed load switch 541 and an oil-immersed vacuum circuit breaker 542 and a first oil-immersed three-position disconnector 543 connected in series. Among them, the oil-immersed vacuum circuit breaker 542 and the first oil-immersed three-position disconnector 543 are arranged between the input end of the high-voltage distribution circuit 540 and the first end of the first oil-immersed load switch 541, and the first end of the first oil-immersed load switch 541 is connected to the output end of the first substation 500, refer to Figure 3 (a) and Figure 3 (b), the output end of the first substation 500 is used to connect to the input end of the booster station 300 or the high-voltage input end of the second substation 700, and the second end of the first oil-immersed load switch 541 is connected to the high-voltage input end of the first substation 500, referring to Figure 3 In (b), the high voltage input terminal of the first substation 500 is used to connect to the output terminal of the third substation 800.

[0071] In a possible embodiment, the oil-immersed vacuum circuit breaker 542 and the first oil-immersed three-position disconnector 543 connected in series are arranged between the input end of the high-voltage distribution circuit 540 and the first end of the first oil-immersed load switch 541, including: Figure 4 , one end of the oil-immersed vacuum circuit breaker 542 is connected to the input end of the high-voltage power distribution circuit 540, the other end of the oil-immersed vacuum circuit breaker 542 is connected to one end of the first oil-immersed three-position disconnector 543, and the other end of the first oil-immersed three-position disconnector 543 is connected to the first end of the first oil-immersed load switch 541. Or, as Figure 5 As shown in (a), one end of the first oil-immersed three-position disconnector 543 is connected to the input end of the high-voltage distribution circuit 540, the other end of the first oil-immersed three-position disconnector 543 is connected to one end of the oil-immersed vacuum circuit breaker 542, and the other end of the oil-immersed vacuum circuit breaker 542 is connected to the first end of the first oil-immersed load switch 541. The embodiment of the present application does not limit the specific series connection sequence of the oil-immersed vacuum circuit breaker 542 and the first oil-immersed three-position disconnector 543.

[0072] In a possible embodiment, the first insulating oil includes mineral insulating oil, silicone oil, or vegetable oil, etc. The embodiment of the present application does not limit the specific type of the first insulating oil.

[0073] In a possible embodiment, Figure 4 As shown, the first oil-immersed load switch 541 includes an oil-immersed three-position load switch 5411, or, as shown Figure 5 As shown in (a), the first oil-immersed load switch 541 includes an oil-immersed vacuum load switch 5412 and a second oil-immersed three-position isolating switch 5413 connected in series, which is not limited in the present embodiment. Compared with the oil-immersed three-position load switch 5411, the oil-immersed vacuum load switch 5412 adopts a vacuum arc extinguishing mechanism, which will not pollute the first insulating oil, and has a strong load breaking capacity, a high breaking number and a long service life, which can improve the reliability of the first substation 500.

[0074] In a possible embodiment, when the first oil-immersed load switch 541 includes an oil-immersed vacuum load switch 5412 and a second oil-immersed three-position isolating switch 5413 connected in series, Figure 5 As shown in (a), one end of the oil-immersed vacuum load switch 5412 is connected to the first end of the first oil-immersed load switch 541, the other end of the oil-immersed vacuum load switch 5412 is connected to one end of the second oil-immersed three-position isolating switch 5413, and the other end of the second oil-immersed three-position isolating switch 5413 is connected to the second end of the first oil-immersed load switch 541. Or, as Figure 5As shown in (b), one end of the second oil-immersed three-position disconnector 5413 is connected to the first end of the first oil-immersed load switch 541, the other end of the second oil-immersed three-position disconnector 5413 is connected to one end of the oil-immersed vacuum load switch 5412, and the other end of the oil-immersed vacuum load switch 5412 is connected to the second end of the first oil-immersed load switch 541. The embodiment of the present application does not limit the specific series connection sequence of the oil-immersed vacuum load switch 5412 and the second oil-immersed three-position disconnector 5413.

[0075] In a possible embodiment, the first substation 500 provided in the embodiment of the present application can be applied to a charging station (also referred to as a new energy charging station). When the first substation 500 is applied to a charging station, the current flowing through the oil-immersed vacuum circuit breaker 542 and the first oil-immersed three-position disconnector 543 in the high-voltage distribution circuit 540 is relatively small, for example, several tens of amperes, so the selection requirements of the oil-immersed vacuum circuit breaker 542 and the first oil-immersed three-position disconnector 543 can be reduced, thereby reducing the cost of the first substation 500. The ring main unit 124 in the above-mentioned box-type substation 120 is a medium-voltage standardized distribution device. When the box-type substation 120 is applied to a charging station, the selection of the device is not optimized, which will result in a higher cost of the box-type substation 120.

[0076] In a possible embodiment, Figure 4 As shown, the low-voltage power distribution cabinet 510 includes a plastic case circuit breaker 511 and a frame circuit breaker 512, one end of the plastic case circuit breaker 511 is connected to the input end of the low-voltage power distribution cabinet 510 and then connected to the output end of the converter 610, the other end of the plastic case circuit breaker 511 is connected to one end of the frame circuit breaker 512, and the other end of the frame circuit breaker 512 is connected to the output end of the low-voltage power distribution cabinet 510. The embodiment of the present application does not limit the specific number of plastic case circuit breakers 511 and the specific number of frame circuit breakers 512 included in the low-voltage power distribution cabinet 510.

[0077] For example, Figure 5 As shown in (a), it is a schematic diagram of a circuit topology of a first substation 500 provided in an embodiment of the present application. The low-voltage power distribution cabinet 510 may include a frame-type circuit breaker 512 and a plurality of plastic case circuit breakers 511. One end of the plurality of plastic case circuit breakers 511 is connected to the output end of the low-voltage power distribution cabinet 510 and then connected to the output ends of the plurality of converters 610 respectively, and the other end of the plurality of plastic case circuit breakers 511 is connected to one end of the frame-type circuit breaker 512, and the other end of the frame-type circuit breaker 512 is connected to the coil on the primary side of the transformer 520.

[0078] For example, Figure 5As shown in (b), it is a schematic diagram of a circuit topology of a first substation 500 provided in an embodiment of the present application. The low-voltage power distribution cabinet 510 may include a plurality of plastic case circuit breakers 511 and two frame circuit breakers 512, one end of the plurality of plastic case circuit breakers 511 is connected to the output end of the low-voltage power distribution cabinet 510 and then respectively connected to the output ends of the plurality of converters 610, the other end of a part of the plurality of plastic case circuit breakers 511 is connected to one end of a frame circuit breaker 512, the other end of the remaining part of the plurality of plastic case circuit breakers 511 is connected to one end of another frame circuit breaker 512, and the other ends of the two frame circuit breakers 512 are respectively connected to the two coils on the primary side of the transformer 520.

[0079] In the first substation 500 provided in the embodiment of the present application, the first box 530 and the high-voltage distribution circuit 540 can realize the function of the ring network cabinet 124 in the above-mentioned box-type substation 120. However, compared with the above-mentioned ring network cabinet 124, the present application sets the first insulating oil in the first box 530, and the high-voltage distribution circuit 540 is immersed in the first insulating oil. The first insulating oil can insulate and extinguish the high-voltage distribution circuit 540, so there is no environmental protection problem of the ring network cabinet 124 using SF6 gas as the insulating medium. At the same time, the heat dissipation performance of the first insulating oil is better, and it will not limit the current level that the high-voltage distribution circuit 540 can handle, nor will it limit the current level that the transformer 520 connected to the high-voltage distribution circuit 540 can handle, so it will not limit the current level that the first substation 500 can handle as a whole, so that a high-current level first substation 500 can be realized, and an environmentally friendly first substation 500 of more than 24KV can be realized, and the number of substations that can be connected when the first substation 500 is networked hand in hand with other substations will not be limited. Secondly, the first substation 500 does not need to be equipped with an indoor switch device ring main cabinet 124, so there is no need to install a container 121. The structure of the first substation 500 is simpler and the cost is lower.

[0080] In a possible embodiment, Figure 6 As shown, the first transformer substation 500 further includes a second box 550, a first high-voltage bushing B1 and a low-voltage bushing L. The second box 550 is provided with a second insulating oil, and the transformer 520 is immersed in the second insulating oil. The first box 530 is connected to the second box 550 through the first high-voltage bushing B1, and the second box 550 is connected to the low-voltage distribution cabinet 510 through the low-voltage bushing L.

[0081] Specifically, refer to Figure 6The first box 530 and the second box 550 are connected through the first high-voltage bushing B1, including: the input end of the high-voltage distribution circuit 540 in the first box 530 is connected to one end of the first high-voltage bushing B1, and the coil on the secondary side of the transformer 520 in the second box 550 is connected to the other end of the first high-voltage bushing B1.

[0082] Reference Figure 6 The second box 550 is connected to the low-voltage distribution cabinet 510 through a low-voltage bushing L, including: the coil on the primary side of the transformer 520 in the second box 550 is connected to one end of the low-voltage bushing L, and the other end of the low-voltage bushing L is connected to the input end of the low-voltage distribution cabinet 510.

[0083] In a possible embodiment, the second insulating oil includes mineral insulating oil, silicone oil or vegetable oil, etc., and the embodiment of the present application does not limit the specific type of the second insulating oil. The type of the second insulating oil may be the same as or different from the type of the first insulating oil, and the embodiment of the present application does not limit this.

[0084] The first transformer substation 500 provided in the embodiment of the present application further includes a second box 550 and a first high-voltage bushing B1. The second insulating oil is arranged in the second box 550, and the transformer 520 is immersed in the second insulating oil. The first box 530 and the second box 550 are connected through the first high-voltage bushing B1, and the first high-voltage bushing B1 is arranged on the box wall where the first box 530 and the second box 550 are closely fitted. The first high-voltage bushing B1 is used for the high-voltage circuit between the input end of the high-voltage distribution circuit 540 and the coil on the secondary side of the transformer 520 to pass through the first box 530 and the second box 550, so that there is no need to arrange a high-voltage cable between the first box 530 and the second box 550, which can reduce the volume of the first transformer substation 500 and reduce the cost of the first transformer substation 500.

[0085] In a possible embodiment, Figure 7 As shown, the first substation 500 further includes a busbar connector 560 and a second high-voltage bushing B2. The first box 530 is connected to one end of the busbar connector 560 through the first high-voltage bushing B1, and the second box 550 is connected to the other end of the busbar connector 560 through the second high-voltage bushing B2.

[0086] Specifically, refer to Figure 7The first box 530 is connected to one end of the busbar connector 560 through the first high-voltage bushing B1, and the second box 550 is connected to the other end of the busbar connector 560 through the second high-voltage bushing B2, including: the input end of the high-voltage distribution circuit 540 in the first box 530 is connected to one end of the first high-voltage bushing B1, the other end of the first high-voltage bushing B1 is connected to one end of the busbar connector 560, the coil on the secondary side of the transformer 520 in the second box 550 is connected to one end of the second high-voltage bushing B2, and the other end of the second high-voltage bushing B2 is connected to the other end of the busbar connector 560.

[0087] In one possible embodiment, referring to Figure 6 or Figure 7 The first substation 500 further includes a third high-voltage bushing B3 and a fourth high-voltage bushing B4. A first end of the first oil-immersed load switch 541 is connected to one end of the third high-voltage bushing B3, and the other end of the third high-voltage bushing B3 is connected to the output end of the first substation 500. A second end of the first oil-immersed load switch 541 is connected to one end of the fourth high-voltage bushing B4, and the other end of the fourth high-voltage bushing B4 is connected to the high-voltage input end of the first substation 500. It can be understood that the third high-voltage bushing B3 and the fourth high-voltage bushing B4 are both arranged on the wall of the first box body 530. The third high-voltage bushing B3 is used for the high-voltage circuit between the first end of the first oil-immersed load switch 541 and the output end of the first substation 500 to pass through the first box body 530, and the fourth high-voltage bushing B4 is used for the high-voltage circuit between the second end of the first oil-immersed load switch 541 and the high-voltage input end of the first substation 500 to pass through the first box body 530. Since the high-voltage bushing has good electrical insulation performance, it can ensure the safe transmission of high-voltage current, thereby improving the safety and reliability of the first substation 500.

[0088] In a possible embodiment, the circuit topology of the first substation 500 is as follows: Figure 7 Taking the circuit topology of the first substation 500 as an example, when the first substation 500, the second substation 700 and the third substation 800 are connected hand in hand, the circuit topology of the power supply system 600 is as follows: Figure 7 The output end of the first substation 500 is connected to the high-voltage input end of the second substation 700, the output end of the second substation 700 is connected to the input end of the booster station 300, and the high-voltage input end of the first substation 500 is connected to the output end of the third substation 800, so that the second substation 700, the first substation 500 and the third substation 800 can be networked hand in hand. The circuit topology of the first substation 500 is as follows Figure 4-Figure 6, or, when the circuit topology of the first substation 500 shown in other figures in the embodiments of the present application is that the first substation 500, the second substation 700 and the third substation 800 are networked hand in hand, the circuit topology of the power supply system 600 can refer to Figure 7 The circuit topology of the power supply system 600 is shown and will not be described in detail in the embodiment of the present application.

[0089] The first transformer substation 500 provided in the embodiment of the present application further includes a busbar connector 560 and a second high-voltage bushing B2. The first high-voltage bushing B1 is arranged on the wall of the first box 530, and the first high-voltage bushing B1 is used for the high-voltage circuit between the input end of the high-voltage distribution circuit 540 and one end of the busbar connector 560 to pass through the first box 530. The second high-voltage bushing B2 is arranged on the wall of the second box 550, and the second high-voltage bushing B2 is used for the high-voltage circuit between the coil on the secondary side of the transformer 520 and the other end of the busbar connector 560 to pass through the second box 550. By arranging the first high-voltage bushing B1, the busbar connector 560 and the second high-voltage bushing B2, the first box 530 and the second box 550 can be two independent boxes, which is conducive to assembly and maintenance, and the heat dissipation area of ​​the first box 530 and the second box 550 can be increased, and the heat dissipation capacity of the first box 530 and the second box 550 can be improved, thereby improving the stability of the first transformer substation 500.

[0090] In a possible embodiment, the circuit topology of the first substation 500 is as follows in the following embodiments of the present application: Figure 6 Taking the circuit topology of the first substation 500 shown in FIG. 1 as an example, the structure of the first substation 500 is further introduced. Figure 6 As shown, the first substation 500 provided in the embodiment of the present application further includes an oil pillow 570 and a first pipeline 580 , and the oil pillow 570 is connected to the first box body 530 through the first pipeline 580 .

[0091] In one possible embodiment, referring to Figure 6 The oil pillow 570 may include a breathing tube 571 and an air bag 572 disposed inside the oil pillow 570, the air bag 572 being used to contain air, the air bag 572 being connected to the atmosphere through the breathing tube 571, the breathing tube 571 and the air bag 572 being used to maintain the amount of oil in the oil pillow 570 within a reasonable range.

[0092] The first substation 500 provided in the embodiment of the present application further includes an oil pillow 570 and a first pipe 580. The oil pillow 570 is connected to the first box 530 through the first pipe 580. When the volume of the first insulating oil in the first box 530 expands or shrinks with the change of oil temperature, the oil pillow 570 is used to adjust the amount of the first insulating oil in the first box 530. The oil pillow 570 is specifically used to store the first insulating oil that expands in the first box 530 or to replenish the first insulating oil in the first box 530, so as to ensure the safe and reliable operation of the first substation 500. At the same time, the first insulating oil in the oil pillow 570 has good thermal conductivity. The oil pillow 570 can also be used to transfer the heat in the first box 530 to the outside of the oil pillow 570 to achieve the cooling of the first box 530, so as to ensure the safe and reliable operation of the first substation 500.

[0093] In a possible embodiment, Figure 6 As shown, the first substation 500 further includes a second pipeline 590, and the oil pillow 570 is connected to the second box 550 through the second pipeline 590. At this time, the first insulating oil and the second insulating oil can be the same type of insulating oil.

[0094] In a possible embodiment, the first box body 530 and the second box body 550 may not share the oil pillow 570. The first substation 500 may also include an oil pillow and a pipeline corresponding to the second box body 550. The second box body 550 is connected to the corresponding oil pillow through the corresponding pipeline. The oil pillow corresponding to the second box body 550 is used to adjust the amount of the second insulating oil in the second box body 550. The oil pillow is specifically used to store the excess second insulating oil expanded in the second box body 550 or to replenish the second insulating oil into the second box body 550. At this time, the above-mentioned first insulating oil and the second insulating oil can be the same type of insulating oil or different types of insulating oil, and the embodiment of the present application is not limited to this.

[0095] In a possible embodiment, the circuit topology of the first substation 500 is as follows: Figure 6 Taking the first substation 500 shown in FIG. as an example, Figure 8 (a) in FIG. 5 is a schematic diagram of the structure of the first substation 500. Figure 8 (b) in the figure shows a top view of some components of the first substation 500. The third high-voltage bushing B3 and the fourth high-voltage bushing B4 can be arranged on the wall of the first box body 530 away from the second box body, and the operating shaft K of each switch in the high-voltage distribution circuit 540 can extend from the two opposite walls of the first box body 530 to control the corresponding switch. Figure 8 In (a), the low-voltage distribution cabinet 510 can be an outdoor waterproof cabinet, so as to avoid damage to the components in the low-voltage distribution cabinet 510. Figure 8 (a) and Figure 8 (b) in the following embodiments of the present application are exemplified by taking the first substation 500 for receiving three-phase high-voltage alternating current, or outputting three-phase high-voltage alternating current, and the first substation 500 including a corresponding three-phase alternating current circuit as an example.

[0096] In a possible embodiment, Figure 8 As shown in (c), the first substation 500 may further include a radiator 5100 disposed on both sides of the second box 550, the radiator 5100 is connected to the second box 550, and the radiator 5100 is used to cool the second insulating oil in the second box 550.

[0097] In one possible embodiment, combining Figure 4 , Figure 6 and Figure 8 In the case where the first oil-immersed load switch 541 includes an oil-immersed three-position load switch 5411, as Fig. 9 (a) and Fig. 9 (b) in FIG. 5 is a schematic diagram showing the structure of some components in the first substation 500. Fig. 9 (c) in FIG. 1 is a schematic diagram of the structure of the high-voltage distribution circuit 540 .

[0098] In one possible embodiment, combining Figure 5 , Figure 6 and Figure 8 In the case where the first oil-immersed load switch 541 includes an oil-immersed vacuum load switch 5412 and a second oil-immersed three-position disconnector 5413 connected in series, as Fig.10 (a) and Fig.10 (b) in FIG. 5 is a schematic diagram showing the structure of some components in the first substation 500. Fig.10 (c) in FIG. 1 is a schematic diagram of the structure of the high-voltage distribution circuit 540 .

[0099] In a possible embodiment, Fig.11 (a) and Fig.11 As shown in (b), it is a schematic diagram of the structure of some components in the first substation 500. The operating shaft K of each switch in the high-voltage distribution circuit 540 can extend from the first box body 530 away from the side of the second box body 550. The third high-voltage bushing B3 and the fourth high-voltage bushing B4 can be arranged on two opposite box walls of the first box body 530. By changing the position of the operating shaft K and the high-voltage bushing, the switch can be operated more conveniently, or the high-voltage bushing can be connected more conveniently through a high-voltage cable. The embodiment of the present application does not limit the specific setting position of the operating shaft K and the high-voltage bushing in the first box body 530. Figure 8 and Fig.11 For illustrative purposes only.

[0100] In a possible embodiment, the structure of some components in the first substation 500 is as follows: Fig.11 As shown, combined Figure 4 and Figure 6 In the case where the first oil-immersed load switch 541 includes an oil-immersed three-position load switch 5411, as Fig.12 (a) and Fig.12 (b) in FIG. 5 is a schematic diagram showing the structure of some components in the first substation 500. Fig.12 (c) in FIG. 1 is a schematic diagram of the structure of the high-voltage distribution circuit 540 .

[0101] In a possible embodiment, the structure of some components in the first substation 500 is as follows: Fig.11 As shown, combined Figure 5 and Figure 6 In the case where the first oil-immersed load switch 541 includes an oil-immersed vacuum load switch 5412 and a second oil-immersed three-position disconnector 5413 connected in series, as Fig.13 (a) and Fig.13 (b) in FIG. 5 is a schematic diagram showing the structure of some components in the first substation 500. Fig.13 (c) in FIG. 1 is a schematic diagram of the structure of the high-voltage distribution circuit 540 .

[0102] In the first substation 500 provided in the embodiment of the present application, the oil pillow 570 is connected to the second box 550 through the second pipe 590. When the volume of the second insulating oil in the second box 550 expands or shrinks with the change of oil temperature, the oil pillow 570 is used to adjust the amount of the second insulating oil in the second box 550. The oil pillow 570 is specifically used to store the second insulating oil that expands in the second box 550 or to replenish the second insulating oil in the second box 550, so as to ensure the safe and reliable operation of the first substation 500. At the same time, the second insulating oil in the oil pillow 570 has good thermal conductivity. The oil pillow 570 can also be used to transfer the heat in the second box 550 to the outside of the oil pillow 570 to achieve the cooling of the second box 550, so as to ensure the safe and reliable operation of the first substation 500. The first box 530 and the second box 550 share the oil pillow 570, which can reduce the cost of the first substation 500.

[0103] In a possible embodiment, Figure 6 As shown, the first substation 500 further includes a valve 5110 , which is disposed on the first pipeline 580 , and is used to open or close the communication between the first tank 530 and the second tank 550 .

[0104] Reference Figure 6Before maintaining the second box 550 or the transformer 520 in the second box 550, disconnect the frame circuit breaker 512 in the low-voltage distribution cabinet 510, close the oil-immersed vacuum circuit breaker 542, and ground the first oil-immersed three-position isolating switch 543 to ensure that the first high-voltage bushing B1 is grounded. At the same time, the connection between the first box 530 and the second box 550 is cut off by the valve 5110. At this time, the second box 550 or the transformer 520 in the second box 550 can be maintained, and the high-voltage distribution circuit 540 can continue to work. The high-voltage input end of the first substation 500 can receive the high-voltage alternating current output by the third substation 800, and the high-voltage alternating current can be transmitted to the output end of the first substation 500 through the first oil-immersed load switch 541. Figure 3 As shown in (a), the output end of the first transformer substation 500 can output the high voltage AC power to the booster station 300, or, referring to Figure 3 As shown in (b), the output end of the first substation 500 can output the high voltage AC to the booster station 300 through the second substation 700. It can be understood that by setting the valve 5110, the second box 550 or the transformer 520 in the second box 550 can be maintained separately without shutting down the first substation 500 as a whole to maintain the second box 550 or the transformer 520 in the second box 550, which can reduce the downtime of the first substation 500.

[0105] In a possible embodiment, before maintaining the first box 530 or the high-voltage distribution circuit 540 in the first box 530, the frame circuit breaker 512 in the low-voltage distribution cabinet 510 is disconnected, the oil-immersed vacuum circuit breaker 542 is closed, and the first oil-immersed three-position disconnector 543 and the first oil-immersed load switch 541 are grounded. At this time, the first box 530 or the high-voltage distribution circuit 540 in the first box 530 can be maintained. It can be understood that the first substation 500 needs to be shut down as a whole at this time.

[0106] In a possible embodiment, before maintaining the low-voltage distribution cabinet 510, the plastic case circuit breaker 511 and the frame circuit breaker 512 in the low-voltage distribution cabinet 510 are disconnected, the oil-immersed vacuum circuit breaker 542 is closed, and the first oil-immersed three-position isolating switch 543 is grounded. At this time, the low-voltage distribution cabinet 510 can be maintained.

[0107] The first substation 500 provided in the embodiment of the present application controls the valve 5110 to be closed, thereby cutting off the connection between the first box 530 and the oil pillow 570. The high-voltage distribution circuit 540 in the first box 530 can continue to work, and the first substation 500 can continue to be networked hand in hand with other substations. At the same time, the second box 550 or the transformer 520 in the second box 550 can be maintained separately without the need for the first substation 500 to be shut down as a whole in order to maintain the second box 550 or the transformer 520 in the second box 550, thereby reducing the downtime of the first substation 500.

[0108] In a possible embodiment, Fig.14 As shown, the high-voltage distribution circuit 540 also includes a second oil-immersed load switch 544, one end of the second oil-immersed load switch 544 is connected to the first end of the first oil-immersed load switch 541, and the other end of the second oil-immersed load switch 544 is connected to the output end of the first substation 500.

[0109] In a possible embodiment, before maintaining the first box 530 or the high-voltage distribution circuit 540 in the first box 530, the second oil-immersed load switch 544 can be grounded while the first oil-immersed load switch 541 is grounded, thereby ensuring that in the event of a failure of the first oil-immersed load switch 541, the high-voltage alternating current received at the high-voltage input end of the first substation 500 will not be transmitted to the output end of the first substation 500, thereby improving the reliability of the first substation 500.

[0110] In a possible embodiment, Fig.14 As shown, the second oil-immersed load switch 544 includes an oil-immersed three-position load switch 5441, or, as shown in Fig.15 As shown, the second oil-immersed load switch 544 includes an oil-immersed vacuum load switch 5442 and a second oil-immersed three-position isolating switch 5443 connected in series, which is not limited in the embodiment of the present application. Compared with the oil-immersed three-position load switch 5411, the oil-immersed vacuum load switch 5442 adopts a vacuum arc extinguishing mechanism, which will not pollute the first insulating oil, and has a strong load breaking capacity, a high breaking number and a long service life, which can improve the reliability of the first substation 500. The specific connection method of the oil-immersed vacuum load switch 5442 and the second oil-immersed three-position isolating switch 5443 can refer to the specific connection method of the oil-immersed vacuum load switch 5412 and the second oil-immersed three-position isolating switch 5413 in the first oil-immersed load switch 541, which will not be repeated in the embodiment of the present application. The embodiment of the present application does not limit the specific series connection sequence of the oil-immersed vacuum load switch 5442 and the second oil-immersed three-position isolating switch 5443.

[0111] In a possible embodiment, the structure of some components in the first substation 500 is as follows: Figure 8 As shown, combined Fig.14 In the case where the second oil-immersed load switch 544 includes an oil-immersed three-position load switch 5441, as Fig.16 (a) and Fig.16 (b) in FIG. 5 is a schematic diagram showing the structure of some components in the first substation 500. Fig.16 (c) in FIG. 1 is a schematic diagram of the structure of the high-voltage distribution circuit 540 .

[0112] In a possible embodiment, the structure of some components in the first substation 500 is as follows: Figure 8 As shown, combined Fig.15 In the case where the second oil-immersed load switch 544 includes an oil-immersed vacuum load switch 5442 and a second oil-immersed three-position disconnector 5443 connected in series, as Fig.17 (a) and Fig.17 (b) in FIG. 5 is a schematic diagram showing the structure of some components in the first substation 500. Fig.17 (c) in FIG. 1 is a schematic diagram of the structure of the high-voltage distribution circuit 540 .

[0113] In a possible embodiment, the positions of the operating shaft K and the high-voltage bushing in the first substation 500 are changed, and the structures of some components in the first substation 500 are as follows: Fig.11 As shown, combined Fig.14 In the case where the second oil-immersed load switch 544 includes an oil-immersed three-position load switch 5441, as Fig.18 (a) and Fig.18 (b) in FIG. 5 is a schematic diagram showing the structure of some components in the first substation 500. Fig.18 (c) in FIG. 1 is a schematic diagram of the structure of the high-voltage distribution circuit 540 .

[0114] In a possible embodiment, the positions of the operating shaft K and the high-voltage bushing in the first substation 500 are changed, and the structures of some components in the first substation 500 are as follows: Fig.11 As shown, combined Fig.15 In the case where the second oil-immersed load switch 544 includes an oil-immersed vacuum load switch 5442 and a second oil-immersed three-position disconnector 5443 connected in series, as Fig.19 (a) and Fig.19 (b) in FIG. 5 is a schematic diagram showing the structure of some components in the first substation 500. Fig.19 (c) in FIG. 1 is a schematic diagram of the structure of the high-voltage distribution circuit 540 .

[0115] The embodiment of the present application provides a first substation 500. By setting a second oil-immersed load switch 544, it can be ensured that in the event of a failure of the first oil-immersed load switch 541, the second oil-immersed load switch 544 can disconnect the circuit between the high-voltage input end of the first substation 500 and the output end of the first substation 500, thereby improving the reliability of the first substation 500.

[0116] Based on this, Figure 3 (a) and Figure 3 As shown in (b), the embodiment of the present application further provides a power supply system 600, which includes a converter 610 and a first substation 500, wherein the input end of the converter 610 is used to connect to the output end of the energy storage device or the photovoltaic array 200, the output end of the converter 610 is connected to the low voltage input end of the first substation 500, the output end of the first substation 500 is used to connect to the input end of the booster station 300 or the high voltage input end of the second substation 700, and the high voltage input end of the first substation 500 is used to connect to the output end of the third substation 800. The circuit topology and structure of the first substation 500 can be as described above. Figure 4-Figure 19 The circuit topology and structure of the first substation 500 shown in any of the accompanying drawings.

[0117] In a possible embodiment, when the input end of the converter 610 is used to connect to a photovoltaic array, the power supply system 600 can be called a photovoltaic power supply system. When the input end of the converter 610 is used to connect to an energy storage device, the power supply system 600 can be called an energy storage power supply system. When the power supply system 600 includes multiple converters 610, and the input ends of some converters 610 in the multiple converters 610 are used to connect to an energy storage device, and the input ends of the remaining converters 610 are used to connect to a photovoltaic array, the power supply system 600 can be called a photovoltaic storage power supply system.

[0118] The above detailed description of the first substation 500 and the analysis of beneficial effects can be correspondingly referred to the power supply system 600, and the embodiments of the present application will not be repeated here.

[0119] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A first substation, characterized in that: The first substation includes a low-voltage power distribution cabinet, a transformer and a first box, wherein the first box is provided with a first insulating oil and a high-voltage power distribution circuit immersed in the first insulating oil; The output end of the low-voltage power distribution cabinet is connected to the input end of the transformer, and the output end of the transformer is connected to the input end of the high-voltage power distribution circuit; The high-voltage distribution circuit includes a first oil-immersed load switch and an oil-immersed vacuum circuit breaker and a first oil-immersed three-position disconnector connected in series; wherein the oil-immersed vacuum circuit breaker and the first oil-immersed three-position disconnector are arranged between the input end of the high-voltage distribution circuit and the first end of the first oil-immersed load switch, the first end of the first oil-immersed load switch is connected to the output end of the first substation, the output end of the first substation is used to be connected to the input end of the booster station or the high-voltage input end of the second substation, the second end of the first oil-immersed load switch is connected to the high-voltage input end of the first substation, and the high-voltage input end of the first substation is used to be connected to the output end of the third substation.

2. The first substation according to claim 1, characterized in that: The first substation further comprises a second box, a first high-voltage bushing and a low-voltage bushing, the second box is provided with a second insulating oil, and the transformer is immersed in the second insulating oil; The first box body is connected to the second box body through the first high-voltage bushing, and the second box body is connected to the low-voltage distribution cabinet through the low-voltage bushing.

3. The first substation according to claim 2, characterized in that: The first substation also includes a busbar connector and a second high-voltage bushing; The first box is connected to one end of the busbar connector through the first high-voltage bushing, and the second box is connected to the other end of the busbar connector through the second high-voltage bushing.

4. The first substation according to any one of claims 1 to 3, characterized in that: The first substation further includes a third high-voltage bushing and a fourth high-voltage bushing; A first end of the first oil-immersed load switch is connected to one end of the third high-voltage bushing, the other end of the third high-voltage bushing is connected to the output end of the first substation, a second end of the first oil-immersed load switch is connected to one end of the fourth high-voltage bushing, the other end of the fourth high-voltage bushing is connected to the high-voltage input end of the first substation.

5. The first substation according to any one of claims 1 to 4, characterized in that: The first substation further includes an oil pillow and a first pipeline, and the oil pillow is connected to the first box through the first pipeline.

6. The first substation according to claim 5, characterized in that: The first substation further includes a second pipeline, and the oil pillow is connected to the second tank through the second pipeline.

7. The first substation according to claim 6, characterized in that: The first substation further includes a valve, and the valve is disposed on the first pipeline.

8. The first substation according to any one of claims 1 to 7, characterized in that: The high-voltage power distribution circuit also includes a second oil-immersed load switch, one end of the second oil-immersed load switch is connected to the first end of the first oil-immersed load switch, and the other end of the second oil-immersed load switch is connected to the output end of the first substation.

9. The first substation according to any one of claims 1 to 8, characterized in that: The oil-immersed load switch comprises: an oil-immersed three-position load switch, or an oil-immersed vacuum load switch and a second oil-immersed three-position isolating switch connected in series.

10. A power supply system, characterized in that: It includes a converter and a first substation, the input end of the converter is used to connect to an energy storage device or a photovoltaic array, the output end of the converter is connected to a low-voltage input end of the first substation, the output end of the first substation is used to connect to an input end of a booster station or a high-voltage input end of a second substation, the high-voltage input end of the first substation is used to connect to an output end of a third substation, and the first substation is the first substation as described in any one of claims 1 to 9.

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