A prefabricated substation

Abstract

This application discloses a prefabricated substation, which includes a transformer, a high-voltage compartment, a medium-voltage compartment, and a low-voltage compartment. The high-voltage compartment is arranged at the first end in the length direction of the transformer, and the medium-voltage compartment and the low-voltage compartment are arranged at the second end in the length direction of the transformer. The medium-voltage compartment and the low-voltage compartment are arranged side by side along the width direction of the transformer. The overall structure of the prefabricated substation is arranged in a "grid" shape. By changing the arrangement mode of the high-voltage compartment, the medium-voltage compartment, and the low-voltage compartment of the prefabricated substation, the volume of the prefabricated substation along the length and width directions of the transformer is reduced; at the same time, the low-voltage bushing of the transformer is connected to the busbar or the second circuit breaker in the low-voltage compartment through a transition flange, and the transition flange extends into the low-voltage compartment. Through the structural design of the transition flange, the requirements of electrical clearance and creepage distance can be accurately met, the risk of short circuit between phases or to the ground can be reduced, and thus the size of the prefabricated substation along the width direction of the transformer is reduced.

Description

Technical Field

[0001] This application relates to the field of power equipment technology, and in particular to a prefabricated substation. Background Technology

[0002] Under the global trend of low-carbon economy and energy revolution, and with the grand goal of "carbon neutrality and carbon peaking", the new energy industry is gradually changing from auxiliary energy to main energy.

[0003] With the vigorous development of the new energy industry, the quality and environmental adaptability of prefabricated substations have gradually improved, their product competitiveness has increased dramatically, and cost control has become particularly important.

[0004] Prefabricated substations, also known as box-type substations, generally consist of a high-voltage compartment, a transformer, a medium-voltage compartment, and a low-voltage compartment. In related technologies, prefabricated substations occupy significant space in both the length and width directions of the transformer, making them unsuitable for miniaturized production designs. Utility Model Content

[0005] This application proposes a prefabricated substation to meet the requirements of miniaturized production design.

[0006] To achieve the above objectives, this application provides a prefabricated substation, including a transformer, a high-voltage compartment, a medium-voltage compartment, and a low-voltage compartment.

[0007] The high-voltage chamber is located at the first end along the length of the transformer, and the medium-voltage chamber and the low-voltage chamber are located at the second end along the length of the transformer. The medium-voltage chamber and the low-voltage chamber are arranged side by side along the width of the transformer.

[0008] The low-voltage bushing of the transformer is led to the outside of the transformer's oil tank through a transition flange, and the transition flange is located in the low-voltage chamber. The low-voltage chamber outputs wires from the side of the low-voltage chamber away from the transformer and the medium-voltage chamber, or from the bottom surface of the low-voltage chamber.

[0009] Optionally, in the above-mentioned prefabricated substation, the transition flange is located above the low-voltage chamber, and the control transformer of the low-voltage chamber is installed below the transition flange.

[0010] Optionally, the prefabricated substation also includes a UPS power supply, installed in the low-voltage room, for supplying power to the secondary circuits of the prefabricated substation during power outages or maintenance.

[0011] Optionally, in the above-mentioned prefabricated substation, the medium-voltage room and the low-voltage room share a common compartment, and a partition is provided in the compartment. The partition is arranged vertically and parallel to the length of the transformer, so as to form the medium-voltage room and the low-voltage room on both sides of the partition.

[0012] Optionally, in the aforementioned prefabricated substation, the medium-voltage switchgear in the medium-voltage room is an air-insulated switchgear.

[0013] Optionally, in the above-mentioned prefabricated substation, the high-voltage bushings and medium-voltage bushings of the transformer are arranged side by side along the width direction of the transformer;

[0014] A first oil flow hole and a high-voltage oil box are provided on the second side wall adjacent to the first side wall where the high-voltage bushing is installed in the transformer's oil tank, and the first oil flow hole and the high-voltage oil box correspond to the positions of the high-voltage bushing.

[0015] And / or, a second oil flow hole and a medium-pressure oil box are provided on the fourth side wall adjacent to the third side wall of the medium-pressure bushing installed in the oil tank of the transformer, and the second oil flow hole and the medium-pressure oil box correspond to the position of the A-phase medium-pressure bushing of the medium-pressure bushing, and the medium-pressure chamber is located in front of the low-pressure chamber;

[0016] The first sidewall and the third sidewall are located on both sides of the transformer in the width direction, and the second sidewall and the fourth sidewall are located on both sides of the transformer in the length direction.

[0017] Optionally, in the above-mentioned prefabricated substation, if the high-voltage oil box is present, the high-voltage oil box is welded to the oil tank of the transformer;

[0018] In the presence of the medium-voltage oil box, the medium-voltage oil box is welded to the oil tank of the transformer.

[0019] Optionally, in the aforementioned prefabricated substation, both the medium-voltage bushing and the high-voltage bushing of the transformer are horizontally connected.

[0020] Optionally, in the aforementioned prefabricated substation, the first circuit breaker in the high-voltage room is an integrated vacuum circuit breaker.

[0021] Optionally, in the aforementioned prefabricated substation, the transformer is a three-winding transformer.

[0022] The prefabricated substation provided by the embodiment of the present application includes a transformer, a high-voltage chamber, a medium-voltage chamber, and a low-voltage chamber. The high-voltage chamber is arranged at the first end in the length direction of the transformer, and the medium-voltage chamber and the low-voltage chamber are arranged at the second end in the length direction of the transformer. The medium-voltage chamber and the low-voltage chamber are arranged side by side along the width direction of the transformer. The overall layout of the prefabricated substation is in a "mu" shape. By changing the arrangement of the high-voltage chamber, the medium-voltage chamber, and the low-voltage chamber of the prefabricated substation, the dimensions of the prefabricated substation along the length and width directions of the transformer are reduced, and thus the volume of the prefabricated substation along the length and width directions of the transformer is also reduced. At the same time, the low-voltage bushing of the transformer is connected to the busbar or the second circuit breaker of the low-voltage chamber through a transition flange, and the transition flange extends into the low-voltage chamber. Through the structural design of the transition flange, the requirements of electrical clearance and creepage distance can be accurately met, the risk of short circuit between phases or to ground is reduced, and thus the dimension of the prefabricated substation along the width direction of the transformer is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the provided drawings, and the present application can also be applied to other similar scenarios according to the provided drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.

[0024] Figure 1 is the top view of the prefabricated substation provided by the embodiment of the present application;

[0025] Figure 2 is the structural schematic diagram of the transformer of the prefabricated substation provided by the embodiment of the present application;

[0026] Figure 3 is the structural schematic diagram of the connection between the transformer and the transition flange of the prefabricated substation provided by the embodiment of the present application.

[0027] Where:

[0028] 1 - Transformer; 2 - High-voltage chamber; 3 - Medium-voltage chamber; 4 - Low-voltage chamber; 5 - Transition flange; 6 - Control transformer; 7 - UPS power supply; 8 - Medium-voltage switchgear; 9 - High-voltage bushing; 10 - Medium-voltage bushing; 11 - High-voltage oil box; 12 - Medium-voltage oil box; 13 - First circuit breaker; 14 - Second circuit breaker. SPECIFIC EMBODIMENTS

[0029] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. The described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0030] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0031] It should be understood that the terms "system," "apparatus," "unit," and / or "module" used in this application are a method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0032] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0033] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0034] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0035] The prefabricated substation includes a high-voltage chamber, a transformer, a medium-voltage chamber, and a low-voltage chamber. In the related art, there are two arrangement methods for the high-voltage chamber, transformer, medium-voltage chamber, and low-voltage chamber of the prefabricated substation. One is that the medium-voltage chamber and the low-voltage chamber respectively occupy one side of the transformer, that is, the high-voltage chamber, the medium-voltage chamber, and the low-voltage chamber are respectively distributed on three sides of the circumference of the transformer. The other is that the medium-voltage chamber and the low-voltage chamber are located together on one side of the transformer, that is, the high-voltage chamber is located on the first side of the circumference of the transformer, and the medium-voltage chamber and the low-voltage chamber are located on the second side of the circumference of the transformer. The first side and the second side are different sides. In this embodiment, the medium-voltage bushing and the low-voltage bushing of the transformer are also located on the second side. In order to ensure the insulation distance between the medium-voltage bushing and the low-voltage bushing, it is necessary to move the medium-voltage bushing outward from the transformer. It should be noted here that moving outward means moving along the width direction of the transformer away from the low-voltage chamber.

[0036] Both of the above two methods will cause the prefabricated substation to occupy a large space in both the width and length directions, which cannot meet the requirements of the miniaturized production design of the prefabricated substation product, nor can it reduce the production and transportation costs of the prefabricated substation.

[0037] As Figure 1 shown, the prefabricated substation disclosed in this application includes a transformer 1, a high-voltage chamber 2, a medium-voltage chamber 3, and a low-voltage chamber 4. The high-voltage chamber 2 is arranged at the first end of the transformer 1 in the length direction, and the medium-voltage chamber 3 and the low-voltage chamber 4 are arranged at the second end of the transformer 1 in the length direction. The medium-voltage chamber 3 and the low-voltage chamber 4 are arranged side by side along the width direction of the transformer 1. The prefabricated substation is arranged in an overall "eye" shape structure.

[0038] The prefabricated substation disclosed in this application respectively arranges the high-voltage chamber 2, the medium-voltage chamber 3, and the low-voltage chamber 4 on both sides of the transformer 1 in the length direction, and makes full use of the space on the side of the transformer 1 parallel to its own width direction as much as possible. Compared with the method in the related art where the high-voltage chamber 2, the medium-voltage chamber 3, and the low-voltage chamber 4 are respectively arranged on three sides of the circumference of the transformer 1, the size of the prefabricated substation along the width direction of the transformer 1 is reduced.

[0039] The low-voltage chamber 4 and the medium-voltage chamber 3 are arranged side by side along the width direction of the transformer 1, which can also reduce the size of the prefabricated substation along the length direction of the transformer 1 to a certain extent.

[0040] By changing the arrangement method of the high-voltage chamber 2, the medium-voltage chamber 3, and the low-voltage chamber 4 of the prefabricated substation in this application, the size of the prefabricated substation along the length and width directions of the transformer 1 is reduced, and thus the volume of the prefabricated substation along the length and width directions of the transformer 1 is also reduced.

[0041] As Figure 2 and Figure 3As shown, in this scheme, the low-voltage bushing of transformer 1 is connected to the busbar of low-voltage chamber 4 or the second circuit breaker 14 via transition flange 5, as follows: Figure 1 As shown, the transition flange 5 extends into the low-pressure chamber 4.

[0042] The transition flange 5 primarily serves to mechanically fix the electrical connection, provide insulation isolation, and protect the environment. Specifically, it acts as a connection intermediary between the low-voltage bushing of transformer 1 and the busbar of low-voltage chamber 4 or the second circuit breaker 14, transmitting electrical energy, fixing the low-voltage bushing of transformer 1, dispersing the electromagnetic force and external mechanical stress of the busbar, and preventing damage to the low-voltage bushing due to stress. It also isolates the oil-immersed insulation system inside transformer 1 from the air insulation system of low-voltage chamber 4, preventing oil vapor from entering low-voltage chamber 4 and causing insulation hazards (such as condensation leading to creepage). Through the structural design of the transition flange 5, the electrical clearance and creepage distance requirements can be precisely met, reducing the risk of phase-to-phase or phase-to-ground short circuits. Furthermore, it eliminates the need to move the medium-voltage bushing 10 further outward from transformer 1 to meet the insulation distance requirements between the medium-voltage bushing 10 and the low-voltage bushing of transformer 1, thereby reducing the dimensions of the prefabricated substation along the width direction of transformer 1. Simultaneously, it prevents external dust and moisture from entering the oil tank.

[0043] In this embodiment, the low-voltage chamber 4 exits from the side away from the transformer 1 and the medium-voltage chamber 3, or the low-voltage chamber 4 exits from the bottom surface of the low-voltage chamber 4. By changing the position of the exit side of the low-voltage chamber 4, the low-voltage winding exit is moved away from the medium-voltage winding and the medium-voltage winding exit, thereby increasing the insulation distance in terms of spatial layout. This replaces the method of increasing the size of the low-voltage chamber 4 and the high-voltage chamber 2 to ensure the insulation distance, and to a certain extent reduces the size of the prefabricated substation along the length and width of the transformer 1.

[0044] Optionally, the transition flange 5 is provided with a mounting handhole.

[0045] The low-voltage compartment 4 includes a second circuit breaker 14, a control transformer 6, low-voltage flexible connector a, low-voltage flexible connector b, and low-voltage flexible connector c.

[0046] The second circuit breaker 14 is connected to the A-phase, B-phase, and C-phase low-voltage bushings of transformer 1 via low-voltage flexible connectors a, b, and c, respectively.

[0047] The second circuit breaker 14 may be an intelligent universal circuit breaker. The second circuit breaker 14 is connected to the low-voltage bushing of the transformer 1 through a copper busbar. The second circuit breaker 14 is directly connected to the incoming cable through the bottom opening of the busbar.

[0048] Control transformer 6 provides a safe and stable low-voltage power supply to the secondary circuit of pre-installed transformer 1 (the secondary circuit refers to the low-voltage circuit used for control, protection, measurement, signal transmission and monitoring, which does not directly participate in the transmission and distribution of electrical energy, but monitors and controls the primary circuit (high-voltage and low-voltage main circuit) through electrical components). A second circuit breaker 14 needs to be connected in series on the primary side (input terminal) of control transformer 6 for short-circuit protection, and the secondary side (output terminal) of control transformer 6 supplies power to the secondary circuit.

[0049] In this scheme, the low-voltage sleeve of transformer 1 is led out of the oil tank of transformer 1 through transition flange 5. Transition flange 5 is located above low-voltage chamber 4, and an empty space is formed below transition flange 5 in low-voltage chamber 4. Control transformer 6 utilizes this empty space and occupies the space in the vertical direction of low-voltage chamber 4, realizing full utilization of the space in low-voltage chamber 4. Compared with the method in related technologies that requires a separate space for control transformer 6, the volume of prefabricated substation along the length and width of transformer 1 is further reduced.

[0050] The prefabricated substation disclosed in this application also includes a UPS power supply 7 (Uninterruptible Power Supply), installed in the low-voltage room 4, which is used to provide a stable and uninterrupted power supply to the secondary circuit when the prefabricated substation is shut down or under maintenance, ensuring that the prefabricated substation can still be monitored, protected and operated normally when the mains power is abnormal or interrupted.

[0051] When the mains power on the high-voltage or low-voltage side of the prefabricated substation is interrupted, the UPS power supply 7 immediately switches to battery power mode to ensure the continuous operation of secondary equipment and avoid failure to detect faults in a timely manner due to monitoring interruption.

[0052] The low-voltage compartment 4 includes a second circuit breaker 14, a UPS power supply 7, and a control transformer 6, etc. The second circuit breaker 14 is connected in series with the low-voltage coil of the transformer 1 through a low-voltage bushing and a low-voltage terminal.

[0053] The medium-voltage compartment 3 includes a medium-voltage switchgear 8, which is connected in series with the medium-voltage coil of the transformer 1 through a medium-voltage bushing 10 and a medium-voltage terminal block.

[0054] In related technologies, the medium-voltage switchgear 8 of the medium-voltage room 3 adopts a PT cabinet (voltage transformer cabinet) + circuit breaker, which is large in size. This application adopts a smaller air-insulated switchgear, which effectively shortens the size of the medium-voltage room 3 along the length of the transformer 1, further reduces the size of the prefabricated substation along the length of the transformer 1, and reduces the volume of the prefabricated substation along the length of the transformer 1.

[0055] The air-insulated switchgear is connected to the medium-voltage bushing 10 of transformer 1 via a medium-voltage flexible connection. The medium-voltage flexible connection includes medium-voltage flexible connection a, medium-voltage flexible connection b, and medium-voltage flexible connection c, which are respectively connected to the A-phase, B-phase, and C-phase medium-voltage bushings of the medium-voltage bushing 10 of transformer 1.

[0056] like Figure 1 As shown, the second circuit breaker 14 and the UPS power supply 7 are arranged side by side along the length of the transformer 1, and the positions of the second circuit breaker 14 and the UPS power supply 7 correspond to those of the air-insulated switch cabinet.

[0057] like Figure 1 As shown, the high-voltage bushing 9 and the medium-voltage bushing 10 of transformer 1 are both arranged along the width direction of transformer 1. Optionally, the high-voltage bushing 9 and the medium-voltage bushing 10 are both arranged in the horizontal direction to make full use of the space of the prefabricated substation along the width direction of transformer 1, so as to reduce the occupation of the space along the width direction perpendicular to transformer 1.

[0058] Horizontal cabling effectively utilizes the space around the equipment, avoiding the need for a large amount of space above the equipment for wiring connections, making the equipment layout more compact and reducing the footprint.

[0059] In some embodiments, the medium-pressure chamber 3 is located in front of the low-pressure chamber 4.

[0060] In some embodiments, the second sidewall adjacent to the first sidewall of the transformer 1's oil tank where the high-voltage bushing 9 is installed is provided with a first oil flow hole and a high-voltage oil box 11, and the first oil flow hole and the high-voltage oil box 11 correspond to the position of the high-voltage bushing 9.

[0061] In other embodiments, a second oil flow hole and a medium-pressure oil box 12 are provided on the fourth side wall adjacent to the third side wall of the medium-pressure bushing 10 installed in the oil tank of transformer 1, and the second oil flow hole and the medium-pressure oil box 12 correspond to the position of the A-phase medium-pressure bushing 10 of the medium-pressure bushing 10.

[0062] In other embodiments, the second sidewall adjacent to the first sidewall of the transformer 1 tank-mounted high-voltage bushing 9 is provided with a first oil flow hole and a high-voltage oil box 11, and the fourth sidewall adjacent to the third sidewall of the transformer 1 tank-mounted medium-voltage bushing 10 is provided with a second oil flow hole and a medium-voltage oil box 12. The first oil flow hole and the high-voltage oil box 11 correspond to the position of the high-voltage bushing 9, and the second oil flow hole and the medium-voltage oil box 12 correspond to the position of the A-phase medium-voltage bushing 10 of the medium-voltage bushing 10.

[0063] The above embodiments can further reduce the dimensions of the prefabricated substation along the width direction of transformer 1.

[0064] The first sidewall, the second sidewall, the third sidewall, and the fourth sidewall are the four circumferential sidewalls of the oil tank of transformer 1. The first sidewall and the third sidewall are located on both sides of the width direction of transformer 1, and the second sidewall and the fourth sidewall are located on both sides of the length direction of transformer 1.

[0065] like Figure 2 As shown, the high-voltage oil box 11 and the medium-voltage oil box 12 are located on the two side walls of the transformer 1 along its width direction, without occupying the space of the transformer 1 along its length direction, and without affecting the setting of the high-voltage chamber 2, the medium-voltage chamber 3 and the low-voltage chamber 4.

[0066] Optionally, the high-voltage oil box 11 and the medium-voltage oil box 12 are welded to the oil tank of the transformer 1.

[0067] In some embodiments, the intermediate-pressure chamber 3 and the low-pressure chamber 4 share a common compartment, which is equipped with a partition, such as... Figure 1 As shown, the partition is arranged vertically and parallel to the length of the transformer 1 to form a medium-voltage chamber 3 and a low-voltage chamber 4 on both sides of the partition.

[0068] The shared compartment between medium-voltage compartment 3 and low-voltage compartment 4, compared to the separate compartments for medium-voltage compartment 3 and low-voltage compartment 4, can reduce the dimensions of medium-voltage compartment 3 and low-voltage compartment 4 along the width direction of transformer 1 to a certain extent, thereby reducing the volume of the prefabricated substation.

[0069] In some embodiments, the circuit breaker 13 of the high-voltage chamber 2 is an integrated vacuum circuit breaker, which includes a high-voltage current transformer, a high-voltage surge arrester, the vacuum circuit breaker 13, a disconnecting switch, and a grounding switch.

[0070] The integrated vacuum circuit breaker is connected to a high-voltage sensor for use in field high-voltage cable connection, ensuring the necessary high-voltage cable connections. The integrated vacuum circuit breaker is connected to the high-voltage bushing 9 of transformer 1 via a copper busbar.

[0071] The integrated vacuum circuit breaker has the advantage of small size, which can further reduce the size of the high-voltage chamber 2 along the length of the transformer 1, thereby reducing the volume of the prefabricated substation along the length of the transformer 1.

[0072] Transformer 1 in the prefabricated substation is a three-winding transformer.

[0073] A three-winding transformer is a transformer with three windings (high voltage winding, medium voltage winding, and low voltage winding) that can transmit electrical energy between three power grids of different voltage levels.

[0074] The three-winding transformer includes a circular silicon steel core, a low-voltage coil, a medium-voltage coil, and a high-voltage coil. The low-voltage coil, medium-voltage coil, and high-voltage coil are sequentially mounted on the circular silicon steel core and fixed as a whole by an auxiliary structure. They are then fixed inside the transformer 1 by a positioning and press-fitting structure.

[0075] Traditional prefabricated substations require multiple cascaded dual-winding transformers (e.g., high voltage → medium voltage, medium voltage → low voltage) to achieve power conversion. In contrast, a three-winding transformer can directly connect to the high-voltage, medium-voltage, and low-voltage power grids through a single device, reducing intermediate power conversion links, minimizing the space occupied by the transformer, and reducing the size of the prefabricated substation. This, in turn, reduces the space occupied by the prefabricated substation, lowers manufacturing and land acquisition costs, and is particularly suitable for urban power grids or compact substations where land resources are scarce.

[0076] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. The scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A prepackaged electrical substation, characterized in that, It includes a transformer (1), a high-voltage compartment (2), a medium-voltage compartment (3), and a low-voltage compartment (4). The high-voltage chamber (2) is provided at the first end of the transformer (1) along its length, and the medium-voltage chamber (3) and the low-voltage chamber (4) are provided at the second end of the transformer (1) along its length. The medium-voltage chamber (3) and the low-voltage chamber (4) are arranged side by side along the width direction of the transformer (1). The low-voltage bushing of the transformer (1) is led to the outside of the oil tank of the transformer (1) through the transition flange (5) and the transition flange (5) is located in the low-voltage chamber (4). The low-voltage chamber (4) is connected to the side away from the transformer (1) and the medium-voltage chamber (3) or the low-voltage chamber (4) is connected to the bottom surface of the low-voltage chamber (4).

2. The prepackaged electrical substation of claim 1, wherein, The transition flange (5) is located above the low-pressure chamber (4), and the control transformer (6) of the low-pressure chamber (4) is installed below the transition flange (5).

3. The prepackaged electrical transformer station of claim 1, wherein, It also includes a UPS power supply (7), installed in the low-voltage room (4), for supplying power to the secondary circuits of the prefabricated substation during power outages or maintenance.

4. The prepackaged electrical transformer station of claim 1, wherein, The medium-pressure chamber (3) and the low-pressure chamber (4) share a common compartment. A partition is provided in the compartment. The partition is arranged in a vertical direction and along the length direction parallel to the transformer (1) to form the medium-pressure chamber (3) and the low-pressure chamber (4) on both sides of the partition.

5. The prepackaged electrical transformer station according to any of claims 1-4, characterized in that, The medium-voltage switchgear (8) of the medium-voltage chamber (3) is an air-insulated switchgear.

6. The prepackaged electrical transformer station according to any of claims 1-4, characterized in that, The high-voltage bushing (9) and medium-voltage bushing (10) of the transformer (1) are arranged side by side along the width direction of the transformer (1); A first oil flow hole and a high-voltage oil box (11) are provided on the second side wall adjacent to the first side wall of the oil tank of the transformer (1) where the high-voltage bushing (9) is installed. The first oil flow hole and the high-voltage oil box (11) correspond to the positions of the high-voltage bushing (9). And / or, a second oil flow hole and a medium-pressure oil box (12) are provided on the fourth side wall adjacent to the third side wall of the medium-pressure bushing (10) installed in the oil tank of the transformer (1), the second oil flow hole and the medium-pressure oil box (12) and the position of the A-phase medium-pressure bushing of the medium-pressure bushing (10) are provided, the medium-pressure chamber (3) is located in front of the low-pressure chamber (4); The first sidewall and the third sidewall are located on both sides of the transformer (1) in the width direction, and the second sidewall and the fourth sidewall are located on both sides of the transformer (1) in the length direction.

7. The prepackaged electrical substation of claim 6, wherein, In the presence of the high-voltage oil box (11), the high-voltage oil box (11) is welded to the oil tank of the transformer (1); In the presence of the medium-voltage oil box (12), the medium-voltage oil box (12) is welded to the oil tank of the transformer (1).

8. The prepackaged electrical substation of claim 6, wherein, The medium-voltage bushing (10) and high-voltage bushing (9) of the transformer (1) are both horizontally connected.

9. The prepackaged electrical transformer station according to any of claims 1-4, characterized in that, The first circuit breaker (13) of the high-voltage chamber (2) is an integrated vacuum circuit breaker.

10. The prefabricated substation according to any one of claims 1-4, characterized in that, The transformer (1) is a three-winding transformer.

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