Underground GIS arrangement structure of pumped storage power station

Abstract

This invention relates to the field of pumped storage power station technology, specifically to an underground GIS layout structure for a pumped storage power station. The layout structure is located inside the main transformer tunnel. The main transformer tunnel is divided into, from bottom to top, a main transformer layer, a pipeline busbar layer, and a switchyard layer. The main transformer layer houses the main transformer. The pipeline busbar layer contains an independent reactor room and a partition wall. The independent reactor room contains branch circuit current-limiting reactors. These reactors are arranged in a phase-separated planar layout on the ground inside the independent reactor room. The partition wall physically separates the high-voltage GIS unit equipment from the starting busbar and the independent reactor room. The starting busbar is arranged vertically inside the pipeline busbar layer. The switchyard layer contains GIS switchgear. This invention reduces the footprint through spatial allocation, optimizes the utilization of underground space, and improves equipment safety and maintenance convenience.

Description

Technical Field

[0001] This invention relates to the field of pumped storage power station technology, specifically to an underground GIS layout structure for a pumped storage power station. Background Technology

[0002] With the widespread application of new energy sources and smart grids in pumped storage, hydropower, and other fields, ensuring the safe transmission of electricity through these large-scale hydropower projects in complex mountainous geological environments is a prerequisite for their successful implementation.

[0003] Among numerous power distribution layout schemes, gas-insulated metal-enclosed switchgear (GIS) has become one of the mainstream substation technologies due to its ability to significantly reduce the substation's footprint and its high operational reliability. The advantages of using surface-mounted GIS include smaller underground cavern excavation scale. If the geological conditions of the area where the underground powerhouse is located are poor, it can reduce construction difficulty and save on some underground cavern excavation and support work. Furthermore, if the surface switch station is located in a suitable location, transportation and installation are also more convenient. However, the problem is that ground switch stations require a large area. Pumped storage power stations are mostly located in rugged and steep mountains. It is difficult to select a ground switch station location that is flat, large enough, meets the outgoing line requirements, and is easy to operate and maintain. Usually, a series of problems are faced, such as high slope excavation, land acquisition, deforestation, ecological maintenance, road construction, and long outgoing line systems. Especially for power stations with a large number of incoming line circuits (3 or more), not only is the ground area large, but the outgoing line system (horizontal tunnels, vertical shafts, inclined shafts, etc.) also needs to be comprehensively considered in terms of layout, fire prevention, operation and maintenance, etc., which is more complicated. In addition, if there is no suitable location for the ground switch station near the lower reservoir or the owner's camp, the personnel operation and maintenance and duty arrangements are also inconvenient.

[0004] By adopting underground GIS technology, half of the land area occupied by the surface outgoing line site can be saved, allowing for more and better choices in the location of the surface outgoing line site. This reduces the scope of land acquisition, ecological damage, slope excavation, and the length of the outgoing line system. Furthermore, the use of underground GIS allows for a more centralized layout of the main equipment of the power station, making operation and maintenance more convenient. Currently, there are few pumped storage power stations in operation in China that use underground GIS. In existing conventional underground GIS technical solutions, the main transformer room has a high floor height, which requires a long hanger for the fire water pipes above the main transformer and the air ducts to be installed at a high position, resulting in lower safety. The pipeline busbar floor is used to arrange pipeline busbars and starting circuit busbars of unit or joint units, and the floor height is low, which requires the busbars to adopt a three-phase horizontal arrangement scheme, occupying a lot of plane space and affecting the inspection passage of operation and maintenance personnel to a certain extent. The overall equipment layout space is tight. In addition, the starting circuit equipment (busbars, disconnect switches, etc.) of different voltage levels and the pipeline busbars on the high voltage side of the main transformer are not separated, which brings some inconvenience to the operation and management of the power station. The current limiting reactors of the branch circuits are arranged vertically in the busbar tunnel. This arrangement increases the length and height of the busbar tunnel. In addition, due to the limited space in the busbar tunnel, it is not possible to isolate and arrange the reactors separately. In the event of an accident, it will directly affect the nearby busbars, generator voltage circuit equipment, etc.

[0005] Relevant patent documents retrieved:

[0006] The document, published in China (CN105089024B) on September 12, 2017, discloses a method and structure for arranging outgoing lines in an underground powerhouse. The technical solution involves connecting the underground main transformer tunnel to the surface switch station (surface GIS) via an outgoing line shaft. This is achieved by placing the outgoing line shaft within the control building of the surface switch station, and simultaneously excavating the rock mass between the main transformer tunnel and the shaft to form a triangular prism excavation body for connection. This optimizes the outgoing line connection structure to accommodate the insertion of high-voltage cables.

[0007] The document, published in China (CN104712091B) on November 2, 2016, discloses a ceiling structure and construction method for a large-span underground powerhouse. The technical solution involves using a multi-suspension structure to arrange ventilation ducts, lighting fixtures, air conditioning water pipes, and other equipment within the space between the powerhouse ceiling and the sprayed anchor layer of the arch rock wall in the layout of the underground main powerhouse and main transformer tunnel. This addresses the load-bearing issues of the arch support and the suspension of large-span equipment.

[0008] The prior art represented by the aforementioned documents has at least the following unresolved technical problems or defects: Regarding the aforementioned patent document CN105089024B, although the technical solution of this application achieves the adjustment of the outgoing line structure of the plant, the technical problem it aims to solve is how to optimize the outgoing line connection from the main transformer tunnel to the ground, with the goal of good connection rather than minimizing land occupation. This technical solution still uses a ground-based switch station that occupies a huge area. It does not provide guidance on how to sink large-scale GIS equipment underground to avoid high slope excavation, large-scale land acquisition, and ecological damage, and it also lacks the ability to fundamentally solve the problem of inconvenient operation and maintenance of remote ground-based outgoing line sites.

[0009] Regarding the aforementioned patent document CN104712091B, although the technical solution utilizes a suspended ceiling structure to solve the ventilation and pipeline suspension problems within the main transformer tunnel, its logic is a passive adaptation to the suspension difficulties brought about by the high space. The purpose of its large-span suspended ceiling is to arrange equipment above the main transformer tunnel. However, in the deeper tasks requiring improved physical isolation safety levels for electrical equipment and optimized upper busbar layout, it fails to optimize the phase-plane layout of current-limiting reactors according to disaster prevention needs, and also fails to provide guidance on establishing isolation walls between high- and low-voltage equipment.

[0010] There is still an urgent need in this field for a technical solution that can overcome the aforementioned limitations. This solution should be able to synergistically optimize the vertical height distribution of the main transformer cavern (lowering the main transformer layer and raising the pipeline busbar layer), thereby improving the safety, structural rationality, and ease of operation and maintenance of the underground GIS layout. Summary of the Invention

[0011] In order to solve at least one of the above-mentioned technical problems existing in the prior art, the present invention provides an underground GIS layout structure for a pumped storage power station.

[0012] To achieve the above objectives, the technical solution of the present invention is as follows: This invention provides an underground GIS layout structure for a pumped storage power station. The underground GIS layout structure is set up inside the main transformer tunnel formed by underground excavation. The main transformer tunnel is divided into a main transformer layer, a pipeline busbar layer and a switchyard layer from bottom to top in the vertical direction. The main transformer is installed on the ground inside the main transformer layer; The pipeline busbar layer is located directly above the main transformer layer. The pipeline busbar layer contains a starting busbar, a branch circuit current-limiting reactor, a high-voltage GIS unit device, and a partition wall. The starting busbar is vertically fixed inside the pipeline busbar layer. An independent reactor room is also provided inside the pipeline bus layer. The branch circuit current-limiting reactor is installed on the ground inside the independent reactor room, and the branch circuit current-limiting reactor is placed in a phase-separated planar arrangement in the independent reactor room. The partition wall is vertically installed between the bottom plate and the top plate inside the pipeline busbar layer. The high-voltage GIS unit equipment is spatially isolated from the starting busbar and the independent reactor room through the partition wall. The high-voltage side incoming line of the main transformer passes upward through the pipeline busbar layer and is electrically connected to the high-voltage GIS unit equipment. The high-voltage GIS unit equipment is then electrically connected upward to the GIS switchgear inside the switch station layer.

[0013] Furthermore, the height of the pipeline busbar layer is configured to accommodate a vertical space in which the starting busbar is arranged vertically.

[0014] Furthermore, the height of the main transformer floor is configured to be a preset net height that can safely accommodate the main transformer and the top auxiliary facilities.

[0015] Furthermore, a suspension rod is fixedly installed on the bottom surface of the top plate above the main transformer layer, and the fire protection pipeline and ventilation pipeline are suspended and fixed above the main transformer through the suspension rod.

[0016] Furthermore, the partition wall divides the pipeline busbar layer into two isolated areas, one of which is a medium-voltage area for arranging the starting busbar, the independent reactor room, the disconnect switch, and the operating mechanism; The other side is a high-voltage area, used to house the high-voltage GIS unit equipment.

[0017] Furthermore, the walls of the independent reactor room are solid isolation walls, and the branch circuit current-limiting reactors are SFC output reactors. The SFC output reactors are arranged in a straight line on the floor inside the independent reactor room in a phase-separated plane.

[0018] Furthermore, multiple main transformers are arranged sequentially at intervals along the horizontal direction inside the main transformer layer.

[0019] Furthermore, each of the two adjacent main transformers is connected to a vertically upward connecting bushing. The high-voltage side incoming line of the main transformer passes through the connecting bushing upward through the floor slab and is electrically connected to a group of high-voltage GIS unit equipment in the pipeline busbar layer. The high-voltage GIS unit equipment then passes upward through the floor slab and is electrically connected to the GIS switchgear inside the switch station layer.

[0020] Furthermore, a main transformer transport channel is arranged parallel to one side of the main transformer inside the main transformer layer, and an oil collection pool is recessed in the bottom plate directly below the main transformer.

[0021] Furthermore, a GIS bridge crane for lifting and maintaining the GIS switchgear is provided on the top of the switch station level.

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention provides an underground GIS layout structure for pumped storage power stations, which integrates key equipment such as pipeline busbars, branch circuit current-limiting reactors, and GIS switchgear into a three-dimensional, layered, and centralized arrangement within the same area of ​​the underground main transformer tunnel. This reduces the land area occupied by the surface outgoing line site and lowers the engineering difficulty and environmental pressure associated with ecological damage and high slope excavation.

[0023] 2. This invention provides an underground GIS layout structure for a pumped storage power station. By employing a phase-separated planar arrangement of branch circuit current-limiting reactors, each reactor is placed in an independent reactor chamber within the pipeline busbar layer, achieving complete isolation between the branch circuit current-limiting reactors and other electrical equipment. In the event of a reactor failure, this effectively prevents impact on nearby busbars and generator voltage circuit equipment, thus preventing the accident from escalating.

[0024] 3. This invention provides an underground GIS layout structure for a pumped storage power station. While meeting the requirements for the installation and operation of the main transformer, it reduces the height of the main transformer layer, thereby correspondingly reducing the installation height of the fire-fighting pipes and ventilation pipes suspended below the top of the main transformer layer. This shortens the length of the suspension rods, reduces the difficulty of pipe installation and the safety hazards caused by high-altitude suspension, and facilitates later operation and maintenance.

[0025] 4. This invention provides an underground GIS layout structure for pumped storage power stations. By increasing the height of the pipeline busbar layer, the starting busbar has vertical space and can be arranged vertically, saving horizontal planar space in the pipeline busbar layer and widening the operation and maintenance passage. At the same time, by setting up partition walls, medium-voltage starting and branch circuit equipment of different voltage levels are separated from high-voltage GIS unit equipment, making the operation, maintenance and management of electrical equipment more standardized and safer. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the electrical system according to an embodiment of the present invention; Figure 2 This is a plan view of the main variable layer in an embodiment of the present invention; Figure 3 This is a plan view of the pipeline busbar layer in an embodiment of the present invention; Figure 4 This is a plan view of the switchyard floor in an embodiment of the present invention; Figure 5 This is a cross-sectional view of the main transformer layer and pipeline busbar layer according to an embodiment of the present invention (corresponding to section 2-2 of the plan layout). Figure 6 This is a longitudinal section view of the main transformer tunnel according to an embodiment of the present invention (corresponding to section 1-1 of the plan layout).

[0027] Figure label: 1. Main transformer; 2. Oil collection tank; 3. Main transformer transport tunnel; 4. Ventilation duct; 5. Partition wall; 6. Independent reactor room; 7. GIS switchgear; 8. GIS bridge crane; 9. High voltage area; 10. Connecting bushing; 11. Fire protection pipeline. Detailed Implementation

[0028] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0029] It should be noted that, unless otherwise specifically stated, the relative arrangement and numerical expressions of the components and steps described in these embodiments should not be construed as limiting the scope of the invention.

[0030] The following description of exemplary embodiments is merely illustrative and is not intended to limit the invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the following description is provided in conjunction with the appendix. Figures 1 to 6 The present invention will be described in detail below.

[0032] like Figure 5 and Figure 6 As shown, this embodiment of the invention provides an underground GIS layout structure for a pumped-storage power station. The entire underground GIS layout structure is located inside the main transformer tunnel formed by underground excavation. The main transformer tunnel is vertically divided into three independent three-dimensional spaces from bottom to top: the main transformer layer, the pipeline busbar layer, and the switchyard layer. Through the above-mentioned three-dimensional layered and centrally coordinated optimized layout, electrical equipment of different voltage levels and functions are respectively placed in the above-mentioned three independent three-dimensional spatial layers, and high and low voltage are separated within the same layer using solid walls. This achieves a unified planning of vertical spatial layering and horizontal planar isolation, significantly reducing the land area occupied by the ground-level cable outlet.

[0033] like Figure 2 , Figure 5 and Figure 6As shown, the main transformer layer is located at the bottom of the main transformer tunnel. The main transformer 1 is installed on the ground inside the main transformer layer. A main transformer transport channel 3 is installed parallel to one side of the main transformer 1. An oil collection tank 2 is recessed directly below the main transformer 1. Fire-fighting pipes 11 and ventilation ducts 4 are fixedly suspended on the bottom surface of the roof slab above the main transformer layer. While meeting the installation and maintenance requirements of the main transformer 1, this embodiment actively reduces the height of the main transformer layer. In existing schemes, SFC output reactors are arranged in the mezzanine of the main transformer layer, resulting in a relatively high floor height and a low floor height for the pipeline busbar layer, leading to limited space. This application adjusts the reactor placement to reduce the height of the main transformer layer, thereby increasing the height of the pipeline busbar layer and making the planar layout space of the pipeline busbar layer more reasonable. Reducing the height of the main transformer layer not only decreases the hoisting height of the fire-fighting pipes 11 and ventilation ducts 4 and shortens the length of the hoisting rods required for the fire-fighting pipes 11, eliminating the safety hazards of high-altitude suspension; at the same time, the vertical space released by lowering the main transformer layer is compensated for by the pipeline busbar layer above it.

[0034] like Figure 3 , Figure 5 and Figure 6 As shown, the busbar layer is located directly above the main transformer layer. The busbar layer contains a partition wall 5 and an independent reactor room 6. In this application, the partition wall 5 is a solid partition wall, vertically positioned between the bottom and top slabs inside the busbar layer. The partition wall 5 divides the busbar layer into two physically isolated areas: one area is a medium-voltage area used for arranging medium-voltage starting and branch circuit equipment, and the other area is used for arranging high-voltage GIS unit equipment, i.e., the high-voltage area.

[0035] The independent reactor compartment 6 is equipped with a partition wall 5. Branch circuit current-limiting reactors are installed on the floor inside the independent reactor compartment 6; in this embodiment, SFC output reactors are preferred. The branch circuit current-limiting reactors are arranged in a single-phase planar configuration on the floor inside the independent reactor compartment 6. Through the partition wall 5 of the independent reactor compartment 6, the branch circuit current-limiting reactors are isolated from other electrical equipment inside the pipeline busbar layer.

[0036] The medium-voltage starting and branch circuit equipment includes a starting busbar. Thanks to the increased vertical height of the aforementioned pipeline busbar layer, the starting busbar's conventional horizontal arrangement has been optimized to a vertical arrangement within the pipeline busbar layer. This vertical arrangement significantly saves horizontal space within the pipeline busbar layer, providing a spatial foundation for the construction of the aforementioned independent reactor room 6 and ensuring ample and unobstructed access for operation and maintenance. Furthermore, disconnect switches and operating mechanisms are also installed within the pipeline busbar layer.

[0037] like Figure 4 , Figure 5 and Figure 6As shown, the switchyard level is located directly above the pipeline busbar level. GIS switchgear 7 is installed on the ground inside the switchyard level. A GIS bridge crane 8 is installed on the top of the switchyard level.

[0038] Example 1 This embodiment provides a specific underground GIS layout structure for a pumped storage power station. In this embodiment, the pumped storage power station preferably has four pumped storage units installed.

[0039] like Figure 1 The diagram illustrates the overall power transmission and equipment connection logic of the pumped storage power station in this embodiment. In this system, four generators (i.e., ...) are located at the bottom. Figure 1 (1G, 2G, 3G, 4G), the four generators are electrically connected to the four main transformers 1 (i.e. Figure 1 The 1T, 2T, 3T, and 4T mentioned here refer to the 1# main transformer 1, 2# main transformer 1, 3# main transformer 1, and 4# main transformer 1 mentioned later in this embodiment.

[0040] In the low-voltage circuit from the generator to the main transformer 1, a static frequency converter (SFC) system and a plant auxiliary power branch circuit are also connected in parallel to meet the unit starting and plant power needs. Among them, the output side of the SFC system is connected to medium-voltage starting and branch circuit equipment such as the SFC output reactor. The SFC output reactor is the aforementioned branch circuit current-limiting reactor.

[0041] To achieve optimized equipment layout, the high-voltage side incoming lines of main transformer 1 and main transformer 2 converge upwards and are connected to the first group of underground GIS joint unit equipment (i.e., joint unit 1 mentioned later); similarly, the high-voltage side incoming lines of main transformer 3 and main transformer 4 converge upwards and are connected to the second group of underground GIS joint unit equipment (i.e., joint unit 2 mentioned later).

[0042] The first and second groups of underground GIS combined unit equipment, which are high-voltage GIS unit equipment, continue to be connected upwards in parallel, and are jointly connected to the GIS switch equipment 7 located at the top floor to realize the output of electrical energy.

[0043] The spatial layout of this application is similar to that described above. Figure 1 The electrical logic is also corresponding: the generator at the bottom corresponds to the bottom floor of the underground plant; the main transformer 1 is located on the main transformer floor; the GIS combined unit equipment, which is a high-voltage GIS unit, as well as medium-voltage starting and branch circuit equipment such as the SFC output reactor, are located on the pipeline busbar floor; and the GIS switchgear 7 is located on the top switch station floor. This achieves a systematic layout with short equipment connection distances and secure isolation within the main transformer tunnel.

[0044] like Figure 2 and Figure 5 As shown, four main transformers are arranged horizontally at intervals on the ground inside the main transformer layer, namely, Main Transformer 1, Main Transformer 1, Main Transformer 1, Main Transformer 1, and Main Transformer 1, Main Transformer 1. Each of the four main transformers is located in an independent transformer room. A high-voltage plant service transformer room is set between Main Transformer 1 and Main Transformer 2, and between Main Transformer 3 and Main Transformer 4.

[0045] like Figure 1 and Figure 3 As shown, within the high-voltage area 9 inside the pipeline busbar layer, there are two interconnected units: Unit 1 and Unit 2. Main transformers 1 and 2 are each connected to vertically upward-facing connecting bushings 10. The incoming lines of both main transformers 1 and 2 pass upward through the floor slab and are electrically connected to Unit 1. Similarly, main transformers 1 and 4 are also connected to vertically upward-facing connecting bushings 10. The incoming lines of both main transformers 1 and 4 pass upward through the floor slab and are electrically connected to Unit 2.

[0046] like Figure 3 and Figure 5 As shown, an SFC output reactor is installed in the independent reactor chamber 6 inside the pipeline busbar layer. The SFC output reactor, as a branch circuit current-limiting reactor, is arranged in a single-phase plane on the floor inside the independent reactor chamber 6. The partition wall 5 isolates the SFC output reactor, the starting busbar, and the No. 1 and No. 2 combined units in the high-voltage area.

[0047] like Figure 4 As shown, a GIS switchgear 7 is installed on the ground inside the switchyard level. The No. 1 and No. 2 combined units inside the pipeline busbar level pass upward through the floor slab via pipeline busbars and are electrically connected to the GIS switchgear 7 inside the switchyard level.

[0048] Through the above arrangement, the four generator-transformer units are combined in pairs, achieving three-dimensional isolation of high and low voltage equipment in the narrow underground main transformer tunnel. This fully utilizes the vertical height of the pipeline busbar layer, ensuring that the safe operation and maintenance of the medium-voltage starting equipment and the high-voltage combined unit equipment do not interfere with each other.

[0049] The above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. An underground GIS layout structure for a pumped storage power station, characterized in that: The underground GIS layout structure is set up inside the main transformer tunnel formed by underground excavation. The main transformer tunnel is divided into the main transformer layer, pipeline busbar layer and switch station layer from bottom to top in the vertical direction. The main transformer is installed on the ground inside the main transformer layer; The pipeline busbar layer is located directly above the main transformer layer. The pipeline busbar layer contains a starting busbar, a branch circuit current-limiting reactor, a high-voltage GIS unit device, and a partition wall. The starting busbar is vertically fixed inside the pipeline busbar layer. An independent reactor room is also provided inside the pipeline bus layer. The branch circuit current-limiting reactor is installed on the ground inside the independent reactor room, and the branch circuit current-limiting reactor is placed in a phase-separated planar arrangement in the independent reactor room. The partition wall is vertically installed between the bottom plate and the top plate inside the pipeline busbar layer. The high-voltage GIS unit equipment is spatially isolated from the starting busbar and the independent reactor room through the partition wall. The high-voltage side incoming line of the main transformer passes upward through the pipeline busbar layer and is electrically connected to the high-voltage GIS unit equipment. The high-voltage GIS unit equipment is then electrically connected upward to the GIS switchgear inside the switch station layer.

2. The underground GIS layout structure of a pumped storage power station according to claim 1, characterized in that: The height of the pipeline busbar layer is configured such that it can accommodate a vertical space in which the starting busbar is arranged vertically.

3. The underground GIS layout structure of a pumped storage power station according to claim 1, characterized in that: The height of the main transformer floor is configured to be a preset net height that can safely accommodate the main transformer and its top auxiliary facilities.

4. The underground GIS layout structure of a pumped storage power station according to claim 1, characterized in that: A suspension rod is fixedly installed on the bottom surface of the top plate above the main transformer layer, and the fire-fighting pipeline and ventilation pipeline are suspended and fixed above the main transformer through the suspension rod.

5. The underground GIS layout structure of a pumped storage power station according to claim 1, characterized in that: The partition wall divides the pipeline busbar layer into two isolated areas, one of which is a medium-voltage area, used to house the starting busbar, the independent reactor room, the disconnect switch and the operating mechanism. The other side is a high-voltage area, used to house the high-voltage GIS unit equipment.

6. The underground GIS layout structure of a pumped storage power station according to claim 1, characterized in that: The walls of the independent reactor room are solid isolation walls, and the branch circuit current-limiting reactors are SFC output reactors. The SFC output reactors are arranged in a straight line on the floor inside the independent reactor room in a phase-separated plane.

7. The underground GIS layout structure of a pumped storage power station according to claim 1, characterized in that: Multiple main transformers are arranged at intervals along the horizontal direction inside the main transformer layer.

8. The underground GIS layout structure of a pumped storage power station according to claim 7, characterized in that: Two adjacent main transformers are respectively connected to vertically upward connecting bushings. The high-voltage side incoming line of the main transformer passes through the connecting bushings upward through the floor slab and is electrically connected to a group of high-voltage GIS unit equipment in the pipeline bus layer. The high-voltage GIS unit equipment then passes upward through the floor slab of the pipeline bus layer and is electrically connected to the GIS switch equipment inside the switch station layer.

9. The underground GIS layout structure of a pumped storage power station according to claim 1, characterized in that: A main transformer transport channel is arranged parallel to one side of the main transformer inside the main transformer layer, and an oil collection pool is recessed in the bottom plate directly below the main transformer.

10. The underground GIS layout structure of a pumped storage power station according to claim 1, characterized in that: The top of the switch station floor is equipped with a GIS bridge crane for lifting and maintaining the GIS switchgear.

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