Fabricated building structure of transformer substation

Abstract

The invention relates to a fabricated building structure of a transformer substation. The fabricated building structure comprises a building external envelope structure and a building internal structure, the building outer envelope structure comprises a building outer wall and a building outer window arranged on the building outer wall, the building outer wall is an integrated aluminum-magnesium-manganese composite outer wall plate, the integrated aluminum-magnesium-manganese composite outer wall plate comprises an inner-layer aluminum-magnesium-manganese alloy plate, an outer-layer aluminum-magnesium-manganese alloy plate and a rock wool core material located in the middle, and the building outer window is a glass fiber reinforced polyurethane energy-saving window; the building internal structure comprises an internal partition wall, steel structure columns, an integrated complete set of toilets and steel structure floor slabs, the internal partition wall is made of light steel keel gypsum composite finished plates, and inorganic pre-coating plates are laid on the outer sides of the internal partition wall; the steel structure column is coated with a fiber reinforced silicate plate, and a cement fiber plate is attached to the outermost side of the steel structure column. The steel structure floor slab is a cast-in-place reinforced concrete floor slab with a profiled steel sheet as a bottom film. Compared with the prior art, the invention has the advantages of fire prevention, heat preservation, long service life, convenience in installation, good noise reduction effect and the like.

Description

Technical Field

[0001] The invention relates to the field of transformer substation structures, and in particular to an assembled building structure of a transformer substation. Background Art

[0002] A substation is a high-voltage substation that converts high-voltage electrical energy into low-voltage electrical energy. Its main purpose is to distribute electricity from the high-voltage transmission grid to the low-voltage grid and supply electricity to urban, rural and industrial areas.

[0003] Most of the existing substations are general concrete building structures, which have hidden dangers in fire prevention, air tightness, pipeline safety and noise reduction performance.

[0004] Although there are proposals to adopt assembled steel structure building solutions, such as the invention disclosed in the publication number CN115288298A, which discloses an assembled steel structure building, including: a main steel structure system, which supports the main body of the building; an assembled floor system, which is assembled and supported on the main steel structure system to form a floor; an exterior wall system, which is assembled and installed on the main steel structure system to form an exterior wall; an interior partition wall system, which is assembled and installed on the main structure to form an interior partition wall; all the supporting parts of the overhead floor panels of the assembled floor system are damped by liquid in the process of reducing the support height under pressure, and the liquid has the characteristic of solidifying within a set time range.

[0005] However, for the application scenario of substations, since they are highly dangerous electrical equipment with great fire and combustion hazards, the fire protection and air tightness of existing building plans cannot meet the safe operation requirements of substations. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a fire-proof, heat-insulating and long-service-life assembled building structure for a substation.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] An assembled building structure of a substation, comprising an external building envelope structure and an internal building structure;

[0009] The building exterior enclosure structure includes a building exterior wall and building exterior windows arranged on the building exterior wall, the building exterior wall is an integrated aluminum-magnesium-manganese composite exterior wall panel, the integrated aluminum-magnesium-manganese composite exterior wall panel includes two layers of aluminum-magnesium-manganese alloy plates inside and outside and a rock wool core material located in the middle, and the building exterior windows are glass fiber reinforced polyurethane energy-saving windows;

[0010] The internal structure of the building includes interior partition walls, steel structure columns, integrated toilets and steel structure floors. The interior partition walls are made of light steel keel gypsum composite finished panels, with inorganic pre-coated panels on the outside; the steel structure columns are coated with fiber-reinforced silicate panels, and cement fiber panels are attached to the outermost side; the steel structure floors are cast-in-place reinforced concrete floors with corrugated steel plates as the base membrane;

[0011] The steel structure columns are connected to the building exterior wall by permanent and temporary combination technology, the vertical junction between the inner partition wall and the building exterior wall is fireproofed by fireproof gypsum board, the inner partition wall and the steel structure columns are connected to the steel structure floor, and the integrated toilet is supported by the inner partition wall, steel structure columns or steel structure floor;

[0012] A knock-out baffle sleeve and a cable variable diameter sealing member are arranged in the cable layer wall penetration hole of the building outer wall.

[0013] Furthermore, the surface of the aluminum-magnesium-manganese alloy plate is coated with fluorocarbon roller coating.

[0014] Furthermore, the prefabricated building structure is provided with a main transformer room and a reactor room. The main transformer room is used to arrange the body of the main transformer of the substation, and the reactor room is used to arrange the body of the reactor of the substation. The main transformer and the reactor are both arranged in a separate form with the body and the heat sink.

[0015] Furthermore, the main transformer chamber and the reactor chamber are both provided with ventilation openings, and the ventilation openings are provided with sound-absorbing shutters.

[0016] Furthermore, the prefabricated building structure forms a multi-layer structure through the building exterior envelope structure and the building internal structure, including an underground floor, a first floor and two above-ground floors. The underground floor is a cable layer, the first floor is provided with a main transformer room, a 110kV distribution device room, a 10kV distribution device room, a 10kV reactor room, a station transformer room, a grounding resistance room and a toilet, and the two above-ground floors are provided with a main transformer radiator room, a capacitor room, a secondary equipment room, a spare parts room, a safety tool room, a battery room and a lifting platform.

[0017] Furthermore, the main transformer room is installed with a main transformer, which is a three-phase double-winding oil-immersed on-load voltage-regulating fully self-cooling transformer.

[0018] Furthermore, the 110kV side lead of the main transformer adopts steel-core aluminum stranded wire and fully cross-linked power cable, and the low-voltage side lead of the main transformer adopts an insulated busbar; the substation's in-station power consumption and reactive power compensation high-voltage side cables adopt fully cross-linked power cables, and the cable line pipes in the prefabricated building structure are all HPVC pipes.

[0019] Furthermore, the 110kV power distribution device room is installed with a gas-insulated metal-enclosed switchgear, and the 10kV power distribution device room is installed with a metal-armored removable switchgear equipment.

[0020] Furthermore, the 10kV power distribution device room and the secondary equipment room are provided with a DC system battery, and the DC system battery includes a parallel lithium titanate battery module and a parallel lithium titanate battery module.

[0021] Furthermore, the lighting fixtures in the prefabricated building structure are all LED lamps.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] (1) The prefabricated building structure of the substation proposed in the present invention adopts a lightweight plate composed of two layers of aluminum-magnesium-manganese alloy plates and a rock wool core material for the building exterior wall. The aluminum-magnesium-manganese alloy surface is coated with fluorocarbon rollers, and the core material is rock wool with a fireproof performance of Class A. It has the advantages of high corrosion resistance, aging resistance, fire resistance, and long service life. Seamless corner plates are used at corners and door and window openings, and the overall fireproof, heat preservation, waterproof and decorative properties are excellent;

[0024] For the exterior windows on the building's exterior walls, glass fiber reinforced polyurethane energy-saving windows are used, and the glass uses double-layer hollow laminated glass to reduce the intensity of radiation heat transfer and improve the insulation effect of doors and windows;

[0025] Fireproof gypsum board is used for fireproof blocking at the junction of the internal partition wall and the building's exterior wall;

[0026] In the internal structure of the building, the inner partition walls are made of light steel keel gypsum composite finished boards, and the outer side is coated with inorganic pre-coated boards, which can be directly assembled and easy to install; the steel structure columns are covered with 32mm thick fiber-reinforced silicate boards, and the cement fiber boards on the outside are consistent with the interior wall finishes. No keel is required, no fire-retardant coating is required, and the fire resistance limit can reach 3 hours.

[0027] (2) The steel structure column of the present invention is connected to the building exterior wall through a permanent and temporary combination technology. The exterior wall keel can be used as a construction safety protection during the construction process. It is easy to install and has multiple uses, saving materials, saving time and labor, and being economical and practical.

[0028] (3) The present invention provides a knockout baffle sleeve and a cable variable diameter seal in the cable layer wall hole. The knockout baffle sleeve can cooperate with the cable variable diameter seal to flexibly adjust the outer diameter of the cable, thereby solving the problem of loose sealing and achieving waterproof, airtight and fire-resistant sealing effects. When there is no cable passing through, a modular plug can be used for sealing to achieve the same sealing effect.

[0029] (4) The present invention is designed with full consideration of the requirements for ventilation and noise reduction. The main transformer and reactor are both arranged separately, and the main equipment with high noise is arranged in a closed room to block the leakage of its low-frequency noise. Necessary ventilation holes are opened on the wall, and sound-absorbing shutters with both ventilation and noise reduction are used to achieve an overall noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention provides a schematic structural diagram of an assembled building structure of a substation in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] Example 1

[0038] like Figure 1 As shown, this embodiment provides an assembled building structure of a substation, including a building exterior structure and a building interior structure;

[0039] The building exterior envelope structure includes a building exterior wall and building exterior windows arranged on the building exterior wall. The building exterior wall is an integrated aluminum-magnesium-manganese composite exterior wall panel, which includes two layers of aluminum-magnesium-manganese alloy plates inside and outside and a rock wool core material located in the middle. The building exterior windows are glass fiber reinforced polyurethane energy-saving windows;

[0040] The internal structure of the building includes interior partition walls, steel structure columns, integrated toilets and steel structure floor slabs. The interior partition walls are made of light steel keel gypsum composite finished panels, and the outer side is coated with inorganic pre-coated panels; the steel structure columns are covered with fiber-reinforced silicate boards, and the outermost side is affixed with cement fiber boards; the steel structure floor slabs are cast-in-place reinforced concrete slabs with corrugated steel plates as the base membrane;

[0041] The steel structure columns are connected to the building exterior wall through the permanent and temporary combination technology. The vertical junction between the inner partition wall and the building exterior wall is fireproofed with fireproof gypsum board. The inner partition wall and the steel structure columns are connected to the steel structure floor slab. The integrated bathroom is supported by the inner partition wall, steel structure columns or steel structure floor slab.

[0042] The cable layer through-wall hole on the building's exterior wall is provided with a knock-out baffle sleeve and a cable variable diameter seal;

[0043] The prefabricated building structure forms a multi-layer structure through the building envelope structure and the building internal structure, including an underground floor, a first floor and two above-ground floors. The underground floor is a cable layer, the first floor is equipped with a main transformer room, a 110kV distribution device room, a 10kV distribution device room, a 10kV reactor room, a station transformer room, a grounding resistance room and a toilet, and the second above-ground floor is equipped with a main transformer radiator room, a capacitor room, a secondary equipment room, a spare parts room, a safety tool room, a battery room and a lifting platform.

[0044] The above scheme is described in detail below.

[0045] 1. Building exterior structure

[0046] 1.1. The exterior walls of the building are made of reusable materials: aluminum-magnesium-manganese wall panels. Aluminum-magnesium-manganese wall panels are lightweight panels composed of two layers of aluminum-magnesium-manganese alloy plates and rock wool core materials. The surface of the aluminum-magnesium-manganese alloy is coated with fluorocarbon rollers, and the core material uses rock wool with fireproof performance of Class A. It has high corrosion resistance and aging resistance, and its service life can reach 50 years, which is synchronized with the building. It also has the characteristics of light weight, high strength, corrosion resistance, and good plasticity. The exterior facade of the building adopts a refined design, and the specifications of the assembled exterior wall panels and the door and window modules are coordinated and unified to avoid cutting of the exterior wall panels. According to the requirements of innovation, the aluminum-magnesium-manganese wall panels are arranged horizontally, and the edges are tongue-and-groove on all four sides; the corners and door and window openings use seamless corner panels, which have excellent overall fire prevention, heat preservation, waterproof and decorative properties.

[0047] 1.2. The building's exterior windows use glass fiber reinforced polyurethane energy-saving windows. The glass uses double-layer hollow laminated glass (hollow 12mm), with wind pressure resistance of level 3, air tightness of level 6, and water tightness of level 3. The heat transfer coefficient of doors and windows is not more than 2.2W / (㎡K), which has good thermal insulation performance, reduces the intensity of radiation heat transfer, and improves the thermal insulation effect of doors and windows.

[0048] 1.3. No decorative wall is set up on the inner side of the exterior wall. The pipelines located on the exterior wall are exposed, and the pipelines are arranged neatly and beautifully through comprehensive and in-depth design. Fireproof gypsum board is used for fireproof blocking at the vertical junction of the interior partition wall and the exterior wall.

[0049] 2. Partition walls and interior decoration of buildings

[0050] 2.1. The interior partition walls of the substation building are made of light steel keel gypsum composite finished board, and the outer side is coated with inorganic pre-coated board. All indoor finished surfaces are completed once in the wall assembly project, and no secondary decoration is required; all decoration materials involved do not contain harmful gases such as formaldehyde.

[0051] 2.2. The steel structure columns are covered with 32mm thick fiber reinforced silicate boards, and the cement fiber boards are pasted on the outside to keep consistent with the interior wall finish. No keel is required, no fire retardant coating is required, and the fire resistance limit can reach 3 hours.

[0052] 2.3. Use factory-prefabricated integrated bathrooms. The bathroom enclosure structure, sanitary ware and pre-buried pipelines are all prefabricated in the factory and installed as a whole on site without assembly, waste materials, and easy maintenance.

[0053] 2.4. According to the specific terrain, adopt a reasonable foundation treatment plan to reduce environmental pollution. In this embodiment, it is considered that the building foundation falls on the bearing layer. The foundation can meet the building settlement requirements, so the building adopts a natural foundation.

[0054] 2.5. After the substation enters the formal construction stage, premixed concrete should be used in principle; premixed mortar should be used; and mechanical connection should be used for steel bar connection.

[0055] 2.6. The steel structure floor adopts cast-in-place reinforced concrete floor with support-free corrugated steel plate as the base membrane. Except for the parts that must be welded according to the regulations, other steel structure connections are bolted to reduce on-site welding.

[0056] 2.7. Multifunctional enclosure

[0057] This project uses multifunctional enclosure technology. The steel structure building uses a permanent and temporary exterior wall structure. The exterior wall keel also serves as a construction safety protection. It is easy to install, multi-purpose, saves materials, saves time and effort, and is economical and practical.

[0058] 2.8. Knock-out baffle sleeve

[0059] In order to meet the requirements of waterproof treatment of cable trenches and waterproof structural measures for cable penetration and sealing, the substation cable layer adopts cable variable diameter seals for the holes through the outer wall, and the civil engineering adopts knock-out baffle sleeves. The knock-out baffle sleeve can be used with the cable variable diameter seals to flexibly adjust according to the outer diameter of the cable, solving the problem of loose sealing and achieving waterproof, airtight and fire-resistant sealing effects. When there is no cable crossing, modular plugs can be used to achieve the same sealing effect.

[0060] 2.9 HVAC design

[0061] Active energy-saving technology is adopted, HVAC equipment is preferred, and low-noise air-conditioning and ventilation equipment are selected to reduce the noise impact of equipment operation on the factory boundary. R410A environmentally friendly refrigerant is used. R410A (HFC) refrigerant does not contain chlorine and will not chemically react with ozone. The ozone depletion coefficient (ODP) is zero, meeting the requirements of green environmental protection.

[0062] 3. Room layout

[0063] 3.1. Under the premise of meeting the requirements of safety, reliability, advanced technology, economic rationality, and convenient operation and maintenance, the design of the power distribution device adheres to the principle of land conservation, with compact and reasonable layout. The main transformer and 110kV GIS are arranged indoors. The entire substation adopts a power distribution device building, of which the underground floor is the cable layer; the first floor has the main transformer room, 110kV power distribution device room, 10kV power distribution device room, 10kV reactor room, station transformer room, grounding resistance room, and toilet; the second floor is arranged with the main transformer radiator room, capacitor room, secondary equipment room, spare room, safety tool room, battery room, and lifting platform; a power supply duty room is arranged on the roof; the cable layer is arranged with a fire pump room. The accident oil pool is arranged within the station area wall.

[0064] 3.2 Equipment selection

[0065] The main transformer uses a three-phase double-winding oil-immersed on-load tap-changing fully self-cooled transformer, the 110kV distribution device uses gas-insulated metal-enclosed switchgear (GIS), and the 10kV distribution device uses metal-armored removable switchgear equipment. The main equipment requires little maintenance throughout its life cycle, consumes low energy, occupies little space, and is environmentally friendly.

[0066] 3.3. Main electrical connection

[0067] The main electrical connections of this station include: 110kV side adopts one-input and three-output (including transformer) connection, 10kV side adopts single busbar six-section and single busbar four-section connection. Each main transformer on the 10kV side is equipped with 2 sets of (6000+6000) kvar capacitors and 1 set of 6000 kvar reactor compensation.

[0068] 3.4 Conductor selection

[0069] The 110kV side lead wires of the main transformer in the substation are made of steel-core aluminum stranded wire and fully cross-linked power cables, the low-voltage side lead wires of the main transformer are made of insulated busbars, and the high-voltage side cables for station power and reactive power compensation are made of fully cross-linked power cables, all of which meet the current carrying capacity and thermal stability requirements.

[0070] 3.5. Main transformer energy efficiency selection

[0071] The 110kV main transformer of this station adopts a three-phase double-winding oil-immersed on-load voltage-regulating power transformer, 50MVA, 110 / 10kV. The main transformer adopts a high-efficiency energy-saving power transformer with a level 2 energy efficiency in accordance with the "Energy Efficiency Limits and Energy Efficiency Grades for Power Transformers" GB 20052-2020, with a no-load loss of no more than 24.8kW and a load loss of no more than 175kW. Compared with the lowest level 3 energy efficiency transformer in GB 20052, the no-load loss value of the equipment selected for this project has decreased by 19%, and the load loss has decreased by 4.9%, which is highly efficient and energy-saving.

[0072] 3.6. Energy-saving measures for station transformers

[0073] This station is equipped with two 100kVA low-loss electrical steel strip core station transformers with a transformation ratio of 10.5±5% / 0.4~0.23kV. The station transformers are selected to meet the Class 1 energy efficiency of the "Energy Efficiency Limit Values ​​and Energy Efficiency Grades of Power Transformers" GB 20052-2020. The no-load loss is not more than 230W, and the load loss is not more than 1330W. Compared with the distribution transformers in the State Grid Enterprise Standard, the no-load loss value of the equipment selected for this project has decreased by 28.1%, and the load loss has decreased by 10.1%, which is highly efficient and energy-saving. At the same time, the station transformers of this project use dry-type oil-free transformer equipment, which is not only smaller in size than oil-immersed equipment, but also does not require matching oil pits, oil pools and oil drainage pipelines, saving floor space and improving fire safety reliability.

[0074] 3.7. Main transformer cooling method

[0075] The cooling method of the main transformer of this station adopts self-cooling, which reduces the additional loss of the oil circuit and improves reliability. The use of self-cooling transformers can reduce the additional power loss of air-cooling equipment, reduce the number of failure points, improve reliability, and reduce the workload of operation and maintenance. Compared with air-cooled transformers of the same specifications, self-cooling transformers can reduce the installed power of the fan.

[0076] 3.8 System layout optimization and noise pollution prevention

[0077] The transformer and reactor are arranged in a separate body and heat sink. The transformer and reactor bodies are enclosed indoors to block the leakage of their low-frequency noise. Sound-absorbing structures are laid on the walls of the reactor room and the main transformer room to reduce the reverberation formed by multiple reflections of noise in the room, and ultimately reduce its impact on the factory boundary. Effective vibration reduction, sound insulation and sound absorption measures are taken at the installation site of the main transformer. The foundation of the 10kVkV shunt reactor is set independently, disconnected from the surrounding floor slabs, and not connected to the building structure, reducing the impact of vibration and noise.

[0078] The 110kV main transformer uses low-noise transformer products, the noise level is required to be no more than 58dB, and the main transformer radiator noise is required to be no more than 45dB; the noise level of the 10kV oil-immersed iron core shunt reactor is ≤65dB.

[0079] The main transformer and reactor are arranged separately, and the main equipment with high noise is arranged in a closed room. The necessary vents on the wall must be strictly calculated and selected in size, and silencer shutters with both ventilation and noise reduction are used. Under normal working conditions, natural ventilation is preferred to reduce operating energy consumption;

[0080] The GIS control cabinet is required to operate normally at room temperature of 40°C. There is no air conditioning system in the room, and the design principle of "cooling the equipment first, then cooling the environment" is followed. The heat of the control cabinet is discharged to the GIS room through the heat dissipation system in the cabinet, and then discharged to the outside through the ventilation system of the GIS room, which can save the investment in the air conditioning system and its operating energy consumption.

[0081] Natural ventilation is preferred in rooms such as the main transformer and reactor room. When natural ventilation does not meet the indoor ambient temperature requirements, mechanical exhaust is started to assist in cooling, and variable frequency control mode is used to reduce energy consumption.

[0082] Temperature control should be considered for rooms with electrical equipment equipped with mechanical ventilation systems. The operating status of the ventilation equipment can be controlled by the room temperature conditions, thereby saving energy consumption during ventilation system operation.

[0083] 3.9 Cable laying

[0084] This station is an indoor substation. The cables inside the station are connected through the cable layer and cable shaft bridge box. The external high-voltage cables are all exited to the south according to the cable channel conditions outside the station. They pass through the south outer wall of the cable layer and exit the station directly via the shortest path. There are also east and west side outlet channels that turn to the south immediately after leaving the cable layer.

[0085] All high-voltage cables, low-voltage power cables, electrical wires and control cables of various voltage levels in the station are halogen-free and fully cross-linked flame-retardant types.

[0086] Cable line pipes are all made of HPVC pipes. Compared with traditional MPP pipes, HPVC pipes have high mechanical strength. Under the same pressure resistance, the pipe wall thickness is only 3 / 5 of that of MPP. HPVC pipes are flame-retardant materials with a vertical combustion rating of V0, which will extinguish when away from the fire; MPP is a flammable material that will continue to burn away from the fire source. HPVC pipe technology requires the use of high-purity materials, and the materials are acid and alkali resistant, so the underground service life can reach hundreds of years.

[0087] 3.10 Cable blocking

[0088] The cable layer of the substation uses a cable variable diameter seal for the hole through the outer wall. The cable variable diameter seal is installed in the pre-buried water-blocking flange of the civil engineering. The module material is EPDM rubber, which can prevent animals from biting. Its structural level can be flexibly adjusted according to the outer diameter of the cable, solving the problem of loose sealing and achieving waterproof, airtight and fire-resistant sealing effects.

[0089] 3.11 AC grounding

[0090] The main grounding grid of the whole station adopts a composite grounding grid with horizontal grounding electrodes as the main body and vertical grounding electrodes as the auxiliary body. The outdoor horizontal grounding electrodes are 120mm 2 Copper stranded wire, outdoor lead-in indoor grounding body adopts -40*4mm 2 In addition to the artificial grounding electrodes mentioned above, making full use of the large floor plate and pile foundation of the building as natural grounding electrodes within the building can further reduce the grounding resistance value of this project, reduce the step voltage and contact voltage levels, and provide overall safety for the substation.

[0091] 3.12. Terminal boxes and control boxes use automatic moisture control devices

[0092] The terminal box and control box arranged outdoors at this station, as well as the control box arranged in the fire pump room, all use moisture-removal automatic control devices to set automatic start and stop temperature and humidity, which saves energy while improving equipment reliability and adapts to the characteristics of high temperature and high humidity in summer and low temperature and high humidity in winter in Shanghai.

[0093] Example 2

[0094] This embodiment is substantially the same as Embodiment 1, except that this embodiment adopts lithium titanate battery technology instead of traditional lead-acid batteries as DC system batteries. In this project embodiment, the 10kV power distribution device room and the secondary equipment room can be equipped with 14 groups of 12.25V / 90Ah parallel lithium titanate battery modules and 22 groups of 12.25V / 180Ah parallel lithium titanate battery modules respectively.

[0095] At present, lithium titanate batteries have been used in new energy vehicles and energy storage systems. Lithium titanate batteries have the following advantages:

[0096] 1) Safe and reliable: The potential of lithium titanate is higher than that of pure metallic lithium, it is not easy to produce lithium dendrites, the discharge voltage is stable, and the safety performance is high. Tests of lithium titanate batteries have found that they do not smoke, catch fire, or explode under harsh tests such as needle puncture, extrusion, and short circuit, and are much safer than other lithium batteries.

[0097] 2) Green and environmentally friendly: Lithium titanate battery materials do not contain any heavy metals and rare metals, are non-toxic, and are pollution-free during production and use. They comply with European RoHS regulations and are green and environmentally friendly batteries.

[0098] 3) Long life: The number of complete charge and discharge cycles of lithium titanate batteries can reach more than 10,000 times, and the battery life can reach more than 15 years, which is more than twice that of existing lead-acid batteries. The DC power supply system of the substation does not need to replace the battery during the entire life cycle, and there is almost no increase in later costs.

[0099] In summary, lithium titanate batteries are safer, more reliable, and more environmentally friendly. Although the initial investment cost is 2 to 3 times higher than that of lead-acid batteries, from the perspective of the entire life cycle, the total investment is basically the same as that of traditional lead-acid batteries.

[0100] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An assembled building structure of a substation, characterized in that: Includes building envelope and building interior structure; The building exterior enclosure structure includes a building exterior wall and building exterior windows arranged on the building exterior wall, the building exterior wall is an integrated aluminum-magnesium-manganese composite exterior wall panel, the integrated aluminum-magnesium-manganese composite exterior wall panel includes two layers of aluminum-magnesium-manganese alloy plates inside and outside and a rock wool core material located in the middle, and the building exterior windows are glass fiber reinforced polyurethane energy-saving windows; The internal structure of the building includes interior partition walls, steel structure columns, integrated toilets and steel structure floors. The interior partition walls are made of light steel keel gypsum composite finished panels, with inorganic pre-coated panels on the outside; the steel structure columns are coated with fiber-reinforced silicate panels, and cement fiber panels are attached to the outermost side; the steel structure floors are cast-in-place reinforced concrete floors with corrugated steel plates as the base membrane; The steel structure columns are connected to the building exterior wall by permanent and temporary combination technology, the vertical junction between the inner partition wall and the building exterior wall is fireproofed by fireproof gypsum board, the inner partition wall and the steel structure columns are connected to the steel structure floor, and the integrated toilet is supported by the inner partition wall, steel structure columns or steel structure floor; A knock-out baffle sleeve and a cable variable diameter sealing member are arranged in the cable layer wall penetration hole of the building outer wall.

2. The assembled building structure of a substation according to claim 1, characterized in that: The surface of the aluminum-magnesium-manganese alloy plate is coated with fluorocarbon roller coating.

3. The assembled building structure of a substation according to claim 1, characterized in that: The assembled building structure is provided with a main transformer room and a reactor room. The main transformer room is used to arrange the main body of the main transformer of the substation, and the reactor room is used to arrange the main body of the reactor of the substation. Both the main transformer and the reactor are arranged in the form of separate bodies and heat sinks.

4. The assembled building structure of a substation according to claim 3, characterized in that: The main transformer room and the reactor room are both provided with ventilation openings, and the ventilation openings are provided with sound-absorbing shutters.

5. The assembled building structure of a substation according to claim 1, characterized in that: The prefabricated building structure forms a multi-layer structure through the building exterior envelope structure and the building internal structure, including an underground floor, a first floor and two above-ground floors. The underground floor is a cable layer, the first floor is provided with a main transformer room, a 110kV distribution device room, a 10kV distribution device room, a 10kV reactor room, a station transformer room, a grounding resistance room and a toilet, and the two above-ground floors are provided with a main transformer radiator room, a capacitor room, a secondary equipment room, a spare parts room, a safety tool room, a battery room and a hoisting platform.

6. The assembled building structure of a substation according to claim 5, characterized in that: The main transformer room is equipped with a main transformer, which is a three-phase double-winding oil-immersed on-load voltage-regulating fully self-cooling transformer.

7. The assembled building structure of a substation according to claim 6, characterized in that: The 110kV side leads of the main transformer adopt steel-core aluminum stranded wire and fully cross-linked power cable, and the low-voltage side leads of the main transformer adopt insulated busbars; the substation's in-station power consumption and reactive power compensation high-voltage side cables adopt fully cross-linked power cables, and the cable line pipes in the prefabricated building structure are all HPVC pipes.

8. The assembled building structure of a substation according to claim 5, characterized in that: The 110kV power distribution device room is installed with gas-insulated metal-enclosed switchgear, and the 10kV power distribution device room is installed with metal-armored removable switch cabinet equipment.

9. The assembled building structure of a substation according to claim 5, characterized in that: The 10kV power distribution device room and the secondary equipment room are provided with a DC system battery, which includes a parallel lithium titanate battery module and a parallel lithium titanate battery module.

10. The assembled building structure of a substation according to claim 1, characterized in that: The lighting fixtures in the prefabricated building structure are all LED lamps.

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