Fully-immersed integrated underground transformer substation

Abstract

The invention discloses a full-immersion integrated underground transformer substation, belongs to the field of transformer substations, and aims to greatly reduce the space of the underground transformer substation and save equipment and transformer substation construction cost. Comprising a cabin body which is divided into a plurality of cabins, and the plurality of cabins of the cabin body are respectively a transformation function cabin, a medium-voltage function cabin, a low-voltage function cabin, a reactive compensation function cabin, a station transformer function cabin and a control cabin; insulating incombustible liquid is injected into the transformer function cabin, the medium-voltage function cabin, the low-voltage function cabin, the reactive compensation function cabin and the station transformer function cabin; functional parts in the cabin are all completely soaked in the insulating incombustible liquid. The problem that the live-line distance and the arrangement distance of live-line equipment in the air need to be considered is avoided, and the occupied space and the manufacturing cost of the underground substation are greatly saved. Except for the equipment in the control cabin, other functional parts do not need shells of various equipment, so that the cost and the space caused by the shells are reduced; the insulating non-combustible liquid plays a certain fireproof role, and the fire protection problem of the underground transformer substation is solved.

Description

Technical Field

[0001] The present invention relates to the field of transformer substations, in particular to a fully immersed integrated underground transformer substation. Background Art

[0002] Underground substation is one of the main construction forms of substation, which is a substation built underground. The existing underground substation basically adopts the form of underground indoor conventional station, that is, a layer is set up underground, and transformers, medium-voltage distribution equipment, low-voltage distribution equipment, reactive power compensation equipment, station transformers and other substation equipment and corresponding control equipment are placed in different rooms, and these substation equipment are connected by conductors such as cables. The transformer includes a transformer function winding assembly for transformer function and various insulating, supporting and wrapping shells surrounding the transformer function winding assembly, as well as high-voltage, medium-voltage and low-voltage bushings; the medium-voltage distribution equipment includes a medium-voltage output functional part for medium-voltage output and various insulating, supporting and wrapping shells surrounding the medium-voltage output functional part; the low-voltage distribution equipment includes a low-voltage output functional part for low-voltage output and various insulating, supporting and wrapping shells surrounding the low-voltage output functional part; the reactive power compensation equipment includes a reactive power compensation functional part for reactive power compensation and various insulating, supporting and wrapping shells surrounding the reactive power compensation functional part; the station transformer includes a station transformer function winding assembly for providing station power for underground substations and various insulating, supporting and wrapping shells surrounding the station transformer function winding assembly. At the same time, fire-fighting, ventilation and environmental protection equipment need to be arranged in each room, and the construction of the room fully considers fire prevention measures to form a complete fire protection system. The existing underground substations have the following disadvantages: First, placing various separate high-voltage electrical equipment in the air requires considering the charged distance and layout distance of the charged equipment in the air, which will inevitably take up a lot of space, greatly increasing the overall space and cost of the underground substation.

[0003] Secondly, these transformers, medium-voltage distribution equipment, low-voltage distribution equipment, reactive compensation equipment, station transformers and other substation equipment all include core functional parts for transformation and various insulating, supporting and wrapping shells. The material cost and production cost of these insulating, supporting and wrapping shells are high, and the installation of core functional parts into various insulating, supporting and wrapping shells requires assembly costs, which makes the substation equipment expensive, and in turn leads to high costs for substation construction; moreover, the insulation, support and wrapping shells of the equipment cause the equipment to be large in size and occupy a large space.

[0004] Second, the large number of fire-fighting equipment and complicated fire-prevention measures further increase the cost of the substation and take up extra space.

[0005] Third, the construction of underground equipment rooms increases the cost of the substation and also takes up a lot of space. Summary of the invention

[0006] The purpose of the present invention is to provide a fully immersed integrated underground substation, which greatly reduces the space of the underground substation and saves equipment and substation construction costs.

[0007] The technical solution adopted by the present invention is: a fully immersed integrated underground substation, including a cabin body divided into multiple cabins, wherein the multiple cabins of the cabin body are respectively a transformer function cabin, a medium voltage function cabin, a low voltage function cabin, a reactive power compensation function cabin, a station transformer function cabin and a control cabin; a transformer function winding assembly is arranged in the transformer function cabin; a medium voltage output functional component is arranged in the medium voltage function cabin; a low voltage output functional component is arranged in the low voltage function cabin; a reactive power compensation functional component is arranged in the reactive power compensation function cabin; a station transformer function winding assembly is arranged in the station transformer function cabin; only the transformer function cabin, the medium voltage function cabin, the low voltage function cabin, the reactive power compensation function cabin and the station transformer function cabin are filled with insulating non-flammable liquid; the functional components in the transformer function cabin, the medium voltage function cabin, the low voltage function cabin, the reactive power compensation function cabin and the station transformer function cabin are all completely immersed in the insulating non-flammable liquid; and the cabins after the corresponding components are built in are spatially isolated from each other.

[0008] Furthermore, a high-voltage cable connector, a medium-voltage cable connector and a low-voltage cable connector are arranged outside the cabin; the high-voltage cable connector is connected to the functional components in the transformer function cabin; the medium-voltage cable connector is connected to the functional components in the medium-voltage function cabin; the low-voltage cable connector is connected to the functional components in the low-voltage function cabin.

[0009] Furthermore, the functional components in the two compartments are connected via a conductor passing through a partition between the two compartments, and the conductor is sealedly connected to the partition of the compartment.

[0010] Furthermore, the transformer function compartment, the medium pressure function compartment, the low pressure function compartment, the reactive power compensation function compartment and the station transformer function compartment are distributed with liquid injection ports and liquid discharge ports.

[0011] Furthermore, a transformer function cabin heat dissipation device is installed on the transformer function cabin.

[0012] Furthermore, the cabin is made of transparent insulating material.

[0013] Furthermore, the transformer function compartment, the medium pressure function compartment, the low pressure function compartment, the reactive power compensation function compartment and the station transformer function compartment are filled with insulating non-flammable liquid.

[0014] The beneficial effect of the present invention is that the fully immersed integrated underground substation disclosed by the present invention, except for the equipment in the control cabin, all other functional components are immersed in insulating non-flammable liquid, the insulating non-flammable liquid plays an insulating isolation role, and these functional components are concentrated in a cabin body divided into multiple cabins, which is equivalent to the cabin body integrating these functional components together. First, various high, medium and low voltage functional components are integrated and immersed in insulating non-flammable liquid, which solves the problem of live distance of traditional live equipment in the air and greatly saves the occupied space; high, medium and low voltage functional components no longer require the shells of various equipment, saving the cost of shell materials and production costs, reducing the shell production and shell and component assembly processes, and saving the space occupied by the shell; second, the functional components are integrated together through the cabin, which is equivalent to changing the original multiple sets of equipment into one set of equipment, further saving space; third, the insulating non-flammable liquid plays a certain fire prevention role, solving the fire prevention problem of functional components; the cabin integrates the functional components together, and there is no need to place them in multiple rooms, which correspondingly reduces the investment in fire-fighting equipment and solves the fire-fighting problem of underground substations; fourth, the cabin integrates the functional components together, and there is no need to build multiple layers of underground rooms. In addition, the reduction of fire-fighting facilities further saves the construction cost of the substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The schematic diagram of the fully immersed integrated underground substation disclosed in the present invention.

[0016] In the figure, there are a transformer function cabin 1, a medium pressure function cabin 2, a low pressure function cabin 3, a reactive power compensation function cabin 4, a station transformer function cabin 5, a control cabin 6, a high pressure cable connector 7, a medium pressure cable connector 8, a low pressure cable connector 9, a liquid filling port 10, a liquid discharge port 11, and a transformer function cabin heat dissipation device 12. DETAILED DESCRIPTION

[0017] 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 only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] The high voltage, medium voltage and low voltage mentioned in this specification refer to the voltage levels of substations, which are specifically divided according to the levels of substations. For example: for a 500KV substation, the high voltage is 500KV, the medium voltage is 220KV, and the low voltage is 66KV or 35KV; for a 220KV substation, the high voltage is 220KV, the medium voltage is 110KV, and the low voltage is 35KV or 10KV; for a 110KV substation, the high voltage is 110KV, the medium voltage is 35KV, and the low voltage is 10KV.

[0019] At present, multiple floors and rooms are usually set up underground, and transformers, medium-voltage distribution equipment, low-voltage distribution equipment, reactive power compensation equipment, station transformers and other substation equipment and corresponding control equipment are placed in different rooms, and these substation equipment are connected through conductors such as cables to form underground substations. As we all know, when placing various individual high-voltage electrical equipment in the air, it is necessary to consider the charged distance and layout distance of the charged equipment in the air, which will inevitably take up a lot of space, greatly increasing the overall space and cost of the underground substation. In addition, the transformer includes a transformer functional winding assembly for transformer function and various insulating, supporting and wrapping shells surrounding the transformer functional winding assembly, as well as high, medium and low voltage bushings; the medium voltage distribution equipment includes a medium voltage output functional component for medium voltage output and various insulating, supporting and wrapping shells surrounding the medium voltage output functional component; the low voltage distribution equipment includes a low voltage output functional component for low voltage output and various insulating, supporting and wrapping shells surrounding the low voltage output functional component; the reactive compensation equipment includes a reactive compensation functional component for reactive compensation and various insulating, supporting and wrapping shells surrounding the reactive compensation functional component; the station transformer includes a station transformer functional winding assembly for providing station power for underground substations and various insulating, supporting and wrapping shells surrounding the station transformer functional winding assembly. These transformers, medium-voltage power distribution equipment, low-voltage power distribution equipment, reactive power compensation equipment, station transformers and other power substation equipment all include core functional parts for voltage transformation and various insulation, support and wrapping shells. Not only are the various insulation, support and wrapping shells expensive, but it also takes a lot of money to install the core functional parts in the various insulation, support and wrapping shells, resulting in high cost of power substation equipment. Moreover, the various insulation, support and wrapping shells of each functional part make the size of each device larger and the space occupied by the equipment larger; high-voltage live equipment is placed in the room, and various fire-fighting equipment and fire prevention measures need to be considered, which increases the cost and takes up space.

[0020] The present invention provides a fully immersed integrated underground substation for the traditional underground substation form. Figure 1 As shown, it includes a cabin body divided into multiple cabins, and the multiple cabins of the cabin body are respectively a transformer function cabin 1, a medium pressure function cabin 2, a low pressure function cabin 3, a reactive power compensation function cabin 4, a station transformer function cabin 5 and a control cabin 6; only the transformer function cabin 1, the medium pressure function cabin 2, the low pressure function cabin 3, the reactive power compensation function cabin 4 and the station transformer function cabin 5 are filled with insulating non-flammable liquid; the functional components in the transformer function cabin 1, the medium pressure function cabin 2, the low pressure function cabin 3, the reactive power compensation function cabin 4 and the station transformer function cabin 5 are completely immersed in the insulating non-flammable liquid; the cabins after the corresponding components are built in are spatially isolated from each other.

[0021] Among them, the functional components in the transformer function cabin 1 are transformer function winding components, which play a transformer role. Compared with the traditional transformer, it does not have various insulating, supporting and wrapping shells as well as high-voltage, medium-voltage and low-voltage bushings on the outside. That is, after removing various insulating, supporting and wrapping shells as well as high-voltage, medium-voltage and low-voltage bushings and other components that do not play a transformer role from the traditional transformer, the remaining transformer core functional components are the transformer function winding components.

[0022] The functional components in the medium-voltage functional cabin 2 are medium-voltage output functional parts, which play a role in medium-voltage output. Compared with traditional medium-voltage power distribution equipment, they do not have various insulating, supporting and wrapping shells on the outside. That is, after removing various insulating, supporting and wrapping shells and other components that do not play a role in medium-voltage output from traditional medium-voltage power distribution equipment, the remaining indispensable components for medium-voltage output are medium-voltage output functional parts.

[0023] The functional components in the low-voltage functional cabin 3 are low-voltage output functional parts, which play a role in low-voltage output. Compared with traditional low-voltage power distribution equipment, they do not have various insulating, supporting and wrapping shells on the outside. That is, after removing various insulating, supporting and wrapping shells and other components that do not play a role in low-voltage output from traditional low-voltage power distribution equipment, the remaining indispensable components for low-voltage output are low-voltage output functional parts.

[0024] The functional components in the reactive compensation functional cabin 4 are reactive compensation functional parts, which play a reactive compensation role. Compared with traditional reactive compensation equipment, there are no various insulating, supporting and wrapping shells on the outside. That is, after removing various insulating, supporting and wrapping shells and other components that do not play a reactive compensation role from the traditional reactive compensation equipment, the remaining indispensable components for reactive compensation are low-voltage output functional parts.

[0025] The functional components in the station transformer function cabin 5 are station transformer function winding components, which play the role of providing station power for the underground substation. Compared with the traditional station transformer, it does not have various insulating, supporting and wrapping shells on the outside. That is, after removing various insulating, supporting and wrapping shells and other components that do not play the role of providing station power from the traditional station transformer, the remaining indispensable components for providing station power are low-voltage output functional parts.

[0026] These functional components are immersed in insulating non-flammable liquid, which plays an insulating and isolating role, and these functional components are concentrated in a cabin divided into multiple compartments, which is equivalent to integrating these functional components together in the cabin. Compared with the traditional underground substation, firstly, it avoids the problem of placing various separate high-voltage electrical equipment in the air and considering the charged distance and layout distance of the charged equipment in the air, which greatly saves the space occupied by the equipment and the space occupied and cost of the underground substation. Secondly, the components that play the role of substation no longer need various shells of various equipment, which saves the cost of shell materials and production costs, reduces the shell production and the assembly process of shell and components, and saves the space occupied by the shell; thirdly, the functional components are integrated together through the cabin, which is equivalent to changing the original multiple sets of equipment into one set of equipment, further saving space; fourthly, the insulating non-flammable liquid plays a certain fire prevention role, which solves the fire prevention problem of functional components; the cabin integrates the functional components together, and there is no need to place them in multiple rooms on multiple floors, which correspondingly reduces the investment in fire-fighting equipment and solves the fire-fighting problem of underground substations. The insulating non-flammable liquid can be used but not limited to fluorocarbon insulating coolant and mineral oil.

[0027] The compartments with corresponding components built in are spatially isolated from each other, which means that after the corresponding functional components in the transformer function compartment 1, the medium pressure function compartment 2, the low pressure function compartment 3, the reactive power compensation function compartment 4, the station transformer function compartment 5 and the control compartment 6 are connected by conductors, etc., the insulating and non-flammable liquids in the transformer function compartment 1, the medium pressure function compartment 2, the low pressure function compartment 3, the reactive power compensation function compartment 4 and the station transformer function compartment 5 will not flow between the compartments and will not leak, thereby ensuring the immersion of functional components and facilitating maintenance.

[0028] When connecting the functional components between the two compartments, a conductor is used to pass through the partition between the two compartments to connect the functional components in the two compartments, and the conductor is sealed to the partition of the compartment to prevent the insulating non-flammable liquid from passing through the gap between the partition and the conductor. The conductor can be a cable, a copper busbar, a copper rod, etc.

[0029] Computers and other operating equipment are arranged in the control cabin 6 , and operators need to operate the control cabin 6 , so there is no need to inject insulating non-flammable liquid into the control cabin 6 .

[0030] Fluorocarbon insulating coolant can be used as the insulating non-flammable liquid. Of course, other liquids that have insulating and non-flammable properties and can be used to soak the conductor can also be used.

[0031] In order to connect cables of different voltage levels, a high-voltage cable connector 7, a medium-voltage cable connector 8 and a low-voltage cable connector 9 are arranged outside the cabin; the high-voltage cable connector 7 is connected to the functional components in the transformer function cabin 1; the medium-voltage cable connector 8 is connected to the functional components in the medium-voltage function cabin 2; and the low-voltage cable connector 9 is connected to the functional components in the low-voltage function cabin 3. It should be noted that these high-voltage cable connectors 7, medium-voltage cable connectors 8 and low-voltage cable connectors 9 need to be sealed when passing through the corresponding cabin walls to prevent leakage of insulating non-flammable liquids.

[0032] In order to inject or discharge insulating non-flammable liquid into the corresponding compartment according to actual needs, the transformer function compartment 1, the medium pressure function compartment 2, the low pressure function compartment 3, the reactive power compensation function compartment 4 and the station transformer function compartment 5 are provided with injection ports 10 and discharge ports 11. With this arrangement, when a functional component in a compartment needs to be repaired, the discharge port 11 of the corresponding compartment can be opened to discharge the insulating non-flammable liquid, and after the repair is completed, the insulating non-flammable liquid can be re-injected from the injection port 10 to soak the functional component.

[0033] During operation, the functional components in each compartment generate heat. Excessive heat will affect the service life of the functional components, so better heat dissipation performance is required. Among these compartments, the transformer function winding assembly in the transformer function compartment 1 generates the most heat, so in the present invention, a transformer function compartment heat dissipation device 12 is installed on the transformer function compartment 1.

[0034] The cabin is made of a transparent insulating material, which may be tempered glass, a PVC transparent plate or an acrylic plate.

[0035] The insulating non-flammable liquid is filled in the transformer function cabin 1, the medium pressure function cabin 2, the low pressure function cabin 3, the reactive power compensation function cabin 4 and the station transformer function cabin 5, which can ensure that the functional components in the transformer function cabin 1, the medium pressure function cabin 2, the low pressure function cabin 3, the reactive power compensation function cabin 4 and the station transformer function cabin 5 are completely immersed in the insulating non-flammable liquid.

[0036] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

Claims

1. Fully immersed integrated underground substation, characterized by: The invention comprises a cabin body divided into a plurality of cabins, wherein the plurality of cabins of the cabin body are respectively a transformer function cabin (1), a medium pressure function cabin (2), a low pressure function cabin (3), a reactive power compensation function cabin (4), a station transformer function cabin (5) and a control cabin (6); a transformer function winding assembly is arranged in the transformer function cabin (1); a medium pressure output function component is arranged in the medium pressure function cabin (2); a low pressure output function component is arranged in the low pressure function cabin (3); a reactive power compensation function component is arranged in the reactive power compensation function cabin (4); a station transformer function winding assembly is arranged in the station transformer function cabin (5); and only the transformer function cabin (1), the medium pressure function cabin (2), the low pressure function cabin (3), the reactive power compensation function cabin (4) and the station transformer function cabin (5) are filled with insulating non-flammable liquid; The functional components in the transformer function cabin (1), the medium pressure function cabin (2), the low pressure function cabin (3), the reactive power compensation function cabin (4) and the station transformer function cabin (5) are all completely immersed in insulating non-flammable liquid; and the cabins with corresponding components built in are spatially isolated from each other.

2. The fully submerged integrated underground substation according to claim 1, characterized in that: A high-voltage cable connector (7), a medium-voltage cable connector (8) and a low-voltage cable connector (9) are arranged outside the cabin; the high-voltage cable connector (7) is connected to a functional component in the transformer function cabin (1); the medium-voltage cable connector (8) is connected to a functional component in the medium-voltage function cabin (2); and the low-voltage cable connector (9) is connected to a functional component in the low-voltage function cabin (3).

3. The fully submerged integrated underground substation according to claim 1, characterized in that: The functional components in the two compartments are connected via a conductor passing through a partition between the two compartments, and the conductor is sealedly connected to the partition of the compartment.

4. The fully submerged integrated underground substation according to claim 1, 2 or 3, characterized in that: The transformer function compartment (1), the medium pressure function compartment (2), the low pressure function compartment (3), the reactive power compensation function compartment (4) and the station transformer function compartment (5) are provided with liquid injection ports (10) and liquid discharge ports (11) in a distributed manner.

5. The fully submerged integrated underground substation according to claim 1, 2 or 3, characterized in that: A transformer function cabin heat dissipation device (12) is installed on the transformer function cabin (1).

6. The fully submerged integrated underground substation according to claim 1, 2 or 3, characterized in that: The cabin body is made of transparent insulating material.

7. The fully submerged integrated underground substation according to claim 1, 2 or 3, characterized in that: The transformer function compartment (1), the medium pressure function compartment (2), the low pressure function compartment (3), the reactive power compensation function compartment (4) and the station transformer function compartment (5) are filled with insulating non-flammable liquid.

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