A gas insulated open-closed transformer integrated machine suitable for an underground substation

Abstract

This utility model relates to the field of electrical equipment, and mainly discloses a gas-insulated switchgear integrated unit suitable for underground substations. It includes a gas-insulated transformer, a gas-insulated switchgear, high-voltage incoming / outgoing line points, and low-voltage incoming / outgoing line points. A cooling system is installed on the side of the gas-insulated transformer away from the gas-insulated switchgear, and a neutral point gap discharge device is connected to the other side of the gas-insulated transformer. The gas-insulated transformer used in this utility model is an SF6 insulated transformer. SF6 gas is a non-flammable gas with very stable physical and chemical properties, and its fire resistance and disaster prevention performance are relatively good. Furthermore, because the gas-insulated transformer is directly connected to the gas-insulated switchgear, auxiliary equipment such as cable heads can be eliminated, thus greatly reducing the substation's footprint. At the same time, the direct connection method results in a compact overall design, requiring only a single foundation, significantly improving the seismic resistance of the core equipment of the substation.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment, and more specifically, to a gas-insulated switchgear integrated machine suitable for underground substations. Background Technology

[0002] Underground substations are substations where the main equipment is installed underground, typically used in city centers, densely populated areas, or areas with high aesthetic requirements. By utilizing underground space, they resolve the conflict between the power demand and limited land resources in urban centers. Although construction and maintenance costs are higher, their advantages in saving space, reducing environmental impact, and improving safety are significant.

[0003] The safety performance of existing underground substations, such as fire prevention and disaster prevention, is relatively poor because the electrical components of substations are composed of small devices, and there are certain weaknesses in the connections between them.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] The purpose of this invention is to provide a gas-insulated switchgear integrated unit suitable for underground substations, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A gas-insulated switchgear integrated unit suitable for underground substations includes a gas-insulated transformer. A gas-insulated switchgear is connected to one side of the gas-insulated transformer. A high-voltage input / output point is provided at the end of the gas-insulated switchgear away from the gas-insulated transformer. A low-voltage input / output point is provided on one side of the gas-insulated transformer. A cooling system is provided on the side of the gas-insulated transformer away from the gas-insulated switchgear. A neutral point gap discharge device is also connected to one side of the gas-insulated transformer.

[0008] The gas-insulated transformer used is an SF6 insulated transformer. SF6 gas is a non-flammable gas with very stable physical and chemical properties. In contrast, epoxy resin is a flame-retardant material, but it still has a certain ignition point, so its fire prevention and disaster prevention performance is the best.

[0009] Furthermore, the high-voltage and low-voltage input / output points are directly connected by a closed busbar.

[0010] Eliminating the connecting bus and the firewalls between them further reduces costs.

[0011] Furthermore, the cooling system is arranged on one side of the long axis of the gas-insulated transformer.

[0012] The cooling system can be placed inside the civil engineering air supply duct to solve the heat dissipation problem of underground transformers.

[0013] Compared with the prior art, the present invention has the following advantages: The gas-insulated transformer used in the present invention is an SF6-insulated transformer. SF6 gas is a non-flammable gas and has very stable physical and chemical properties. In contrast, epoxy resin is a flame-retardant material, but still has a certain ignition point, so its fire prevention and disaster prevention performance is relatively good. Moreover, since the gas-insulated transformer is directly connected to the gas-insulated switchgear, auxiliary equipment such as cable heads can be eliminated, thereby greatly reducing the floor space of the substation. At the same time, the direct connection method makes the whole structure compact, requiring only the same foundation, which greatly improves the seismic performance of the core equipment of the power station. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a structural schematic diagram of a gas-insulated switchgear integrated machine suitable for underground substations according to an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the structure of a gas-insulated transformer in a gas-insulated switchgear integrated machine applicable to an underground substation according to an embodiment of the present utility model;

[0017] Figure 3 This is a schematic diagram of the neutral point gap discharge device in a gas-insulated switchgear integrated machine applicable to an underground substation according to an embodiment of the present utility model;

[0018] Figure 4 This is a structural plan view of a gas-insulated switchgear integrated machine applicable to an underground substation, according to an embodiment of the present utility model, during actual application and installation.

[0019] Figure label:

[0020] 1. Gas-insulated transformers; 2. Gas-insulated switchgear; 3. High-voltage inlet / outlet points; 4. Low-voltage inlet / outlet points; 5. Cooling systems; 6. Neutral point gap discharge equipment. Detailed Implementation

[0021] The utility model will now be further described with reference to the accompanying drawings and specific embodiments:

[0022] Please see Figure 1-4According to an embodiment of the present invention, a gas-insulated switchgear integrated machine suitable for underground substations includes a gas-insulated transformer 1, a gas-insulated switchgear 2 connected to one side of the gas-insulated transformer 1, a high-voltage input / output point 3 provided at the end of the gas-insulated switchgear 2 away from the gas-insulated transformer 1, the high-voltage input / output point 3 being used to connect the input and output of the high-voltage input / output line, and a low-voltage input / output point 4 provided on one side of the gas-insulated transformer 1, the low-voltage input / output point 4 being used to connect the input and output of the low-voltage input / output line.

[0023] The gas-insulated transformer 1 used in this application is an SF6-insulated transformer. SF6 gas is a non-flammable gas with very stable physical and chemical properties. In contrast, epoxy resin is a flame-retardant material that still has a certain ignition point, so its fire prevention and disaster prevention performance is relatively good.

[0024] Furthermore, since the gas-insulated transformer 1 is directly connected to the gas-insulated switchgear 2, auxiliary equipment such as cable heads can be eliminated, thereby greatly reducing the floor space of the substation. At the same time, the direct connection method makes the whole system compact, requiring only the same foundation, which greatly improves the seismic performance of the core equipment of the power station. It also eliminates the need for connecting busbars and firewalls between them, further saving costs.

[0025] The high-voltage inlet / outlet point 3 and the low-voltage inlet / outlet point 4 are directly connected by a closed busbar and connected by a basin-type insulator, eliminating the need for conventional bushing outlets. Therefore, there are no exposed live parts, resulting in better safety performance.

[0026] A cooling system 5 is provided on the side of the gas-insulated transformer 1 away from the gas-insulated switchgear 2. The cooling system 5 is arranged on the long axis side of the gas-insulated transformer 1 and placed in the civil engineering air supply channel to solve the heat dissipation problem of the underground transformer.

[0027] One side of the gas-insulated transformer 1 is also connected to a neutral point gap discharge device 6, which is a gas-insulated closed gap discharge device.

[0028] Because this device does not have an oil conservator, its height can be reduced by 20% compared to an oil-immersed transformer. This is very beneficial for reducing the civil engineering investment of underground substations. Moreover, it eliminates the potential danger of transformer dampness caused by untimely replacement of the breather silicone, thus improving safety and reliability.

[0029] All structures are sealed within metal components, unaffected by the external environment, possessing high strength and high corrosion resistance. Furthermore, the housings are all well grounded, ensuring safety and reliability. The neutral point gap discharge device 6 employs a fully enclosed gas-insulated ball gap discharge device, with no exposed charged parts and unaffected by the external environment.

[0030] Meanwhile, the overall modular design allows for convenient and quick on-site installation, and the cooling system is arranged on one side and placed inside the air supply duct to solve the problem of underground heat dissipation.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas-insulated switchgear integrated unit suitable for underground substations, characterized in that, The device includes a gas-insulated transformer (1), a gas-insulated switchgear (2) connected to one side of the gas-insulated transformer (1), a high-voltage input / output point (3) provided at the end of the gas-insulated switchgear (2) away from the gas-insulated transformer (1), a low-voltage input / output point (4) provided on one side of the gas-insulated transformer (1), a cooling system (5) provided on the side of the gas-insulated transformer (1) away from the gas-insulated switchgear (2), and a neutral point gap discharge device (6) connected to one side of the gas-insulated transformer (1).

2. The gas-insulated switchgear integrated unit suitable for underground substations according to claim 1, characterized in that, The high-voltage inlet / outlet point (3) and the low-voltage inlet / outlet point (4) are directly connected by a closed busbar.

3. The gas-insulated switchgear integrated unit suitable for underground substations according to claim 2, characterized in that, The cooling system (5) is located on one side of the long axis of the gas-insulated transformer (1).

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