Medium and low voltage common box GIL for transformer substation
By designing medium and low voltage common box GIL in the substation, using radial and angular corrugated pipe compensation and overhead laying, the problem of land occupation and thermal deformation of GIL equipment in high altitude and low temperature areas is solved, and space saving and equipment life are achieved.
Patent Information
- Application Number
- CN202421938627.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-12
AI Technical Summary
In substations, GIL equipment is complexly installed in high altitude and low temperature areas, resulting in increased footprint and increased cost, and long line casings are prone to thermal deformation and have a short service life.
A medium and low voltage common box GIL is designed to compensate by installing radial and angular corrugated pipes at the connection between GIL and GIS, adapting to complex terrain and using overhead laying of the main pipes to reduce land occupation and cost while improving the service life of the equipment.
It effectively reduces the substation's land space and production and procurement costs, improves the flexibility of equipment layout and service life, and reduces the degree of thermal deformation of long-circuit casing.
Smart Images
Figure CN223066641U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medium and low voltage power transmission, and more specifically, to a medium and low voltage common box GIL for a substation. Background Art
[0002] The rigid gas insulated transmission line (GIL) is a high-voltage and large-current power transmission device that uses gas insulation and has the outer shell and conductor arranged coaxially. At present, the transmission power of GIL can reach 4GW, with strong power transmission ability, and its average service life is more than 50 years. Compared with traditional overhead lines or power transmission cables, it has the advantages of large capacity, high voltage, long-distance power transmission lines with high reliability, long service life, strong transmission ability, not being affected by environmental factors such as bad weather and special terrain, being able to effectively utilize space resources, reducing electromagnetic interference, increasing the current-carrying capacity, low failure rate, and convenient maintenance, which is beneficial to reducing the number of power transmission circuits. Adopting a compact enclosed structure, it occupies less land than overhead lines. The layout method is flexible, which can simplify the system wiring and improve the power supply reliability of the entire system. It is the development trend of the current power transmission system.
[0003] However, GIL often encounters the following many situations in the engineering design of substation reconstruction, expansion, and energy storage projects:
[0004] 1) Due to the complex installation terrain in high altitude and low temperature areas, there are many corners, and adding current branches, installing test equipment, or introducing other auxiliary detection units requires adding interfaces. The power transmission line is branched from one circuit to two circuits, increasing the equipment floor area and cost;
[0005] 2) The long-line bushing is prone to large thermal deformation, resulting in a short service life of the device.
[0006] Therefore, it is necessary to design a medium and low voltage common box GIL for a substation, which can adapt to high altitude and low temperature areas with complex terrain, help reduce the occupied space, reduce the production and procurement costs, improve the flexibility of line layout, and increase the service life of the device. Summary of the Utility Model
[0007] The utility model provides a medium and low voltage common box GIL for a substation to overcome the problems raised in the above background.
[0008] To solve the above technical problems, the technical solution of the utility model is as follows:
[0009] A medium and low voltage coaxial GIL pipeline for a substation, comprising a GIL pipeline, a transformer, a GIS pipeline and a switch control cabinet that form an electrical circuit with the GIL pipeline. The upper part of the transformer is connected to a disconnector through a low voltage bushing. A pot insulator is provided on the disconnector, and one end of the disconnector is connected to the GIL pipeline through the pot insulator; the inlet and outlet of the GIS pipeline and the switch control cabinet are all connected to the GIL pipeline through pot insulators, where,
[0010] A radial bellows is installed on the straight section unit where the GIL pipeline is connected to the GIS pipeline for radial compensation; an angular bellows is installed on the corner unit where the GIL pipeline is connected to the GIS pipeline for angular compensation.
[0011] Preferably, the number of sets of the transformer, the GIS pipeline and the switch control cabinet is the same, and multiple matching interfaces are reserved on the GIL pipeline.
[0012] Preferably, both the radial bellows and the angular bellows are single-wall bellows.
[0013] Preferably, at least multiple disconnectors are provided above the transformer. One end of multiple disconnectors is connected to the transformer through a low voltage bushing; the other end of multiple disconnectors is connected to the GIL pipeline through pot insulators.
[0014] Preferably, the main pipe of the GIL pipeline is laid overhead.
[0015] Preferably, the applicable voltage range of the medium and low voltage coaxial GIL is 10kV - 35kV.
[0016] Compared with the prior art, the beneficial effects of the technical solution of the present utility model are:
[0017] The present utility model provides a medium and low voltage coaxial GIL for a substation, which is applicable to high altitude and low temperature regions with complex environments, and the applicable range is 10kV - 35kV. Multiple sets of transformers can share a coaxial GIL, which can compress the scale of the substation, reduce the number of switchgear, the main pipe of the GIL is laid overhead, effectively reducing the floor area and reducing costs at the same time; the GIS pipeline is connected to the GIL through two pot insulators at the inlet and outlet. After the GIL is connected to the inlet of the GIS pipeline, the three-phase phase sequence can be adjusted when exiting from the outlet of the GIS pipeline, and it can be docked with overhead lines, GIS pipeline equipment, transformer equipment and cables; radial bellows and angular bellows are respectively used at the straight section unit and the corner unit of the GIL connected to the GIS pipeline for radial compensation and deflection angle compensation, to absorb the foundation error and installation error, and at the same time reduce the degree of easy thermal deformation at the connection of the long line bushing, improving the service life of the device. Description of the Drawings
[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0019] Figure 1 Structural schematic diagram of an embodiment of the present invention;
[0020] Figure 2 Structural schematic diagram of the connection between GIL and transformer and disconnector of the present invention;
[0021] Figure 3 Structural schematic diagram of the connection between GIL and GIS of the present invention;
[0022] Figure 4 Structural schematic diagram of the connection between GIL and switchgear of the present invention.
[0023] Explanation of the markings in the figure: 1. Transformer; 2. Disconnector; 3. GIL; 4. GIS; 5. Switch control cabinet; 6. Radial bellows; 7. Angular bellows; 8. Low-voltage bushing. Detailed implementation manners
[0024] To better understand the purpose, structure and function of the present invention, the following will further describe the technical solutions of the present invention in detail with reference to the drawings and specific preferred embodiments.
[0025] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by terms such as "left side", "right side", "upper part", "lower part", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not represent the importance of the components, so they cannot be understood as limitations to the present invention. The specific dimensions adopted in the embodiments are only for illustrating the technical solutions by way of example, and do not limit the protection scope of the present invention. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.
[0026] Unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", "fixing" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0027] GIS (Gas Insulated Switchgear), a gas-insulated combined electrical equipment, is composed of a circuit breaker, disconnector, earthing switch, instrument transformer, lightning arrester, busbar, connecting piece, outgoing terminal, etc. It is filled with SF6 insulating gas inside and is applied in high-voltage and extra-high-voltage equipment to achieve a highly compact and miniaturized design.
[0028] GIL (Gas Insulated Transmission Lines) rigid gas-insulated transmission line is a high-voltage and large-current power transmission equipment with gas insulation and coaxial arrangement of the outer shell and conductor. It is filled with SF6 insulating gas inside to achieve a highly compact and miniaturized design.
[0029] The technical solution of the present utility model is applicable to voltage levels of 10 kV - 35 kV.
[0030] The specific embodiments of the present utility model will be described below.
[0031] Embodiment 1:
[0032] Please refer to Figures 1-4 , a medium and low voltage coaxial GIL for a substation, including a GIL pipeline 3 and a transformer 1, a GIS pipeline 4, and a switch control cabinet 5 that form a circuit with the GIL pipeline 3. The GIL pipeline 3 is composed of several straight section units, corner units, etc., and is used to connect the transformer 1, the GIS pipeline 4, and the switch control cabinet 5. The upper part of the transformer 1 is connected to the disconnector 2 through a low-voltage bushing 8. A pot-type insulator is provided on the disconnector 2, and one end of the disconnector 2 is connected to the GIL pipeline 3 through the pot-type insulator; the number of disconnectors 2 depends on the number of circuits of the GIL. In some cases, multiple line branches need to be added, and the connection of multiple different branches to the transformer is all realized through the disconnector 2.
[0033] The inlet and outlet of the GIS pipeline 4 and the switch control cabinet 5 are all connected to the GIL pipeline 3 through pot-type insulators. A radial bellows 6 is installed on the straight section unit where the GIL pipeline 3 is connected to the GIS pipeline 4 for radial compensation; an angular bellows 7 is installed on the corner unit where the GIL pipeline 3 is connected to the GIS pipeline 4 for angular compensation; after the GIL pipeline 3 is connected to the inlet of the GIS pipeline 4, the three-phase phase sequence can be adjusted when leaving from the outlet of the GIS pipeline 4.
[0034] In some embodiments, the numbers of sets corresponding to the transformer 1, the GIS pipeline 4, and the switch control cabinet 5 are the same, and multiple matching interfaces are reserved on the GIL pipeline 3.
[0035] In some embodiments, both the radial bellows 6 and the angular bellows 7 are single-wall bellows, and the number of single waves of the radial bellows 6 and the angular bellows 7 is a multiple of 2; the radial bellows 6 is used to adjust the foundation error and installation error to ensure the stability during the linear connection of the pipeline; the angular bellows 7 is used for compensating the angular deflection caused by the thermal expansion and contraction of the line to improve the service life of the device; the number and arrangement order of the combination of the radial bellows 6 and the angular bellows 7 in the GIL pipeline 3 are determined according to the terrain of the transmission line laying or the need to add ports.
[0036] In some embodiments, at least multiple disconnectors 2 are arranged above the transformer 1. One ends of the multiple disconnectors 2 are all connected to the transformer 1 through low-voltage bushings 8; the other ends of the multiple disconnectors 2 are all connected to the GIL pipeline 3 through pot-type insulators. In some specific application scenarios, when additional line branches are needed, multiple disconnectors 2 are required for the disconnection between different lines.
[0037] In some embodiments, the main pipe of the GIL pipeline 3 is laid overhead. In some high-altitude and low-temperature areas, such as Tibet, the terrain is complex and changeable with many mountains. Due to the high cost of excavating the permafrost layer in some high-altitude areas, it is difficult to carry out the conventional laying method of the main pipe of the GIL pipeline 3, and it is necessary to raise it to bypass some obstacles. While facilitating the laying, it can effectively reduce the floor area and also reduce costs and increase efficiency.
[0038] In some embodiments, the applicable voltage range of the medium- and low-voltage common-box GIL is 10 kV - 35 kV. In the medium- and low-voltage common-box GIL of the present utility model, multiple sets of transformer 1 outflows share one GIL, which is applicable to medium- and low-voltage levels. With the reconstruction of substations and the increase in energy storage projects, the demand for GIL in the above fields is also gradually increasing; the outflows of multiple transformers 1 share one GIL, which can compress the scale of the substation and reduce the number of switchgears; save costs, save floor area and effectively reduce the civil engineering cost.
[0039] The specific connection steps of the present utility model are as follows: The GIL pipeline 3 is first connected to the transformer 1 and the disconnector 2. The other end of the GIL pipeline 3 is connected to the inlet of the GIS pipeline 4 and is connected to the switch control cabinet 5 from the outlet of the GIS pipeline 4. According to the actual requirements of the substation, multiple disconnectors 2 are added on the top of the transformer 1, and one disconnector 2 controls one line branch. At the same time, multiple transformers 1 share a GIL loop; this application is applicable to working conditions in high-altitude and low-temperature areas, can effectively optimize the floor area, save production and procurement costs, and at the same time, a radial bellows 6 is installed on the straight section unit where the GIL pipeline 3 is connected to the GIS pipeline 4 for radial compensation; an angular bellows 7 is installed on the corner unit where the GIL pipeline 3 is connected to the GIS pipeline 4 for angular compensation, which can effectively absorb the foundation error and installation error, and at the same time reduce the degree of easy thermal deformation at the connection of the long-line bushing, and improve the service life of the device.
[0040] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limiting the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.
Claims
1. A medium and low voltage coaxial GIL for a substation, comprising a GIL pipeline (3), a transformer (1), a GIS pipeline (4), and a switch control cabinet (5) that form an electrical circuit with the GIL pipeline (3), characterized in that: The upper part of the transformer (1) is connected to the disconnector (2) through the low-voltage bushing (8). A pot-type insulator is provided on the disconnector (2), and one end of the disconnector (2) is connected to the GIL pipeline (3) through the pot-type insulator; the inlet port, outlet port of the GIS pipeline (4), and the switch control cabinet (5) are all connected to the GIL pipeline (3) through pot-type insulators. Among them, A radial bellows (6) is installed on the straight section unit where the GIL pipeline (3) is connected to the GIS pipeline (4) for radial compensation; an angular bellows (7) is installed on the corner unit where the GIL pipeline (3) is connected to the GIS pipeline (4) for angular compensation.
2. The medium and low voltage coaxial GIL for a substation according to claim 1, wherein The corresponding numbers of sets of the transformer (1), GIS pipeline (4), and switch control cabinet (5) are the same, and multiple matching interfaces are reserved on the GIL pipeline (3).
3. The medium and low voltage coaxial GIL for a substation according to claim 1, characterized in that, Both the radial bellows (6) and the angular bellows (7) are single-wall bellows.
4. The medium and low voltage coaxial GIL for a substation according to claim 1, characterized in that, At least multiple disconnectors (2) are provided above the transformer (1). One ends of the multiple disconnectors (2) are all connected to the transformer (1) through the low-voltage bushing (8); the other ends of the multiple disconnectors (2) are all connected to the GIL pipeline (3) through pot-type insulators.
5. The medium and low voltage coaxial GIL for a substation according to claim 1, characterized in that, The main pipe of the GIL (3) is laid overhead.
6. The medium and low voltage coaxial GIL for a substation according to claim 1, characterized in that, The applicable voltage range of the medium and low voltage common box GIL is 10 kV - 35 kV.