Substation for 500kV capacity-increasing expansion main transformer
By expanding the main transformer beyond its original scale within the original substation and utilizing the existing equipment layout, the capacity of the 500kV substation was increased and expanded, solving the problems of scarce land resources and long construction periods, and achieving land conservation and improved power supply capacity.
Patent Information
- Application Number
- CN202421305915.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-06-07
AI Technical Summary
Given the scarcity of land resources and the long construction period, how can we expand the capacity of the 500kV substation based on the existing substation and reduce land occupation and construction costs?
By expanding the main transformer beyond its original scale within the original substation, utilizing the existing 500kV busbars and bays, combining them with the newly built 220kV outgoing lines, and adopting a specific arrangement of 500kV and 220kV outdoor distribution equipment, including the connection between the main transformer and the incoming GIS, and setting outgoing line bays and reactive power compensation controllers, the station capacity expansion was achieved.
Significantly save land resources and construction costs, double the power supply capacity, and improve the scale benefits and power supply reliability of the power grid.
Smart Images
Figure CN223462598U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to substation design technical field especially a substation for 500kV capacity expansion extension main transformer. BACKGROUND
[0002] With the regional economic and social development, the new load of a certain area is up to 1.5 million kW, and the phenomenon of power shortage appears, and it is urgent to add 500kV substation capacity or 220kV power supply to increase the power supply capacity. Because the power supply of the area is mainly hydropower and the planned construction power supply is less, therefore, the load growth is met by adding 500kV substation capacity. In the past such engineering design, there are two schemes.
[0003] Scheme one is: a new 500kV substation is built, 500kV main transformer equipment is constructed, and 220kV interval is constructed at the same time to meet the power load access.
[0004] The problem of scheme one is: the land resource is relatively scarce, the ecological red line and the basic farmland are widely distributed, the new 500kV substation faces a series of problems such as land acquisition difficulty, long construction period and high cost.
[0005] Scheme two is: a main transformer is expanded in the original station and outside the station, and 220kV outgoing line interval is expanded outside the station to meet the power load access.
[0006] The problem of scheme two is: land acquisition outside the station is still needed, and procedures such as land pre-examination and site planning are needed, and a series of problems such as long construction period and high cost are faced.
[0007] Therefore, the construction difficulty of 500kV power transmission and transformation project is long, and the expansion outside the station also needs procedures such as land acquisition, once the housing demolition or environmental sensitive area is involved, the coordination process is complicated, and the construction period is generally difficult to control. The station inside super scale expansion mode reduces the engineering construction difficulty, and can ensure the construction progress. UTILITY MODEL CONTENTS
[0008] The utility model solves the technical problem to provide a kind of substation for 500kV capacity expansion extension main transformer, and the ground is not expanded on the basis of original substation, realizes 500kv substation capacity expansion, reduces land occupation, saves land resource use.
[0009] The technical scheme that the utility model solves its technical problem adopts is:
[0010] The utility model relates to a kind of substation for 500kV capacity expansion extension main transformer, including 500kV outdoor distribution equipment, 220kV outdoor distribution equipment and 35kV outdoor distribution equipment, main transformer A, main transformer B and main transformer C are provided on the 35kV outdoor distribution equipment, the 500kV outdoor distribution equipment is connected with main transformer A, B and, C by 500kV main transformer incoming line HGIS, 220kV main transformer incoming line GIS one, 220kV main transformer incoming line GIS two and 220kV main transformer incoming line GIS three are installed on the 220kV outdoor distribution equipment, 220kV main transformer incoming line GIS one, two, three are connected with main transformer A, B, C respectively, 220kV main transformer incoming line GIS two is connected with main transformer B5, 220kV main transformer incoming line GIS three is connected with main transformer C.
[0011] The 220kV outdoor distribution equipment is connected with outgoing line interval, the 500kV outdoor distribution equipment is provided with relay room, and the 35kV outdoor distribution equipment is provided with reactive power compensation controller.
[0012] The outgoing line interval includes one 500kV main transformer incoming line interval, four 220kV outgoing line intervals and one 220kV main transformer incoming line interval.
[0013] The 35kV outdoor distribution equipment is provided with alternating current station power screen room and main control building beside it.
[0014] The number of main transformer A, main transformer B and main transformer C is three.
[0015] The 500kV outdoor distribution equipment is 3 / 2 circuit breaker connection outdoor AIS equipment, and adopts suspension busbar medium arrangement.
[0016] The 220kV outdoor distribution equipment is outdoor GIS equipment, and adopts double busbar double section connection arrangement.
[0017] The utility model has the advantages that:
[0018] 1. The existing 500kV busbar and interval are shared by super-scale extension main transformer in station and original main transformer, and 500kV line does not need to be newly built, 220kV outgoing line of super-scale extension is shared by existing 220kV busbar, a large amount of land resources and construction cost are saved, and social resources can be significantly reduced.
[0019] 2. The piece of power grid increases 1500MVA / 500kV main transformer capacity by super-scale extension in station, so that the maximum power supply capacity of the piece of power grid is increased from 1500MW to 3000MW, the maximum power supply capacity is increased by 2 times, the scale benefit of power grid is fully played, and power supply reliability is higher. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 is a schematic diagram of the connecting structure of the utility model;
[0021] As shown in the figure: 1-500kV outdoor distribution equipment; 2-220kV outdoor distribution equipment; 3-35kV outdoor distribution equipment; 4-main transformer A; 5-main transformer B; 6-main transformer C; 7-500kV main transformer line HGIS; 8-220kV main transformer line GIS one; 9-220kV main transformer line GIS two; 10-220kV main transformer line GIS three; 11-outlet interval; 12-relay room; 13-35kV reactive power compensation controller; 14-AC station power screen room; 15-main control building. DETAILED DESCRIPTION
[0022] The utility model is further illustrated below in combination with the drawings and examples.
[0023] As Figure 1 shown, a kind of for 500kV capacity expansion expansion main transformer substation, including 500kV outdoor distribution equipment 1, 220kV outdoor distribution equipment 2 and 35kV outdoor distribution equipment 3, the 35kV outdoor distribution equipment 3 is provided with main transformer A 4, main transformer B 5 and main transformer C 6, the 500kV outdoor distribution equipment 1 is connected with main transformer A, B and C by 500kV main transformer line HGIS 7, the 220kV outdoor distribution equipment 2 is installed with 220kV main transformer line GIS one 8, 220kV main transformer line GIS two 9 and 220kV main transformer line GIS three 10, the 220kV main transformer line GIS one, two, three are connected with main transformer A, B, C, the 220kV main transformer line GIS two 9 is connected with main transformer B 5, the 220kV main transformer line GIS three 10 is connected with main transformer C 6.
[0024] The 220kV outdoor distribution equipment 2 is connected with outlet interval 11, the 500kV outdoor distribution equipment 1 is provided with relay room 12, the 35kV outdoor distribution equipment 3 is provided with 35kV reactive power compensation controller 13.
[0025] The outlet interval 11 includes 1 500kV main transformer line interval, 4 220kV outlet intervals and newly builds 1 220kV main transformer line interval.
[0026] The 35kV outdoor distribution equipment 3 is provided with AC station power screen room 14 and main control building 15 beside.
[0027] The number of main transformer A 4, main transformer B 5 and main transformer C 6 is three.
[0028] The 500kV outdoor power distribution equipment 1 is an outdoor AIS equipment with 3 / 2 circuit breaker connection, adopting a suspension busbar medium arrangement.
[0029] The 220kV outdoor power distribution equipment 2 is an outdoor GIS equipment, adopting a double busbar double section connection arrangement.
[0030] Through the super-scale expansion of the station, the existing 500kV busbar and interval of the original main transformer are shared by the super-scale expanded main transformer, and no new 500kV line needs to be built, the 220kV outgoing line of the super-scale expansion is shared by the existing 220kV busbar, a large amount of land resources and construction costs are saved, and the occupation of social resources can be significantly reduced.
[0031] Through the super-scale expansion of the station, the piece of power grid increases 1500MVA / 500kV main transformer capacity, so that the maximum power supply capacity of the piece of power grid is increased from 1500MW to 3000MW, the maximum power supply capacity is increased by 2 times, the scale benefit of the power grid is fully played, and the power supply reliability is high.
[0032] The main transformers A, B and C are a main transformer A4, a main transformer B5 and a main transformer C6 respectively.
[0033] The 220kV main transformer incoming line GIS one, two and three are a 220kV main transformer incoming line GIS one 8, a 220kV main transformer incoming line GIS two 9 and a 220kV main transformer incoming line GIS three 10 respectively.
[0034] The implementation list is as follows:
[0035] An example of a certain 500kV substation, the planned main transformer capacity is 3×750MVA, a single-phase no-load voltage regulating transformer group is adopted, and 2×750MVA has been built; 500kV planned outgoing line is 6, a half circuit breaker connection type is adopted, 6 lines 2 transformers form 4 complete strings, and now all 2 main transformers, 4 outgoing lines, 2 complete strings and 2 incomplete strings exist. 220kV planned outgoing line is 14, existing outgoing line is 12, double busbar double section connection is adopted.
[0036] The 500kV outdoor power distribution equipment 1 is arranged on the south side of the station area, the 220kV outdoor power distribution equipment is arranged on the north side of the station area, the main transformer and the 35kV outdoor power distribution equipment are arranged in the middle of the station area, the station front area is arranged on the west side of the station area, and the entrance road is connected from the west side of the station area.
[0037] The main transformer is consistent with the previous selection, a single-phase self-coupling no-load voltage regulating transformer is adopted, the 35kV outdoor power distribution equipment adopts an outdoor AIS equipment, supports a pipe busbar medium arrangement, a total road circuit breaker is arranged, and the 35kV outdoor power distribution equipment and the main transformer are arranged between the 500kV outdoor power distribution equipment 1 and the 220kV outdoor power distribution equipment 2.
[0038] The 500kV outdoor distribution equipment 1 was designed for 3 / 2 circuit breaker wiring, using outdoor AIS equipment with a medium-sized flexible conductor layout. The incoming line bay of the main transformer C6 was expanded, and the IIM busbar was not connected in series. A new circuit breaker was installed. The main transformer incoming line bay at the 500kV outdoor distribution equipment 1 site was small, making it impossible to arrange the AIS equipment. HGIS equipment was used in the initial planning, so it was adopted in this phase. The 500kV lightning arrester was placed close to the main transformer and used a detachable bracket.
[0039] The 220kV outdoor distribution equipment 2 adopts double-busbar double-section wiring, and the distribution device adopts outdoor GIS equipment. The main transformer incoming line interval is expanded. By optimizing the reactive power configuration of this period, 2 groups of reactive power are reduced compared with the original plan. Therefore, expansion space is reserved on the east side. Four 220kV outgoing lines are expanded on the east side of the main transformer and 35kV outdoor distribution equipment 3 site. The type of expanded distribution device is consistent with the previous period, and outdoor GIS is still used, which is arranged in an "L" shape with the previously built GIS.
[0040] A new relay room was added during this phase, housing the newly added 220kV line protection panel, 220kV fault recorder, 220kV measurement and control panel, 220kV watt-hour meter panel, DC power distribution panel, clock expansion device panel, protection information management substation collection panel, main transformer measurement and control panel, utility measurement and control panel, main transformer protection panel, 35kV protection and measurement control panel, main transformer and 35kV watt-hour meter panels, and main transformer fault recorder. The new relay room was located in the original high-voltage reactor area.
[0041] The two existing 750MVA transformers in the station were replaced with 1000MVA ones, and the 750MVA main transformers were used in other newly built 500kV substations, avoiding the idleness of the 750MVA main transformers and indirectly saving investment in other substations.
[0042] At the same time, the 220kV busbar and outgoing line bay are expanded, and the current transformer of the original 220kV main transformer incoming line bay GIS does not meet the rated current and needs to be modified.
[0043] By rationally utilizing the overall layout, the existing two 750MVA transformers were replaced with 1000MVA transformers, a third main transformer (1000MVA), reactive power compensation, a 500kV main transformer incoming line bay and four 220kV outgoing line bays were added to the station, one 220kV main transformer incoming line bay was expanded, two 220kV main transformer incoming line bays were renovated, and the 220kV busbar was operated in sections.
[0044] Under the premise of meeting power supply needs and technical feasibility, the potential of power grid projects in terms of resource conservation, construction complexity, and technical and capital benefits should be fully explored. Compared with the construction model of building a new 500kV substation and expanding outside the station, the super-scale expansion within the station has obvious advantages.
[0045] In order to make full use of the transformer step-down capacity, the short-circuit impedance percentage of two transformers running in parallel should be consistent, therefore, the main transformer relocation in the station is required in this project. For the safe and stable operation of the power grid, at least two main transformers should be running in the station during the construction process, and the following scheme is adopted: first, expand the easternmost main transformer C6, then replace the main transformer B5 and the main transformer A1 in turn; when the main transformer C6 is installed and tested in the incoming line interval equipment, the 500kV II bus needs to be powered off, at this time the 500kV adopts single bus operation; due to the need to connect the new bus and the expansion of the 220kV main transformer incoming line interval, the same frequency and phase withstand voltage test is adopted to avoid the simultaneous power off of the bus.
[0046] 1) The implementation of 500kV station internal super-scale expansion can significantly enhance the power supply capacity of the area, meet the needs of large load growth, have comparable technical performance with newly built 500kV substations and station external expansion, and has obvious economic advantages. In the areas with similar construction cycle requirements, large-scale power load density, and tight line channel resources, it has strong application prospects.
[0047] 2) Special attention should be paid to site conditions, station internal general layout, original equipment calibration, noise level, fire-fighting facilities, construction organization, commissioning test, etc. when adopting the 500kV station internal super-scale expansion mode, in order to ensure that the scheme can be implemented.
[0048] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A substation for 500kV capacity expansion extension main transformer, comprising 500kV outdoor power distribution equipment (1), 220kV outdoor power distribution equipment (2) and 35kV outdoor power distribution equipment (3), characterized in that: The 35kV outdoor power distribution equipment (3) is provided with main transformer A (4), main transformer B (5) and main transformer C (6), the 500kV outdoor power distribution equipment (1) is connected with main transformer A, B and C through 500kV main transformer incoming line HGIS (7), the 220kV outdoor power distribution equipment (2) is installed with 220kV main transformer incoming line GIS one (8), 220kV main transformer incoming line GIS two (9) and 220kV main transformer incoming line GIS three (10), the 220kV main transformer incoming line GIS one, two and three are connected with main transformer A, B and C respectively, the 220kV main transformer incoming line GIS two (9) is connected with main transformer B (5), and the 220kV main transformer incoming line GIS three (10) is connected with main transformer C (6).
2. The substation for the 500 kV capacity expansion extension main transformer according to claim 1, characterized in that: The 220kV outdoor power distribution equipment (2) is connected with outgoing line interval (11), the 500kV outdoor power distribution equipment (1) is provided with relay room (12), and the 35kV outdoor power distribution equipment (3) is provided with reactive power compensation controller (13).
3. The substation for the 500 kV capacity expansion extension main transformer according to claim 2, characterized in that: The outgoing line interval (11) comprises one 500kV main transformer incoming line interval, four 220kV outgoing line intervals and one 220kV main transformer incoming line interval.
4. The substation for the 500 kV capacity expansion extension main transformer of claim 1, wherein: The 35kV outdoor power distribution equipment (3) is provided with alternating current station power screen room (14) and main control building (15) beside.
5. The substation for the 500 kV capacity expansion extension main transformer of claim 1, wherein: The number of main transformer A (4), main transformer B (5) and main transformer C (6) is three.
6. The substation for the 500 kV capacity expansion extension main transformer of claim 1, wherein: The 500kV outdoor power distribution equipment (1) is 3 / 2 breaker connection outdoor AIS equipment, and adopts suspension pipe busbar medium arrangement.
7. The substation for the 500 kV capacity expansion extension main transformer of claim 1, wherein: The 220kV outdoor power distribution equipment (2) is outdoor GIS equipment, and adopts double busbar double section connection arrangement.