CN221328447U - Electrical main wiring structure suitable for three-main-transformer high-reactance large-scale offshore booster station - Google Patents
Electrical main wiring structure suitable for three-main-transformer high-reactance large-scale offshore booster station Download PDFInfo
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Abstract
The utility model discloses an electric main wiring structure suitable for a three-main transformer high-reactance large-scale offshore booster station, which comprises the following components: three groups of main transformer units, three groups of 220kV power distribution device units, three groups of high-voltage power distribution device units, three groups of 66kV power distribution device units, two groups of 10kV power distribution device and station transformer units, and one group of 400V power distribution device and diesel generator units; the main transformer is a three-winding transformer, the high-voltage side of the main transformer is connected with a 220kV power distribution device unit, the medium-voltage side of the main transformer is connected with a 66kV power distribution device unit, and the low-voltage side of the main transformer is connected with a 10kV power distribution device and a station transformer unit; the utility model simplifies the equipment of the offshore booster station, simplifies the structure of the booster station, effectively reduces the construction cost of the booster station, improves the investment benefit of the offshore wind power engineering and has obvious comprehensive benefit while meeting the sending-out requirement of the offshore wind power plant.
Description
Technical Field
The utility model relates to an electric main wiring suitable for a large-scale offshore booster station with high reactance of three main transformers, which is suitable for the field of offshore wind power generation.
Background
The offshore wind power has the advantages of rich wind power resources, stable power generation, advanced technology and the like. In recent years, with the continuous progress of the related technology of offshore wind power, it is necessary to explore a solution of an offshore booster station with larger capacity and stronger economic competitiveness, and the solution has very important practical significance for the development of deep open sea wind power.
Offshore wind power transmission lines are typically submarine cables, and long-route submarine cables will generate larger charging power when in operation, which will lead to increased line loss and occupied line capacity. At present, a technical scheme of configuring a high-voltage reactor at an offshore booster station can be adopted, reactive power of a submarine cable is absorbed through parallel connection of the high-voltage reactor, and the utilization rate of the submarine cable capacity can be improved.
Aiming at the offshore wind turbine generator with larger capacity and the offshore wind farm site with larger regulation model and larger offshore distance, the existing engineering implementation of the single main transformer or the double main transformers of the offshore booster station can not meet the output requirement of the power generation energy of the wind farm. Therefore, the electric main wiring scheme which can simplify the equipment of the offshore booster station, simplify the structure of the booster station and reduce the size and weight of the booster station is explored to be beneficial to improving the investment benefit of offshore wind power engineering and enhancing the market competitiveness of offshore wind power while meeting the delivery requirements of the offshore wind power plant with larger regulation and larger offshore distance.
Disclosure of utility model
The utility model aims to solve the problems in the prior art, and provides an electric main wiring structure suitable for a large-scale offshore wind power station with high reactance of three main transformers, which can simplify offshore wind power station equipment, simplify the structure of the booster station, reduce the size and weight of the booster station, be beneficial to improving the investment benefit of offshore wind power engineering and strengthen the market competitiveness of offshore wind power while meeting the delivery requirement of an offshore wind power station.
Electric main wiring structure suitable for three main transformer area high resistant large-scale marine booster station, its characterized in that: the electrical main wiring includes: three groups of main transformer units, three groups of 220kV power distribution device units, three groups of high-voltage power distribution device units, three groups of 66kV power distribution device units, two groups of 10kV power distribution device and station transformer units, and one group of 400V power distribution device and diesel generator units; the structures of a first group of main transformer units and a second group of main transformer units in the three groups of main transformer units are completely consistent, the main transformer comprises a main transformer, the main transformer is a three-winding transformer, the high-voltage side of the main transformer is connected with a 220kV power distribution device unit, the medium-voltage side of the main transformer is connected with a 66kV power distribution device unit, and the low-voltage side of the main transformer is connected with a 10kV power distribution device and a station transformer unit; and a third group of main transformer units in the three groups of main transformer units comprises a transformer with a balance winding, wherein the high-voltage side of the transformer is connected with a 220kV power distribution unit, the medium-voltage side of the transformer is connected with a 66kV power distribution unit, and the low-voltage side winding is used as the balance winding and is not externally led out of a wiring terminal.
Further, the three groups of 220kV power distribution device units are completely consistent in structure, the 220kV power distribution device units are 220kV GIS, a line transformer group with one inlet and one outlet is adopted for wiring, the inlet side is connected with the high-voltage side of the main transformer, the outlet side is connected with a 220kV submarine cable, and a high-resistance inlet branch is arranged on the outlet side.
The three groups of high-voltage resistors have completely identical structures and all comprise a high-voltage resistor which is 220kV, three-phase and copper coil parallel high-voltage resistor.
The three groups of 66kV power distribution device units are completely identical in structure and all adopt single bus wiring. The 66kV distribution device unit comprises 4 fan inlet wire intervals, 1 main transformer outlet wire interval and 1 group of bus equipment.
The two groups of 10kV power distribution devices and the station transformer unit are completely identical in structure, the 10kV power distribution devices are 10kV switch cabinets, and single bus wiring is adopted. The 10kV power distribution device and the station transformer unit comprise 1 main transformer wire inlet interval, 1 station transformer wire outlet interval and 1 group of bus equipment; the station is changed into a dry-type cabinet transformer.
The 400V power distribution device and diesel generator unit comprises 1 diesel generator and 400V power distribution buses, wherein the first section 400V power distribution buses are connected with a first 10kV power distribution device and station transformer unit; the second section 400V distribution bus is connected with a second 10kV distribution device and a station transformer unit; the third section 400V distribution bus is connected with a diesel generator; an annular wiring mode is adopted among the three sections of 400V distribution buses.
1. The electric main wiring structure suitable for the large-scale offshore booster station with the high reactance of the three main transformers disclosed by the utility model balances the charging power generated in the running process of the sent-out submarine cable by configuring the high reactance, improves the conveying efficiency of the submarine cable, and is suitable for offshore wind power engineering with a longer offshore distance.
2. In the electric main wiring structure suitable for the three-main transformer high-reactance large-scale offshore booster station, the 220kV power distribution device adopts the line transformer group for wiring, and the wiring mode has the advantages of simple structure, small investment, occupied area, good economic benefit and the like.
3. In the electric main wiring structure suitable for the three-main-transformer high-reactance large-scale marine booster station, two of the three main transformers adopt three-winding transformers and one adopts a transformer with a balance winding, so that the compact arrangement of the booster station is facilitated and the construction cost of a platform is reduced compared with the case that three double-winding transformers are adopted. Compared with the scheme that after a double-winding transformer is adopted, a station transformer with a high-voltage side of 66kV is commonly oil-changed, and the station transformer with the high-voltage side of 10kV can be a dry-type or cabinet-type transformer, so that the arrangement is convenient; and the grounding transformer in the 66kV side bus can be reduced compared with a transformer with a balance winding.
4. The scheme that the medium voltage side is 66kV voltage level is adopted in the electric main wiring structure of the large-scale offshore booster station suitable for the three main transformers with high reactance. Compared with a voltage class of 35kV, the voltage class of 66kV can reduce the use area of the current collection sea cable, shorten the sea cable laying period and reduce the sea cable loss, and is more suitable for the sea wind turbine generator set with larger capacity and the sea wind farm site with larger scale from the economic and technical aspect.
5. The 400V power distribution device adopts three sections of 400V power distribution buses, wherein two sections of 400V power distribution buses are respectively connected with the 10kV low-voltage side of the three-winding transformer through the 10kV power distribution device and the station transformer unit, one section of 400V power distribution buses is connected with the diesel engine, and the three sections of 400V power distribution buses adopt an annular wiring mode, so that the reliability of station power utilization can be effectively improved through the wiring mode.
In conclusion, the electric main wiring structure suitable for the three-main-transformer high-reactance large-scale offshore booster station is beneficial to realizing compact arrangement of the large-scale offshore booster station and optimization of the overall size and weight of the booster station, so that the investment and construction cost of the offshore booster station is further reduced, and the investment benefit of offshore wind power engineering is improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of an electrical main wiring structure of a large-scale offshore booster station suitable for three main transformers with high reactance.
Fig. 2 is a schematic structural diagram of a 220kV switchgear unit.
Fig. 3 is a schematic structural diagram of a first group of main transformer units.
Fig. 4 is a schematic structural diagram of a third group of main transformer units.
Fig. 5 is a schematic structural view of the high antibody unit.
Fig. 6 is a schematic structural diagram of a 66kV switchgear unit.
Fig. 7 is a schematic structural diagram of a main transformer line interval.
Fig. 8 is a schematic structural view of a fan inlet wire interval.
Fig. 9 is a schematic structural view of a bus bar apparatus of a 66kV switchgear unit.
Fig. 10 is a schematic diagram of the structure of a 10kV distribution device and a station transformer unit.
Fig. 11 is a schematic structural diagram of a main transformer line interval.
Fig. 12 is a schematic diagram of a structure of a bus bar device of a 10kV distribution device and a station transformer unit.
Fig. 13 is a schematic diagram of a 400V power distribution device and a diesel generator unit.
Detailed Description
The utility model will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, an electrical main wiring structure of a large-scale offshore booster station suitable for a three-main transformer with high reactance provided by an embodiment of the present utility model includes: three main transformer units 100, 700, 1200, three 220kV power distribution device units 200, 800, 1300, three high-impedance units 300, 900, 1400 and three 66kV power distribution device units 400, 1000, 1500; two sets of 10kV distribution devices and station transformer units 500 and 1100, and one set of 400V distribution devices and diesel generator units 600.
The structures of a first group of main transformer units 100 and a second group of main transformer units 700 in the three groups of main transformer units are completely consistent, taking the first group of main transformer units 100 as an example, the main transformer comprises a main transformer 111, the main transformer 111 is a three-winding transformer, the main transformer 111 adopts a Y-Y-delta wiring mode, the high-voltage side is connected with a 220kV power distribution device unit 200, the medium-voltage side is connected with a 66kV power distribution device unit 300, and the low-voltage side is connected with a 10kV power distribution device and a station transformer unit 400; a current transformer 112 is arranged on the high-voltage side of the main transformer 111, a neutral point grounding device 113 is arranged on the neutral point of the high-voltage side, a grounding resistor 114 is arranged on the neutral point of the medium-voltage side, and the resistance value of the grounding resistor 114 is selected according to the capacitive current of the wind power plant current collection submarine cable; a third main transformer unit 1200 of the three main transformer units, wherein the main transformer is a transformer 1211 with a balance winding, the high-voltage side is connected with a 220kV power distribution unit 1300, the medium-voltage side is connected with a 66kV power distribution unit 1500, a current transformer 1212 is arranged on the high-voltage side of the main transformer 1211, a neutral point grounding device 1213 is arranged on the neutral point of the high-voltage side, a grounding resistor 1214 is arranged on the neutral point of the medium-voltage side, and the resistance value of the grounding resistor 1214 is selected according to the capacitive current of a current collecting sea cable of a wind power plant; unlike the main transformer units 100 and 700, the low-voltage side winding of the transformer 1211 does not externally lead out a connection terminal as a balance winding.
The structures of the three groups of 220kV power distribution device units 200, 800 and 1300 are completely consistent, the 220kV power distribution device unit 200 is taken as an example, 220kV GIS is adopted, one-in-one-out line transformer group is adopted for wiring, the inlet wire side is connected with the high-voltage side of the main transformer 111, the outlet wire side is connected with a 220kV submarine cable, and a high-resistance inlet wire branch is arranged on the outlet wire side. The electrical equipment in the first group of 220kV distribution device units 200 comprises, in order from the main transformer side to the cable-outgoing side, a lightning arrester 271, a grounding switch 231, a disconnecting switch 221, a grounding switch 232, a current transformer 261, a circuit breaker 211, a second current transformer 262, a grounding switch 233, a disconnecting switch 222, a fast grounding switch 241, a high-impedance incoming line branch composed of the disconnecting switch 223 and the grounding switch 234, a voltage transformer 251 and a lightning arrester 272; wherein, the isolating switches 221 and 222, the current transformers 261 and 262 and the circuit breaker 211 are connected in series to the line, and the rest of the electric equipment and the high-impedance incoming line branch are connected in parallel to the line.
The three groups of high-voltage reactance units 300, 900 and 1400 have completely identical structures, and take the first group of high-voltage reactance units 300 as an example, the three groups of high-voltage reactance units comprise a high-voltage reactor 311, and the high-voltage reactor 311 is a parallel high-voltage reactor with 220kV, three phases and copper coils; a current transformer 312 is connected in series to the high voltage side of the high voltage reactor 311; a current transformer 313 is connected in series on the low voltage side of the high voltage reactor 311.
The three groups of 66kV power distribution device units 400, 1000 and 1500 have completely identical structures, taking the 66kV power distribution device unit 400 as an example, a single bus wire is adopted, and the three groups of 66kV power distribution device units comprise four fan inlet wire intervals 410, 440, 450 and 460, a group of bus equipment 420 and a main transformer outlet wire interval 430; the inlet wire sides of the fan inlet wire intervals 410, 440, 450 and 460 are connected with 66kV current collection sea cables of the wind power plant; the main transformer outlet space 430 is connected to the first group of main transformer units 100 at an outlet side thereof.
Further, the embodiment description is made taking the fan inlet space 410 as an example: the electrical equipment in the fan inlet wire interval 410 is sequentially provided with a zero sequence current transformer 419, a lightning arrester 418, a quick grounding switch 416, a disconnecting switch 413, a grounding switch 415, a current transformer 417, a circuit breaker 411, a grounding switch 414 and a disconnecting switch 412 from a wind farm current collecting submarine cable to a first section 66kV bus.
The main transformer outlet space 430 reduces zero sequence current transformers as compared to the electrical equipment in the fan inlet space 410, with the remaining electrical equipment being arranged identically. The electrical equipment in the main transformer line interval 430 comprises a lightning arrester 438, a quick grounding switch 436, a disconnecting switch 433, a grounding switch 435, a current transformer 437, a circuit breaker 431, a grounding switch 434 and a disconnecting switch 432 from the medium voltage side of the main transformer to the first section 66kV bus in sequence; the bus bar device 420 is connected in parallel to the first 66kV bus bar section, and comprises a grounding switch 422, a disconnecting switch 421, a grounding switch 413, a lightning arrester 414 and a voltage transformer 425.
The two groups of 10kV power distribution devices and station transformer units 500 and 1100 have the same structure, and take the 10kV power distribution devices and the station transformer units 500 as examples, the 10kV power distribution devices are 10kV switch cabinets, and are connected by adopting single bus wires, and the two groups of 10kV power distribution devices comprise 1 main transformer incoming line interval 510, 1 station transformer outgoing line interval 520 and 1 group of bus equipment 530; the station is changed to a dry, cabinet transformer 540.
Further: description of the embodiments taking main transformer line interval 510 as an example: the electrical equipment in the main transformer incoming line interval 510 comprises a lightning arrester 518, a quick grounding switch 516, a disconnecting switch 513, a grounding switch 515, a current transformer 517, a circuit breaker 511, a grounding switch 514 and a disconnecting switch 512 from the main transformer incoming line to a 10kV bus in sequence; the station transformer line spacing 520 is identical in structure to the main transformer line spacing 510; bus bar apparatus 530 is connected in parallel to a 10kV bus bar and includes a grounding switch 532, a disconnector 531, a grounding switch 533, a lightning arrester 534 and a voltage transformer 535.
The 400V distribution device and diesel generator unit 600 comprises 1 diesel generator 611 and 400V distribution buses 621, 622, 623, wherein the first 400V distribution bus 621 is connected with the 10kV distribution device and station transformer unit 500; the second section 400V distribution bus 622 is connected with a 10kV distribution device and a station transformer unit 1100; the third section 400V distribution busbar 623 is connected to the diesel generator 611; an annular wiring mode is adopted among the three sections of 400V distribution buses.
The electric main wiring structure scheme of the large-scale offshore booster station with high reactance of the three main transformers is very suitable for electric main wiring of large-scale offshore wind power engineering with far distance from the shore, so that the scheme simplifies offshore booster station equipment, simplifies the structure of the booster station and reduces the size and weight of the booster station while meeting the sending-out requirement of an offshore wind farm. The method can relieve the cost pressure of the development of the offshore wind power engineering under the requirement of cost reduction and synergy of the offshore wind power in the age of low price, improve the investment benefit of the offshore wind power engineering, enhance the market competitiveness of the offshore wind power and has remarkable comprehensive benefit.
The principles and embodiments of the present utility model have been described with reference to specific examples, which are provided to facilitate understanding of the methods and core ideas of the present utility model; this section should not be construed as limiting the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.
Claims (6)
1. Electric main wiring structure suitable for three main transformer area high resistant large-scale marine booster station, its characterized in that: the electrical main wiring includes: three groups of main transformer units (100, 700, 1200), three groups of 220kV power distribution device units (200, 800, 1300), three groups of high-impedance units (300, 900, 1400), three groups of 66kV power distribution device units (400, 1000, 1500), two groups of 10kV power distribution device and station transformer units (500, 1100) and one group of 400V power distribution device and diesel generator units (600);
The structures of a first group of main transformer units (100) and a second group of main transformer units (700) in the three groups of main transformer units are completely consistent, each main transformer unit comprises a main transformer (111), the main transformer (111) is a three-winding transformer, the high-voltage side of the main transformer (111) is connected with a 220kV power distribution unit (200), the medium-voltage side of the main transformer is connected with a 66kV power distribution unit (400), and the low-voltage side of the main transformer is connected with a 10kV power distribution unit and a station transformer unit (500); and a third main transformer unit (1200) in the three main transformer units comprises a transformer with a balance winding, wherein the high-voltage side of the transformer is connected with the 220kV power distribution unit (1300), the medium-voltage side of the transformer is connected with the 66kV power distribution unit (1500), and the low-voltage side winding is used as the balance winding and is not externally led out of a wiring terminal.
2. An electrical main wiring structure for a three-main transformer high-reactance large-scale offshore booster station as defined in claim 1, wherein: the three groups of 220kV power distribution device units (200, 800 and 1300) are completely consistent in structure, the 220kV power distribution device units are 220kV GIS, a line transformer group with one inlet and one outlet is adopted for wiring, the inlet side is connected with the high-voltage side of the main transformer (111), the outlet side is connected with a 220kV submarine cable, and a high-resistance inlet branch is arranged on the outlet side.
3. An electrical main wiring structure for a three-main transformer high-reactance large-scale offshore booster station as defined in claim 1, wherein: the three groups of high-voltage reactance units (300, 900, 1400) are completely identical in structure and comprise a high-voltage reactor (311), and the high-voltage reactor (311) is a parallel high-voltage reactor with 220kV, three phases and copper coils.
4. An electrical main wiring structure for a three-main transformer high-reactance large-scale offshore booster station as defined in claim 1, wherein: the three groups of 66kV power distribution device units (400, 1000 and 1500) are completely identical in structure and all adopt single bus wiring.
5. An electrical main wiring structure for a three-main transformer high-reactance large-scale offshore booster station as defined in claim 1, wherein: the two groups of 10kV power distribution devices and the station transformer units (500 and 1100) are completely identical in structure, the 10kV power distribution devices are 10kV switch cabinets, and single bus wiring is adopted.
6. An electrical main wiring structure for a three-main transformer high-reactance large-scale offshore booster station as defined in claim 1, wherein: the 400V power distribution device and diesel generator unit (600) comprises 1 diesel generator (611) and 400V power distribution buses, wherein a first section of 400V power distribution buses (621) is connected with a first 10kV power distribution device and station transformer unit (500); the second section 400V distribution bus (622) is connected with a second 10kV distribution device and a station transformer unit (1100); the third section 400V distribution bus (623) is connected with the diesel generator (611); an annular wiring mode is adopted among the three sections of 400V distribution buses.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322292608.3U CN221328447U (en) | 2023-08-24 | 2023-08-24 | Electrical main wiring structure suitable for three-main-transformer high-reactance large-scale offshore booster station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322292608.3U CN221328447U (en) | 2023-08-24 | 2023-08-24 | Electrical main wiring structure suitable for three-main-transformer high-reactance large-scale offshore booster station |
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| CN221328447U true CN221328447U (en) | 2024-07-12 |
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| CN202322292608.3U Active CN221328447U (en) | 2023-08-24 | 2023-08-24 | Electrical main wiring structure suitable for three-main-transformer high-reactance large-scale offshore booster station |
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