CN207039041U - A modular prefabricated substation - Google Patents

Abstract

A kind of modularization preassembled transformer station, include main transformer module, 110kVGIS modules, 35kV EM equipment modules, 35kV SVG modules, electrical equipment of standing module, secondary device module, rest module on duty.Transformer module uses outdoor installation, and remaining each module is mounted in advance to be met inside international standard sized containers.Electrical equipment of standing module and rest block combiner on duty are in a casing；Secondary device module is divided in two independent casings；Remaining module is independent into case.Each cabin indoor equipment complete design, manufacture, installation and back panel wiring in factory.It is qualified integrally to be debugged before dispatching from the factory, and using casing as delivery unit, transports power station scene to.Casing is completed with after the fixation of live concrete pedestal, carrying out the secondary connection work between nacelle, the overall debugging in power station is finally carried out by unit in charge of construction.

Description

A modular prefabricated substation

【Technical field】

The utility model relates to the field of a box-type substation, in particular to the field of a prefabricated substation suitable for a voltage level of 110kV.

【Background technique】

At present, wind energy, tidal energy and solar energy are widely used in new energy power generation. The low-voltage electricity output by the generator outputs 10-35kV medium-voltage electricity through the step-up substation, of which the 35kV voltage level has more advantages in terms of installation, use, and energy saving; the medium-voltage electricity is then transmitted to the The central step-up station of the new energy electric field is connected to a high-voltage power grid system of 110KV and above. Therefore, the central step-up station of a typical new energy electric field is a 35kV/110kV substation.

The high-voltage switch modules mentioned in the patent CN104917086A "Outdoor Prefabricated Substation" and the patent CN204391537u "Modular Substation System" are mainly aimed at 35kV switchgear. Since 35kV switchgear exists in the form of switch cabinets, box-type pre-installed It is easier to realize, and this technology has been applied to a certain extent at home and abroad.

But for the 110kV substation, its modularization and prefabrication are still in the experimental stage. Since the main transformer and high-voltage switchgear involved in the 110kV substation are very different from the medium and low-voltage equipment in terms of component composition and physical size, the construction of the power station is mainly based on the conventional basic construction mode. As the construction of substations moves towards a development mode that reduces land occupation, reduces substation cost, shortens construction period, coordinates with the surrounding environment, and improves operational reliability, a new substation construction mode is urgently needed for the construction of 110kV substations.

【Content of invention】

The technical problem to be solved by the utility model is to carry out modular division for the 35kV/110kV step-up station of a typical new energy electric field, and carry out a pre-installed design to realize the systematic and centralized design of each part of the substation; the focus is on the 110kV high-voltage The prefabricated design of switchgear and main transformer in this construction mode, as well as the research on the arrangement and connection of each module of the power station in the new mode.

The utility model adopts the following technical solutions:

A modular prefabricated substation, which is used to boost the 35kV medium voltage of new energy power generation to 110kV and above high voltage power, and the low voltage power of the substation is connected to a new energy power station; the high voltage output of the substation is connected to the system grid, The substation includes: main transformer module, 110kVGIS module, 35kV equipment module, 35kV reactive power compensation equipment module, station electrical equipment module, secondary equipment module, and on-duty rest module. The equipment module and the on-duty rest module are pre-installed in the same container that meets the international standard size, which is called the station equipment cabin and rest duty room; the secondary equipment module is packed in two independent containers that meet the international standard size, respectively They are called secondary equipment compartment Ⅰ and secondary equipment compartment Ⅱ; the rest of the modules are independently boxed and installed in containers that meet international standards, and are called 110kV GIS compartment, 35kV equipment compartment, and SVG equipment compartment.

Each container in the modularized prefabricated substation adopts a plane layout.

The high-voltage side of the main transformer module is connected to the 110kV GIS cabin by a 110kV cable; the low-voltage side of the main transformer module is connected to the 35kV equipment cabin by a 35kV cable; the 35kV equipment cabin is connected to the SVG equipment cabin by a 35kV cable; the outdoor transformer, the 110kV GIS cabin, The 35kV equipment cabin, SVG equipment cabin, station electrical equipment cabin and rest duty room are respectively connected to the secondary equipment cabin with control cables and power cables; the 35kV equipment cabin is connected to the new energy power station through 35kV cables; the 110kV GIS cabin is connected through overhead lines to the system grid.

The radiator of the main transformer module is installed on the oil tank, and a butterfly valve is installed at the installation place, so that there is no need to drain oil when installing or removing the radiator, and the high-voltage and low-voltage sides of the transformer are used for cable outlets.

The 110kVGIS module includes: a line bay, a main transformer bay, a bus bay, and an LCP control cabinet, wherein the line bay and the main transformer bay, and the line bay and the bus bay are respectively connected through bus barrels, and the LCP controls The cabinets are arranged independently of the intervals; the line intervals, main transformer intervals, main installation intervals and LCP control cabinets of the GIS are all installed on the chassis, and the bridges used for wiring are connected and fixed on the chassis, and the primary cables of the GIS body pass through the bridges, Chassis, connected to the LCP control cabinet.

The above-mentioned line interval adopts a three-phase bushing outlet, and the three-phase bushing is designed to pass through the wall; the main transformer interval adopts a cable terminal outlet.

The GIS is bolted to the bottom surface of the container through the underframe. When the GIS interval needs to be exchanged and overhauled, the GIS can be separated from the container by simple disassembly, and the GIS and the container will not be damaged.

The 110kV GIS cabin is reserved with an expansion interface through which the equipment in the expansion cabin is connected during expansion; the 110kV GIS cabin is connected to the expansion interface through a connecting bus.

The 35kV equipment cabin includes: 3 incoming line cabinets, 1 SVG outgoing line cabinet, 1 station transformer cabinet, 1 PT cabinet, 1 step-up outgoing line cabinet, 1 grounding transformer cabinet, and grounding transformer and resistor Transformers for cabinets and stations; the booster outlet cabinet leads the busbar out of the box through the busbar bridge, and connects to the low-voltage side of the main transformer module through cables; the inlet and outlet cabinets are connected to the input interface of the new energy power station by the lower cable connection; the SVG outlet cabinet It is connected to the SVG cabin through cables; the 35kV grounding transformer cabinet is connected to the grounding transformer through cables.

The secondary equipment cabin is divided into functions according to functions: a protection control equipment cabin and a communication power supply equipment cabin; a screen cabinet installation frame foundation is set on the bottom plate of the cabin body, and at the same time it is used as a cable interlayer, where the secondary cables in the cabin are laid; in addition, There is a wiring cabinet in the secondary equipment cabin, and centralized wiring is adopted in the container, and the cables in the container are connected to the outside after being centralized by the wiring cabinet.

Compared with the prior art, the utility model has at least the following beneficial effects: the utility model patent installs the main transformer module outdoors, packs the station electrical equipment and the on-duty rest module in the same container, and packs the secondary equipment separately In two separate containers, other modules are packed separately in their own containers. This design fully considers the uniformity of the box specifications, and also considers the utilization rate of the box and the safety of the equipment. Not only does the substation take up less space, but also greatly reduces the cost of the substation and shortens the construction period.

【Description of drawings】

Figure 1 is a schematic diagram of the composition of functional modules of a modular prefabricated substation;

Figure 2 is a schematic diagram of the layout of a modular prefabricated substation;

Fig. 3 is a schematic diagram of electrical main wiring of a modular prefabricated substation.

Figure 4 is a schematic diagram of the layout and expansion plan of the 110kV GIS cabin;

Fig. 5 is a schematic diagram of a three-dimensional model of a 110kV GIS cabin;

Fig. 6 is a schematic diagram of cable connections between cabins of a modular prefabricated substation site.

【detailed description】

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Referring to Figure 1, the utility model provides a modular prefabricated substation, which is used to boost the 35kV medium voltage of new energy power generation to 110kV high voltage; the low voltage power of the power station is connected to a new energy power station; the power station The high-voltage output is connected to the system grid, mainly composed of main transformer module 1, 110kVGIS module, 35kV equipment module (including 35kV switchgear, 35kV grounding equipment, transformer), 35kV reactive power compensation equipment module (SVG module), station power equipment module ( It consists of seven functional modules including low-voltage switchgear, station transformer, etc.), secondary equipment module, and on-duty rest module. Referring to Fig. 2, a modular prefabricated substation provided by the utility model adopts factory prefabrication. Due to the large capacity and volume of the transformer, in the embodiment shown in FIG. 2 , the transformer module 1 adopts an outdoor mode. Under the premise of fully considering the uniformity of the cabinet specifications, the utilization rate of the cabinet and the safety of the equipment, two or more small modules can be combined in one cabinet, or a large module can be disassembled and pre-assembled in more than two boxes. In the embodiment shown in Fig. 2, the station electrical equipment module and the on-duty rest module are combined in a box body, which is called the station equipment cabin and rest duty room 4; the secondary equipment modules are packed in two independent boxes, Named as secondary equipment cabin Ⅰ6 and secondary equipment cabin Ⅱ7; the remaining modules are individually boxed and named: 110kV GIS cabin 5, 35kV equipment cabin 2, and SVG equipment cabin 3. Each cabin is relatively independent in design and has the conditions for later expansion.

In the embodiment shown in Figure 2, each prefabricated cabin body adopts a standard container, and the overall dimensions and structural strength of the cabin body meet the overall transportation conditions; the cabin body is uniformly numbered and named, and coloring and pattern design are carried out according to user needs; Lifting devices are installed on the top or bottom; door structures are installed at reasonable positions around the box to facilitate testing and maintenance; wired telephones are installed on the inner wall of the cabin to ensure reliable communication between the cabin and the outside world and improve the safety of operators in the prefabricated cabin during operation.

In the embodiment shown in Figure 2, the main transformer module 1 and the other 6 cabins are arranged in the power station in a single plane; Arrangement in an integrated manner, for example, the 110kV GIS cabin 5 is arranged on the top of the secondary equipment cabin I6 and the secondary equipment cabin II7.

The 110 kV GIS cabin 5 in this embodiment will be described with reference to FIG. 3 and FIG. 4 . As shown in Figure 3, the 110kVGIS module is mainly composed of a line bay 5-1, a main transformer bay 5-2, and a bus bay 5-3. 2 Connect the cable terminal to the high-voltage side of the main transformer module 1. As shown in Figure 4, the line bay 5-1 and the main transformer bay 5-2 are connected through the bus barrel 5C, and the line bay 5-1 and the bus bay 5-3 are connected through the bus barrel 5D; the LCP control cabinet 5 -4 is arranged independently of the interval; the three-phase bushing 5-1-1 of the line interval 5-1 is designed to pass through the wall, and is arranged on the side of the container box 5-5, which needs to be disassembled during transportation; 110kVGIS reserves a later expansion interface 5A and 5B, during expansion, it is connected to the equipment in the expansion cabin through the expansion interface; in the embodiment, the 110kV GIS cabin 5 is connected to the expansion interface 5A through the connection bus 5F.

Referring to Fig. 5, each interval of the 110kV GIS in this embodiment is installed on the chassis, and the cable bridge connection for wiring is also fixed on the chassis. The primary cable of the GIS main body passes through the bridge frame and the chassis, and is connected to the LCP control cabinet. The GIS is connected and fixed with the bottom surface of the box 5-5 through the bottom frame, and the connection is in the form of bolt connection, avoiding the welding form; the advantage of this connection scheme is that when the GIS interval needs to be replaced and repaired, only simple screw removal is required The GIS can be separated from the cabinet without destroying the GIS and the cabinet.

The 35kV equipment cabin 2 in this embodiment will be described with reference to FIG. 3 . 35kV equipment compartment 2 includes: 3 incoming line cabinets 2-1, 2-2, 2-3, 1 SVG outgoing line cabinet 2-6, 1 station transformer cabinet 2-9, 1 PT cabinet 2-5, 1 booster outlet cabinet 2-4, 1 grounding transformer cabinet 2-7, in addition, grounding transformer and resistance cabinet 2-8 and station transformer 2-10 are also arranged in 35kV equipment cabin 2. Among them, the step-up outgoing line cabinet 2-4 leads the bus bar out of the box through the bus bar bridge, and connects with the low-voltage side of the main transformer module 1 through the cable; the incoming and outgoing line cabinets 2-1, 2-2, and 2-3 adopt the lower cable connection Connect to the input interface of the new energy power station; the SVG outlet cabinet 2-6 is connected to the SVG cabin 3 through cables; the 35kV grounding transformer cabinet 2-7 is connected to the station transformer 2-10 through cables. The overall structure of the 35kV switchgear is in the form of single busbar, double gas chambers and solid insulated busbar connection. The prefabrication technology of 35kV switchgear is relatively mature.

In the embodiment shown in FIG. 2 , the voltage level of the main transformer module 1 is 110kV/35kV. The transformer is mainly composed of a body, an oil storage tank and a radiator; the radiator is installed on the oil tank, and a high-quality butterfly valve is installed at the installation place, so that there is no need to drain oil when installing or removing the radiator. It is characterized in that both the high voltage and low voltage sides of the transformer adopt cable outlets.

In the embodiment shown in Fig. 2, secondary equipment cabins I (6) and II (7) are divided into protection control equipment cabins and communication power supply equipment cabins according to their functions. Its main equipment is an array of screen cabinets arranged in parallel. The main configuration of the screen cabinet includes relay protection equipment, digital measurement equipment, time synchronization equipment, monitoring host and data server, integrated power supply, GIS detection and diagnosis system, fire protection, video monitoring system, etc. . The cabin design of the secondary equipment cabin is different from the prefabrication of the 110kV GIS cabin. The screen cabinet installation frame foundation is set on the bottom of the cabin, and it is also used as a cable interlayer, where the secondary cables in the cabin are laid. In particular, in this embodiment, a wiring cabinet is installed in the secondary equipment cabin; centralized wiring is adopted in the box, and the cables in the box are connected to the outside after being centralized by the wiring cabinet. The on-site wiring work saves time and effort, and the accuracy is high.

In the embodiment shown in Fig. 2, the setting of the station equipment cabin and the rest duty room is to assemble and combine two smaller modules of the station equipment module and the duty rest module inside a prefabricated box. In this embodiment, the station electrical equipment includes a 50kVA dry-type station transformer, four 400V switch cabinets, and the station equipment cabin and rest duty room 4 instead of the traditional building-style power distribution room and duty room , The cabin contains about 10 square meters of rest and duty space. The design of this cabin meets the requirements of building functions and space use, and the comfort and safety are due to the structure of the building. Its design conforms to the concept of green energy saving.

The equipment in each cabin is designed, manufactured, installed and internally wired in the factory. The overall debugging is qualified before leaving the factory, and the box is used as the transportation unit to arrive at the power station site. After the box body is fixed with the cement foundation on site, the secondary wiring work between the cabin bodies will be carried out, and finally the overall commissioning of the power station will be carried out by the construction unit.

Simple cement foundation and cable trench design are required on the site of the power station. Cable trenches are provided on both sides of the box body. The base of the cabinet is provided with holes for passing cables. The connecting cables between the boxes pass through the cable hole at the base of the box and enter the cable trench for laying. The on-site connection work of the modular prefabricated power station will be described in detail with reference to Fig. 2 and Fig. 6 .

The main transformer module 1 and the other 6 prefabricated cabins shown in Fig. 2 are manufactured, assembled, and passed the test, and then they are transported to the power station site as an independent transport unit. After the 6 prefabricated cabins and the chassis of the outdoor transformer (1) are fixed to the on-site cement foundation, the secondary wiring between the cabins (including the outdoor transformer) is carried out.

Fig. 2 shows the laying path of the cable trench in the embodiment. The cable trench is arranged on the outsides of both sides of the cabin body. The base of each cabin body is provided with a cable passing hole. The communication cables between the cabins pass through the cable hole at the base of the box and enter the cable trench for laying.

The cable connection between the prefabricated equipment cabins (including outdoor transformers) on the power station site will be described with reference to Fig. 6 . The on-site connection work involves the following aspects: the connection between the high-voltage side of the main transformer module 1 and the 110kV GIS cabin 5 uses 110kV cables; the connection between the low-voltage side of the main transformer module 1 and the 35kV equipment cabin 2 uses 35kV cables; the 35kV equipment cabin 2 The connection with SVG equipment cabin 3 adopts 35kV cables; main transformer module 1, 110kV GIS cabin 5, 35kV equipment cabin 2, SVG equipment cabin 3, station electrical equipment cabin and rest duty room 4 and the secondary equipment cabin respectively Connection, using control cables and power cables. The 35kV equipment cabin 2 is connected to the new energy power station through 35kV cables; the 110kV GIS cabin 5 is connected to the system grid through overhead lines.

The external dimensions and structural strength of the prefabricated box body are required to meet the overall vehicle transportation conditions. Set up a lifting device on the top or bottom of the box. The door structure is set at a reasonable position around the box to facilitate testing and maintenance. A wired telephone is installed on the inner wall of the cabin to ensure reliable communication between the inside and the outside world and improve the safety of the operators in the prefabricated cabin during operation.

Claims (10)

1. A modular prefabricated substation, which is used to boost the 35kV medium-voltage power generated by new energy to 110kV and above high-voltage power, and the low-voltage power of the substation is connected to a new energy power station; the high-voltage output of the substation is connected to the system The power grid is characterized in that the substation includes: a main transformer module, a 110kVGIS module, a 35kV equipment module, a 35kV reactive power compensation equipment module, a station electrical equipment module, a secondary equipment module, and a duty rest module, wherein the main transformer module adopts For outdoor installation, the station electrical equipment module and the on-duty rest module are pre-installed in the same container that meets the international standard size, called the station equipment cabin and rest duty room (4); the secondary equipment modules are packed in two independent They are called secondary equipment compartment Ⅰ(6) and secondary equipment compartment Ⅱ(7) in containers conforming to the international standard size; 110kV GIS cabin (5), 35kV equipment cabin (2), SVG equipment cabin (3). 2. A modularized prefabricated substation according to claim 1, characterized in that: each container in the modularized prefabricated substation is arranged in a plane. 3. A modularized prefabricated substation according to claim 1, characterized in that: the high voltage side of the main transformer module (1) is connected to the 110kV GIS cabin (5) by a 110kV cable; the main transformer module (1 ) is connected to the 35kV equipment cabin (2) by 35kV cables; the 35kV equipment cabin (2) is connected to the SVG equipment cabin (3) by 35kV cables; the main transformer module (1), 110kV GIS cabin (5), and 35kV equipment cabin (2), SVG equipment cabin (3), station electrical equipment cabin and rest duty room (4) are respectively connected to the secondary equipment cabin with control cables and power cables; 35kV equipment cabin (2) is connected to the new energy through 35kV cables Power station; the 110kV GIS cabin (5) is connected to the system grid through overhead lines. 4. A modular prefabricated substation according to claim 1 or 3, characterized in that: the radiator of the main transformer module is installed on the oil tank, and a butterfly valve is provided at the installation place, so as to install or remove the radiator It is not necessary to drain the oil during operation, and both the high voltage and low voltage sides of the transformer are used for cable outlets. 5. A modularized prefabricated substation according to claim 1, characterized in that: said 110kVGIS module includes: line bay (5-1), main transformer bay (5-2), bus bay ( 5-3), and the LCP control cabinet (5-4), wherein, between the line interval (5-1) and the main transformer interval (5-2), between the line interval (5-1) and the main interval (5- 3) They are respectively connected by bus barrels (5C, 5D), and the LCP control cabinet (5-4) is arranged independently of the interval; the GIS line interval (5-1), main transformer interval, bus installation interval and LCP control cabinet are Installed on the base frame, the bridge used for wiring is connected and fixed on the base frame, the primary cable of the GIS body passes through the bridge frame and the base frame, and is connected to the LCP control cabinet. 6. A modular prefabricated substation according to claim 5, characterized in that: the line interval adopts a three-phase bushing outlet, and the three-phase bushing is designed to pass through the wall; the main transformer interval adopts a cable terminal outlet. 7. A modularized prefabricated substation according to claim 5, characterized in that the GIS is connected to the bottom surface of the container by bolts through the underframe, and when it is necessary to replace and overhaul the GIS interval, it only needs to be simply disassembled Separate GIS from container without breaking GIS and container. 8. A modularized prefabricated substation according to claim 5, characterized in that: said 110kV GIS cabin is reserved with expansion interfaces (5A, 5B), and the equipment in the expansion cabin is connected with the expansion interface during expansion. Connect; the 110kV GIS cabin (5) is connected to the expansion interface (5A) through the connecting busbar (5F). 9. A modular prefabricated substation according to claim 1, characterized in that: the 35kV equipment cabin (2) includes: 3 incoming line cabinets (2-1, 2-2, 2-3 ), 1 SVG outlet cabinet (2-6), 1 station transformer cabinet (2-9), 1 PT cabinet (2-5), 1 step-up outlet cabinet (2-4), 1 ground Transformer cabinet (2-7), grounding transformer and resistance cabinet (2-8) and station transformer (2-10); step-up outlet cabinet (2-4) leads the busbar out of the box through the busbar bridge, and passes the cable Connect to the low-voltage side of the main transformer module (1); the incoming and outgoing line cabinets (2-1, 2-2, 2-3) are connected to the input interface of the new energy power station by the down cable connection; the SVG outgoing line cabinet (2-6) passes through The cables are connected to the SVG equipment compartment (3); the 35kV grounded transformer cabinet (2-7) is connected to the station transformer (2-10) through cables. 10. A modular prefabricated substation according to claim 1, characterized in that: the secondary equipment compartment is divided into functions: a protection control equipment compartment and a communication power supply equipment compartment; The cabinet is installed as the frame foundation, and at the same time as the cable interlayer, the secondary cables in the cabin are laid here; in addition, there is a wiring cabinet in the secondary equipment cabin, and centralized wiring is adopted in the container. External wiring.