CN104917086A - Outdoor prefabricated transformer substation - Google Patents

Abstract

The invention discloses an outdoor prefabricated substation. By adopting the design concept of miniaturized modular prefabrication, the substation is designed as a prefabricated assembly structure, including civil engineering parts and electrical parts. Most of the civil engineering parts adopt prefabricated products. Among them, the strip foundations of containers and preloaded cabins, and the foundations of transformers need to be prefabricated on site. Except for the transformer, the electrical part adopts container-type or prefabricated cabin-type modules, and the incoming line module adopts box-type gas insulated sealing equipment (GIS) module. The whole GIS module is installed in the container or prefabricated cabin, and the incoming line adopts cable mode The transformer is connected to the GIS module through oil and gas bushings or overhead wires. The on-site foundation prefabrication of the civil engineering part and the in-factory production and commissioning of each functional module of the electrical part are carried out in parallel, so that the construction period is greatly reduced. The invention adopts prefabricated assembly of modular structure, breaks through the traditional substation construction idea, and has high efficiency.

Description

Outdoor prefabricated substation

【Technical field】

The invention relates to the technical field of electric equipment, in particular to an outdoor prefabricated substation.

【Background technique】

With the rapid development of the national economy and society, the demand for electric energy is also increasing, and land and space resources are becoming more and more scarce. It is becoming more and more difficult to implement the substation site and line channel in the power grid planning. Power grid construction presents the characteristics of heavy tasks, high requirements, tight construction schedules, difficulties in land acquisition and policy handling, and the construction of substations is becoming more difficult. Due to the needs of rapid urbanization, industrialization and rapid economic development, power grid planning should be compatible with urban economy and development planning, and the progress of power grid construction should be compatible with national economic and social development, and the construction of substations is an important part of power grid construction .

The construction modes of traditional substations mainly include the following types:

Outdoor substation construction mode: high-voltage switchgear is arranged outdoors, transformers are placed outdoors, 20 (10) kV equipment is arranged in the switchgear in the form of indoor switchgear, and all electrical equipment is connected in the open air, that is, between equipment. Bare conductors or busbar terminal strips, supported by outdoor structural supports for connection. Since the high-voltage equipment and its connections are directly exposed outdoors, the requirements for the environment and insulation coordination are high. The substation usually has a towering structure, complex layout of high-voltage lines, large volume and spacing of power facilities, and occupies a lot of land, which is not coordinated with the surrounding environment. Choosing a construction site is difficult.

Indoor substation construction mode: All or part of the electrical equipment is installed indoors. The high-voltage equipment mostly uses gas-insulated closed equipment, and the electrical equipment is mostly connected by cables. The indoor substation solves the contradiction between the substation and the land and the environment to a certain extent, but it requires the construction of existing buildings, and the installation and commissioning workload is heavy, the construction period is long, and the overall cost is about twice higher than that of the outdoor substation.

Underground or semi-underground substation construction mode: This mode is close to the indoor substation construction mode, but all or part of all electrical equipment is installed below the ground, which saves land area more effectively, but the substation construction and maintenance of this mode Running costs are high.

The above three substation models are construction methods in which the equipment is distributed and delivered to the site, and then installed and debugged. Their disadvantage is that, from substation feasibility study and project approval to completion and operation, each substation needs to go through complex processes such as design, bidding, on-site installation, and on-site commissioning.

【Content of invention】

In view of this, in order to overcome the deficiencies of the prior art, the present invention provides an outdoor prefabricated substation. By adopting the design concept of miniaturized modular prefabrication, the substation is designed as a prefabricated assembly structure. It only needs to be laid, Hoisting in place and connection for commissioning, convenient construction, low cost, and effective reduction of maintenance investment.

To achieve the above object, the technical scheme of the present invention is as follows:

The outdoor prefabricated substation adopts the design idea of miniaturized modular prefabrication to design the substation into a prefabricated structure, including the civil engineering part and the electrical part. The civil engineering part adopts prefabricated products. The strip foundation and the foundation of the transformer need to be prefabricated on site; except for the transformer, the electrical parts are container-type or prefabricated cabin-type modules, and the incoming line modules are box-type gas-insulated enclosure (GIS) modules.

The above-mentioned container-type or prefabricated cabin-type modules are produced and debugged in the factory, and the transportation is convenient. The site only needs to be fixed and adjusted to the corresponding civil engineering foundation according to the design, and the joint debugging between the modules is carried out, which greatly reduces the workload on site.

Preferably, the container and the prefabricated cabin foundation adopt a strip foundation, and there are four strip foundations in total, and the strip foundations at both ends are provided with embedded parts for fixing to the bottom of the container and the prefabricated cabin respectively.

The strip foundations of the container and the preloaded cabin, and the foundation of the transformer are all higher than the ground by more than 60cm, which is convenient for the installation of subsequent equipment and functional modules. Among them, the fire fighting room, guard room, tool room, etc. are assembled by containers; the cable trench is made of grooved boxes, the cable bracket is made of steel bracket or composite material bracket, and the communication channel is assembled with prefabricated concrete; The curbs and street light foundations are prefabricated with concrete, which greatly reduces the workload on site.

Further, the transformer is connected to the gas-insulated enclosure (GIS) module through oil and gas bushings or overhead wires.

The high-voltage side of the transformer is connected to the box-type GIS module through oil-gas bushings or overhead wires as required, and the terminals on the low-voltage side adopt cable outlets.

The gas insulated enclosure (GIS) module is composed of circuit breaker, busbar, isolating switch, voltage transformer, current transformer, lightning arrester, busbar and bushing. SF6 gas is used as insulating medium. The entire GIS module is installed in a container or a prefabricated cabin, and the incoming line adopts the cable method. The transformer and the GIS module are connected through oil and gas bushings or overhead wires, and the GIS and GIS are connected through the GIL method.

The substation also includes switch cabinets, reactive power compensation modules and arc suppression coil modules, which are integrated into containers or prefabricated cabins and fixed on prefabricated strip foundations.

The switchgear is a 10kV switchgear, all of which are installed in containers or prefabricated cabins, and can be arranged in single or double rows, with cables entering and exiting. The switchgear is based on the channel steel welded at the bottom of the box body and fixed on the prefabricated strip foundation.

Further, a temporary support is provided between the switch cabinet body and the box or cabin, so as to ensure the transportation safety of the equipment during transportation. The entire switchgear device is not affected by the external environment, ensuring operational reliability and personal safety, and realizing maintenance-free.

The reactive power compensation module adopts box-type capacitors and is fixed on a prefabricated strip foundation. The box-type capacitors are produced and debugged in the factory, and the size of the box meets the transportation requirements. The whole body is transported to the site and fixed on the prefabricated strip foundation. Among them, the series reactor adopts 6% dry-type iron core reactor, and the switch adopts SF6 gas-insulated miniaturized vacuum switchgear. Compared with the conventional capacitor bank device, the space and occupied area are greatly improved.

The arc-suppression coil module adopts a box-type arc-suppression coil complete set, and the arc-suppression coil and its auxiliary equipment are integrated into the container or the prefabricated cabin.

Further, the container and the prefabricated cabin adopt a cable access method, and the cable adopts a bottom access method, and the inlet is set near the end of the container and the prefabricated cabin to facilitate connection. The inlet is divided into an optical cable inlet and a cable inlet.

The container and the prefabricated cabin are selected and prefabricated according to the size of the equipment under the premise of meeting the transportation requirements. The material of the box body and the cabin body meets the requirements of heat preservation and anti-corrosion heat insulation. The cabinet and cabin are equipped with doors that are easy to open according to the layout of the internal equipment for easy maintenance. The top is set with a slope to prevent rainwater and snow accumulation, and the interior meets the requirements of maintenance, fire protection and lighting. The bottom is fixed with the foundation through the embedded parts of the strip foundation.

The beneficial effect of the present invention is that, in the prefabricated substation construction mode, each component module adopts a standard interface, which can realize modular replacement and expansion, from the civil engineering to the electrical part, breaking through the traditional substation construction idea, occupying a small area and allowing on-site work Small quantity, short construction period, low comprehensive cost, easy to coordinate with the environment.

The container type or prefabricated cabin type structure adopted by the present invention makes the equipment in the substation not affected by the external environment, and will not affect the surrounding environment. Each module can be flexibly arranged according to the terrain, which is less affected by the terrain of the substation and convenient for site selection. Each module adopts a compact design and occupies a small area. The area occupied by the entire substation is greatly reduced, which effectively reduces the comprehensive investment.

【Description of drawings】

In order 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 that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the front view of the prefabricated cabin in the present invention.

Figure 2 is a schematic diagram of the basic structure of the container and the prefabricated cabin in the substation.

Fig. 3 is a structural schematic diagram of the cable inlet at the bottom of the container and the prefabricated cabin.

Fig. 4 is a schematic structural diagram of a switch cabinet arranged in a single row.

Fig. 5 is a structural schematic diagram of a double row arrangement of switch cabinets.

【Detailed ways】

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The outdoor prefabricated substation adopts the design idea of miniaturized modular prefabrication to design the substation into a prefabricated structure, including the civil engineering part and the electrical part. The civil engineering part adopts prefabricated products. The strip foundation and the foundation of the transformer need to be prefabricated on site; except for the transformer, the electrical parts are container-type or prefabricated cabin-type modules, and the incoming line modules are box-type gas-insulated enclosure (GIS) modules.

As shown in Fig. 1, an access door 1 is arranged on the side of the prefabricated cabin, an air-conditioning external unit 2 is installed near the end, and a ventilation shutter 3 is installed on the right side of the air-conditioning external unit 2.

The container and prefabricated cabin foundations shown in Fig. 2 have four base strip foundations 4 in total, and the strip foundations at both ends are provided with embedded parts 5 for fixing to the bottom of the container and the prefabricated cabin respectively. The strip foundations of the container and the preloaded cabin, and the foundation of the transformer are all higher than the ground by more than 60cm, which is convenient for the installation of subsequent equipment and functional modules. Among them, the fire fighting room, guard room, tool room, etc. are assembled by containers; the cable trench is made of grooved boxes, the cable bracket is made of steel bracket or composite material bracket, and the communication channel is assembled with prefabricated concrete; The curbs and street light foundations are prefabricated with concrete, which greatly reduces the workload on site.

The above-mentioned container-type or prefabricated cabin-type modules are produced and debugged in the factory, and the transportation is convenient. The site only needs to be fixed and adjusted to the corresponding civil engineering foundation according to the design, and the joint debugging between the modules is carried out, which greatly reduces the workload on site.

The transformer is connected to the gas insulated enclosure (GIS) module through oil and gas bushings or overhead wires. The high-voltage side of the transformer is connected to the box-type GIS module through oil-gas bushings or overhead wires as required, and the terminals on the low-voltage side adopt cable outlets. The gas insulated enclosure (GIS) module is composed of circuit breaker, bus bar, isolating switch, voltage transformer, current transformer, lightning arrester, bus bar, bushing and eight high-voltage electrical appliances, and each high-voltage electrical component is sealed in a grounded metal cylinder , with SF6 gas as the insulating medium. The entire GIS module is installed in a container or a prefabricated cabin, and the incoming line adopts the cable method. The transformer and the GIS module are connected through oil and gas bushings or overhead wires, and the GIS and GIS are connected through the GIL method.

Referring to Fig. 3, the container and the prefabricated cabin adopt the cable access mode, and the cable adopts the bottom access mode, and the inlet is arranged at the position near the end of the container and the prefabricated cabin to facilitate connection, and the inlet is divided into Optical cable inlet 6 and cable inlet 7.

The outdoor prefabricated substation of the present invention also includes a switch cabinet, a reactive power compensation module and an arc suppression coil module, integrated into a container or a prefabricated cabin, and fixed on a prefabricated bar-shaped foundation.

The switch cabinets are all installed in containers or prefabricated cabins, completed production and commissioning in the factory, transported to the site as a whole, and fixed on the prefabricated strip foundation. Each switch cabinet enters and exits the line through cables, and adopts the bottom line entry scheme.

The switchgear shown in Figure 4 is arranged in a single row, and the switchgear shown in Figure 5 is arranged in a double row. Both types of switchgears use the channel steel welded at the bottom of the box as the installation basis. The switchgear body and the box Temporary support is set between the body or cabin to ensure the safety of the equipment during transportation.

The reactive power compensation module adopts box-type capacitors. The box-type capacitors are produced and debugged in the factory. The size of the box body meets the transportation requirements.

Among them, the series reactor adopts 6% dry iron core reactor, and the switch adopts SF6 gas insulated miniaturized vacuum switchgear. Compared with the conventional capacitor bank device, the space and occupied area are greatly improved.

The arc-suppression coil module above adopts a box-type arc-suppression coil complete set, and the arc-suppression coil and its auxiliary equipment are integrated into the container or the prefabricated cabin.

The on-site foundation prefabrication of the above-mentioned civil works and the in-factory production and commissioning of the electrical functional modules can be carried out in parallel, which greatly reduces the construction period of the entire substation.

The prefabricated cabin is equipped with a unified interface box as the interface of the prefabricated cables and optical cables inside and outside the cabin, and the interfaces in the interface box are arranged according to the cable and optical cable access partitions. The part in the cabin is installed and debugged before leaving the factory, and the site only needs to complete the connection of the interface to improve the speed of on-site construction.

The container and the prefabricated cabin are selected and prefabricated according to the size of the equipment under the premise of meeting the transportation requirements. The material of the box body and the cabin body meets the requirements of heat preservation and anti-corrosion heat insulation. The cabinet and cabin are equipped with doors that are easy to open according to the layout of the internal equipment for easy maintenance. The top is set with a slope to prevent rainwater and snow accumulation, and the interior meets the requirements of maintenance, fire protection and lighting. The bottom is fixed with the foundation through the embedded parts of the strip foundation.

In the prefabricated substation construction mode described in the present invention, each module adopts a standard interface, which can realize modular replacement and expansion. From civil engineering to electrical parts, it breaks through the traditional substation construction idea, occupies a small area, and requires less on-site workload. The cycle is short, the comprehensive cost is low, and it is easy to coordinate with the environment.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. The outdoor prefabricated substation is characterized in that the substation is designed as a prefabricated structure by adopting the design concept of miniaturized modular prefabrication, including the civil engineering part and the electrical part, and the civil engineering part adopts prefabricated products, among which The strip foundations of containers and pre-loaded cabins, and the foundation of transformers need to be prefabricated on site; except for transformers, the electrical parts are all container-type or prefabricated cabin-type modules, and the incoming line modules are box-type gas-insulated sealing equipment (GIS) modules. 2. The outdoor prefabricated substation according to claim 1, wherein the container and the prefabricated cabin foundation adopt a strip foundation, and there are four strip foundations in total, and the strip foundations at both ends are provided with embedded parts, To be respectively fixed with the container and the bottom of the prefabricated warehouse. 3. The outdoor prefabricated substation according to claim 1, characterized in that the strip foundations of the container and the prefabricated compartment, and the foundation of the transformer are all 60 cm above the ground. 4. The outdoor prefabricated substation according to claim 1, characterized in that the transformer and the gas insulated enclosure (GIS) module are connected through oil and gas bushings or overhead wires. 5. The outdoor prefabricated substation according to claim 4, characterized in that, the high voltage side of the transformer is connected to the box-type GIS module through oil and gas bushings or overhead wires as required, and the terminals on the low voltage side adopt cable outlets. 6. The outdoor prefabricated substation according to claim 1, characterized in that it also includes a switch cabinet, a reactive power compensation module and an arc suppression coil module, integrated into a container or a prefabricated cabin, and fixed on a prefabricated strip foundation . 7. The outdoor prefabricated substation according to claim 6, characterized in that all the switchgears are installed in containers or prefabricated cabins, arranged in single or double rows, and wires are entered and exited by cables. 8. The outdoor prefabricated substation according to claim 6, characterized in that, the reactive power compensation module adopts a box-type capacitor and is fixed on a prefabricated strip foundation. 9. The outdoor prefabricated substation according to claim 6, wherein the arc-suppression coil module adopts a box-type arc-suppression coil complete set, and the box-type arc-suppression coil complete set combines the arc-suppression coil and its accessories The equipment is integrated into said container or prefabricated pod. 10. The outdoor prefabricated substation according to claim 1, characterized in that, the container and the prefabricated cabin adopt a cable access method, and the cable adopts a bottom access method, and the inlet is set at the container and the prefabricated cabin position near the end.