With social and economic development, the assembled substation has been widely popularized and applied in power systems everywhere. The substation adopts modular construction, which has standardized design, modular combination, factory processing and intensive construction. Compared with traditional substations, Modular substations can effectively reduce the floor area, building area, construction period and other indicators.
Modular substation is built to meet the increasing power load of society but also to enhance the power supply capacity of the grid.
Modular substation adopts full prefabricated structure building model, through factory production prefabricated, on-site assembly and installation two major stages of building substations.
This construction method dramatically reduces the floor area of the substation and dramatically reduces the construction period.
With the successful pilot of the assembly substation, many modular products for substation construction appeared on the market, such as: SVG Equipment Container, Modular substation will become the mainstream model of substation construction in the future.
1 Development Of Modular Substation
With the progressive progress of resource-saving and environment-friendly design and construction, the substation construction model must move towards a development model that reduces land occupation, reduces substation cost, shortens the construction cycle, coordinates with the surrounding environment, improves operation reliability and reduces equipment maintenance.
At the same time, the development of technology in related industries has also promoted the development of the substation construction model.
The emergence of closed high-voltage combined capacitors realizes the modularization of high voltage equipment;
The emergence of plug-in cable accessories realizes the prefabrication of the project and shortens the construction and test cycle on-site;
Electronic technology and monolithic technology significantly reduce the size of the integrated automation device, and the distributed intelligent device realizes the factory prefabricated integrated automation module;
2 Features Of Modular Substation
The modular substation design process is a continuous improvement. The optimization process should be in advance in the project implementation process to explore the progress, optimization and improvement of conventional engineering practices and to implement every link of the whole process of the project.
Problems and improvement measures found in the implementation process should be timely feedback to modify the design and construction typical process in time.
Modular substation modular construction mainly consists of civil and electrical parts.
The civil engineering part includes foundation, cable trench and fence, integrated building and auxiliary module, electrical mainly includes line module, main transformer module, automation module reactive power compensation and arc suppression coil module.
Whether it is civil and electrical, the modular construction of preassembled substation mainly has the following characteristics:
(1) Standardized design: According to the general structure of the national grid, the use of available equipment, electrical equipment type, circuit wiring and civil design standardization can be achieved. Standardized connection of primary and secondary equipment, can plug and play secondary wiring; realize unified information acquisition, comprehensive analysis, intelligent alarm, on-demand transmission, realize sequence control and other advanced application functions modularization, standardization and customization.
(2) factory processing: building (structure) building accessories to factory processing, factory prefabricated structure type.
After excavation, civil foundation pit can be hoisted to the specified position on the site, and then quickly backfill the foundation pit to reduce a series of problems after excavation site construction time;
protection, communication, monitoring and other secondary equipment according to the electrical function unit using “prefabricated cabin combined secondary equipment,” cabin wiring and The commissioning of monomer equipment is completed in the factory; one or two integrated equipment to maximize the scale production and integration in the project Commissioning, easy installation, shorten the construction period.
(3) prefabricated construction: building frame beams, columns and maintenance structures are made of factory modular production, on-site assembly welding, reduce the site “wet work” to achieve environmental protection construction.
Improve construction efficiency, reduce construction cycle, improve efficiency more than three times more than wet operation, and not affected by weather and climate, less labour intensity, convenient and orderly cross operation, acceptable assembly construction noise is slight, fewer bulk materials, less wastewater waste discharge, in line with the requirements of the State Grid “two-type integration.”
(4) the specificity of the equipment: prefabricated substation has its unique construction characteristics, used in the construction of a lot of new technologies, compared with ordinary substations. Standard distribution substation is very different, is the application of prefabricated cabin type combination equipment, its cabin will be assembled Box structure type to the application over, transport more convenient. The installation and integration of the second combination of equipment have been completed in the factory.
After the overall commissioning in the factory, it is transported to the site without changing in the middle and can be put down on the location of the power distribution device.
The application and promotion of Modular substations have brought the technological innovation system and industrial production methods to a new level.
Many substations today are adopting a modular design approach. Practice studies have proven that modularization has a series of advantages over traditional substations.
Modularization has its characteristics and advantages, which can effectively reduce the floor area and building area, shorten the construction period, realize the standardized design and distribution construction of an intelligent substation, and accumulate experience for the subsequent construction of Modular substation.