Product performance and qualification requirements

1.The prefabricated cabin shall ensure sufficient mechanical strength and rigidity. It will not be deformed or damaged during lifting, transportation and installation, and will not affect the equipment in the cabin due to lifting and transportation; Have good seismic performance and wind resistance)

2.The overall protection level of the prefabricated cabin is not lower than IP43, and it has the effects of dust prevention, moisture prevention and condensation prevention; The interior of the cabin is strictly divided into compartments by steel plates and flame-retardant insulating partitions, and the protection level between compartments is IP40.

3.The prefabricated cabin shall have good anticorrosion performance, so as to ensure that the cabin will not rust within 20 years, and other accessories of the cabin shall reach the same service life level.

Technical characteristics

Prefabricated cabin has created a brand-new construction mode of "standardized design, factory processing of prefabricated cabin manufacturers and assembly construction" for substation. New construction mode: reduce the floor space, save environmental resources, reduce the cost of capital construction, and effectively shorten the construction and commissioning cycle of smart substation to achieve rapid station construction; New construction technology: modular design, convenient disassembly and assembly; The equipment can be quickly replaced, it is easy to establish a maintenance component library, and the spare interval investment is reduced; Universal process, simplified assembly, energy saving and environmental protection, improved on-site construction efficiency, and ensured the safety and quality level of project implementation; New automation technology: It improves the overall intelligence level of the substation, improves the safety and reliability of the substation, further highlights the positioning of the industrial facilities of the substation, and lays a solid foundation for the green and healthy development of the smart grid.

Basic definition of modular quadratic combination

The secondary combination equipment of prefabricated cabin consists of prefabricated cabin, secondary equipment cabinet and secondary equipment. The whole set of secondary equipment is integrated by the prefabricated cabin manufacturer, and the related wiring between panels and cabinets is completed in the prefabricated cabin manufacturer, and it is transported to the engineering site as a whole to realize the docking with primary equipment and civil works on site. Prefabricated cabin combined secondary equipment is generally modularized according to the characteristics of secondary system and the primary object of service.

Advantages of modular secondary combination

Modular secondary combination realizes standardized design, factory processing and assembly construction. The main components of buildings and structures are prefabricated in the factory, modular secondary combined equipment is adopted, and universal design and equipment are applied to realize plug-and-play of primary and secondary equipment; Civil buildings and structures, electrical primary equipment and secondary equipment fully realize the intelligent substation prefabricated in the prefabricated cabin factory.

Its advantages are mainly manifested in the following aspects

(1) Compared with the secondary equipment room, it reduces the building area and occupied area, realizes environmental protection, saves many installation links in the construction process, and reduces link pollution.

(2) The integrated installation and wiring of the secondary equipment in the factory will help to integrate the functions of the secondary equipment, improve the concentration and integration of the equipment, effectively save the equipment and reduce the on-site workload, and meet the technical requirements of "resource-saving".

(3) The joint debugging mode of prefabricated modular secondary equipment has also been changed, and the joint debugging mode of prefabricated modular factory+field debugging mode has been used. Simulate the operation of the design in the workshop of the prefabricated cabin manufacturer, and complete the solidification of SCD files of equipment such as the five-prevention logic of the whole station and the naming of signal point table, and only need to carry out transmission verification with this equipment on site.

(4) The secondary design is simplified, and a complete virtual terminal point table can be generated after the workshop commissioning is completed, which can be attached to the design documents according to the different requirements of local dispatching.

(5) save money. The secondary body is arranged in the power distribution interval on the spot, which reduces the length of the secondary optical cable and cable, saves materials and reduces the manufacturing cost.

(6) Change the construction process, change the current serial construction mode into parallel construction mode, and save more than 60 percent of the on-site debugging period.

Present situation of secondary system in intelligent substation

At present, during the construction of smart substations, secondary equipment is installed and debugged at the construction site of prefabricated cabin manufacturers, which mainly has the following problems.

(1)Limited by the construction process, the construction period is long. The installation of the secondary cabinet can only be carried out after the end of civil construction; The optical/cable connection with the secondary system can only be carried out after the installation of the cabinet. This makes the installation and debugging of the secondary system subject to the construction and installation time and progress of civil works and primary equipment.

(2)The workload on site is large and the efficiency is not high. There are quite a few debugging projects of smart substations, and the technology is complex, which requires the after-sales personnel of manufacturers to participate in the construction debugging on the spot. This method is inefficient, and it is often difficult for manufacturers and debugging units to respond effectively after the smart substations are fully promoted in the power grid.

(3)The site construction environment is not good, and there are certain hidden dangers. A large number of optical port connections are used in smart substations, but the construction environment in the project site is not good, there is a lot of dust, and the optical port of secondary equipment can not be effectively protected, which brings hidden dangers to the performance and life of the optical port in the later stage.

(4)It is necessary to set up an independent secondary chamber, which leads to an increase in floor space. Conventional secondary equipment needs to set up an independent control room, which takes up land resources, that is, increasing the amount of civil construction is not conducive to the saving of land resources.

Concluding remarks

Compared with the conventional substation, the prefabricated modular secondary equipment of prefabricated cabin manufacturers can effectively reduce the building area. The prefabricated modular secondary equipment uses the method of factory processing and on-site hoisting, which saves many links such as structure, masonry, decoration and electrical installation during building construction, and effectively reduces environmental pollution. At the same time, it can reduce dust pollution, provide a good working link for the secondary equipment in the cabin, and effectively ensure the safety and reliability of the equipment. At the same time, the traditional serial construction mode is changed into parallel construction mode because of improving the reduction process, which can effectively improve the efficiency of design and construction, effectively shorten the construction period, and at the same time greatly reduce the on-site debugging projects of secondary equipment. Because the prefabricated cabin is assembled with environmentally-friendly integrated materials, it is arranged in the distribution interval on the spot, which can effectively reduce the length of secondary light/cable and reduce the project cost.