Prefabricated substations are the main direction for current rural power grid renovation and future substation construction. However, they still have some shortcomings, specifically:
(1) Fire prevention: Prefabricated substations are generally fully sealed and unattended. Although all equipment operates without oil and is equipped with a remote smoke alarm system, fire hazards still exist inside the prefabricated unit, such as cables and compensation capacitors. In the event of a fire, ventilation and fire suppression are difficult. Therefore, an automatic fire extinguishing system should be considered, but this would increase the manufacturing cost of the prefabricated substation.
(2) Expansion: Due to limitations in size and manufacturing cost, prefabricated substations have limited expansion margin for outgoing line bays. Adding 1-2 more outgoing line bays to the existing prefabricated unit is difficult; additional prefabricated units are required.
(3) Maintenance Issues: Due to manufacturing cost considerations and limited enclosure size, prefabricated substations have relatively small maintenance space, hindering equipment maintenance, especially emergency repairs. This is an inherent and insurmountable drawback of prefabricated substations.
In conclusion, looking to the future, prefabricated substations will be widely used in cities, rural areas, industrial and mining enterprises, and public buildings across my country. Their cost-effectiveness will lead to increased adoption, further elevating the operational level of my country's power grid.
