Solid-insulated switchgear may not have been around for long, but it has gained widespread usage in recent years. This is primarily due to the new industrial and institutional buildings that are emerging, which, from a power supply and distribution perspective, are mostly medium to small in capacity, with distribution transformers generally not exceeding 1250 KVA. They ensure long-term stable power supply and infrequent operation of high-voltage switches. For such users, while the performance of solid-insulated switchgear is not perfect, it is sufficient to meet their needs. With the extensive urban construction and the rise of numerous large high-rise buildings, substation and transformer rooms are often located on the ground floor. According to fire safety requirements, transformer and substation equipment must be "oイルフリー" (oil-free), and, based on the rational use of construction area, they should also be "小型化" (miniaturized). This is where ring main units or vacuum circuit breakers, dry-type transformers, and dry-type current transformers come into play in various buildings. Ring main units feature simple structure, reliable and safe operation, minimal maintenance, and low operation costs, making them significantly superior to switchgear with circuit breakers. The demand for load switches with higher performance and smaller sizes has led to the emergence of new load switches, which in turn drives the technological advancement of solid-insulated switchgear. Today's solid-insulated switchgear not only offers excellent performance but also comes in a series, further expanding the range of applications for solid-insulated switchgear.
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