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An Electrical Substation is a key node in the power system, mainly responsible for voltage transformation, power distribution, and control. It serves as a central hub for delivering electricity from the generation side to end users. Through equipment like transformers, switchgear, and protection devices, the substation converts high-voltage electricity into levels suitable for transmission or usage, ensuring the safety, stability, and efficiency of the power grid. It is widely used in urban power distribution, industrial zones, infrastructure projects, and renewable energy systems—making it an essential facility for modern electricity supply.

An Oil Immersed Transformer is a type of power transformer that uses insulating oil for both cooling and insulation. It is widely used in power systems to step up or step down voltage. The windings and core of the transformer are fully submerged in special transformer oil, which ensures safety and stability during long-term operation thanks to its excellent insulating and heat dissipation properties. Oil immersed transformers are commonly applied in power transmission projects, industrial and mining enterprises, commercial buildings, and rural power grid upgrades. They are indispensable core equipment in power transmission.

A Ring Main Unit (RMU) is a critical piece of switchgear equipment used in medium-voltage power distribution networks. In transformer applications, RMUs serve as the first line of defense by providing essential functions such as fault isolation, load management, and protection for transformers.

The conservator is an oil storage device used in the transformer. Its function is to expand the oil in the oil tank when the oil temperature rises due to the increase of the load of the transformer.