Substation EquipmentTransformersCircuit BreakersDisconnecting SwitchesSubstation BusSurge ArrestersInsulators and ConductorsProtective RelaysFusesSubstation LocationAll power transmission lines must be isolated to avoid safety hazards. Large strings of insulators are used at substations and at other points along the power distribution system to isolate the current carrying conductors from their steel supports or any other ground mounted equipment. Insulators may be made of porcelain, rubber or a thermoplasticSee more on electrical-engineering-portal Wikipedia
Substation - Wikipedia
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Substations generally have switching, protection and control equipment, and transformers. In a large substation, circuit breakers are used to interrupt any short circuits or overload currents that may occur on the network. Smaller distribution stations may use recloser circuit breakers or fuses for protection of distribution circuits. Substations themselves do not usually have generators, although a power plant may
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