"Expansion of the 110 kV switchgear for two cells of the Atyrau 220 substation for connecting the 110 kV double-circuit overhead power line "Uzlovaya - Atyrau 220" Expansion of the 220 kV Atyrau substation, design of the 220/10 kV A-NPS3A and A-NPS-4 substations Section: Secondary connections and relay protection and automation of 110 kV overhead power line cells. Substation control and automation. Project. Working documentation