FIELD: electrical engineering. SUBSTANCE: effect of coordinated action of protection devices of power lines, substations and their automatic gears is achieved thanks to additional switching on of relays of acceleration of protection of power lines supplied from contacts of relays of control of protections of lines and substations connected in series and reclosed manually. Prohibition of automatic reclosure of lines from devices of substations is carried out with delay exceeding difference of times of automatic reclosure of switches on ends on supply line with allowance for acceleration of their protections. EFFECT: improved efficiency and reliability of protection. 2 dwg
