Substation telecontrol signal outage resetting device and system

The invention discloses a substation telecontrol signal outage resetting device and system. An output loop of a relay JDQ is used for being connected in series with a main power supply loop of a resetdevice on a substation site through two empty nodes of each group of signal ends; the output loop of the relay JDQ is configured to be normally closed; an input loop of the relay JDQ is configured tobe controlled by a driving circuit; a controller receives the time interval between the opening action and the closing action in the reset control data; a first control signal corresponding to a first moment T1 and sent to the driving circuit and a second control signal corresponding to a first moment T2 and sent to the driving circuit are generated according to the time interval between the opening action and the closing action; the driving circuit controls the input loop of the relay JDQ to be powered on after receiving the first control signal, and controls the input loop of the relay JDQto be powered off after rec