The invention discloses a substation
remote terminal unit device based on double-CPU redundancy configuration, which comprises a first CPU plug-in, a second CPU plug-in, an input plug-in, an output plug-in, a
direct current analog quantity plug-in and a GPS receiving plug-in which are all connected with a controller
local area network bus, the first CPU plug-in and the second CPU plug-in are connected with a man-
machine interface plug-in, and the first CPU plug-in and the second CPU plug-in are connected with a power supply plug-in. The main CPU plug-in controls and outputs a final result, the first CPU plug-in and the second CPU plug-in work in a main state and a standby state, the main CPU and the dispatching
master station exchange data and complete execution of a control command, the standby CPU and the dispatching
master station keep communication connection, the first CPU plug-in and the second CPU plug-in independently communicate with third-party IED equipment and
complete data forwarding, and the third-party IED equipment is in communication connection with the standby CPU. And the control command is issued to the third-party IED equipment through the main CPU plug-in. According to the invention, the situation that the whole-
station information acquisition and
control function is lacked due to the fault of a single CPU plug-in is effectively avoided, the availability and stability of the RTU
system are improved, and the power-off maintenance time of field operation and maintenance is effectively reduced.