Abstract:There are two kinds of problems of telecontrol operation and maintenance. On the one hand, debugging work of infrastructure station can only be passively waited if the telecontrol channel has not yet been opened. On the other hand, when the telecontrol information abnormal analysis is carried out at the running station, it is necessary for another people to cooperate with data view, and its operation and maintenance efficiency is relatively low. The paper analyzed the practical problems of telecontrol operation and maintenance and proposed a portable device for power substation telecontrol information debugging based on technical standard of the China southern power grid. The device can not only simulate dispatching automation system, but also monitor and translate the IEC 104 telecontrol protocol message on line. The device has been applied in the 220 kV Yuezhao and 110 kV Hecheng power substation of Guizhou power grid to verify the telemetry and remote control simulation functions. The result shows that the portable device can improve the work efficiency of telecontrol information debugging for power substation.