The generalized remote operation of protective relay refers to all the business operation orders involving operational mode changes and operating maintenance arising from an external substation or an internal one. Such remote operation should follow a strict business control with high cyber security guarantee

which is an urgent engineering task demanding prompt solution. A closed-loop business supervising and control mechanism is proposed with the remote operation order sheet(ROS)uniformly signed and issued by the dispatch control center and uniquely executed by a novel secure operation module for protective relay(SOMR)in substation. The encrypted and extensive markup language formatted ROS will be prepared in safe zone Ⅲ at the dispatch control center

and transferred to SOMR in IEC 61850 file mode

through a uniform ROS platform in safe zone Ⅰ at the dispatch and control center. SOMR will execute ROS to target protective relays

to fulfill the orders such as protection setting

setting operation zone change

soft strap turn on or off

signal return

setting periodic verification

etc. plus the authorized site operations auto-monitoring and trace recording. The ROS modeling

and its digital signature and encryption selection

are also presented. Finally

the advantages and necessity of the proposed scheme are demonstrated. This work is supported by National Natural Science Foundation of China(No. 51677047).