Abstract: Aiming at the requirement of rates watt-hour data uploading for gate energy remote terminal, it is necessary to extend the design of terminal software that the reading, local saving and uploading of rate electric energy need be realized. Because of the large capacity of minute power curve and the low access efficiency of embedded terminal electronic disk, information compression and the vertical and horizontal two-level structure are adopted to store files by day in order to locate and access information quickly and improve the performance of information processing. Considering the strictness of terminal processing information, multiple means are adopted to realize the integrity and traceability. At last, IEC 60870-5-102 protocol is extended for rates watt-hour data transmission, and these data are uploaded to master station of power billing system. This software is tested and verified in laboratory and substation field, all functions and performance indicators meet the requirements, and the software extension has achieved expected goal.

Key words: electrical energy remote terminal unit, multifunction watt-hour meter, rates electricity, minute watt-hour curve