Control communications and protection for the El Chocon-Buenos Aires 500 kV transmission system

The paper describes some of the main design objectives, the design features required to achieve these objectives and the appropriate operating experience associated with the communications, protection and automatic switching control for the Chocon 500 kV network. In particular, the paper highlights control measures necessary for a long e.h.v. transmission network subjected to wide variation in power transfer with upper limits approaching the steady-state stability limit.