Abstract The development of microcomputers has resulted in numerous applications in the areas of power system protection, control, and data acquisition. Micros are currently being used for communications processors in remote terminal units and in sequence of events recorders. They provide a degree of “intelligence” and flexibility previously unknown. Future applications include their use as dedicated control modules in substation automation schemes and as replacements for traditional protective relays. The combined advantages of low cost and high performance will result in widespread use in power system applications.