This document discusses automation techniques for transmission lines, including differential protection, fault location, autoreclosing, and hardware implementation. Key points include: - Differential protection compares current waveforms between line ends using fiber optics and GPS for high-speed fault detection. - Microprocessors allow integrated protection and automation functions like fault location and autoreclosing without additional hardware. - Autoreclosing algorithms determine breaker closing sequences and attempts based on variables and logic functions. - Fault location algorithms calculate distance to faults based on line measurements and models while accounting for measurement errors.