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The mysql extension is deprecated and will be removed in the future. The earth ground wire must be capable of conducting the current to blow the 15a fast blow fuse or breaker in the event of an inte rnal short circuit. Line current differential protection and automation system use the sel311l line current differential relay with integral fourzone distance backup for easytoapply, highspeed line protection. Ge industrial systems addendum this addendum contains information that relates to the n60 network stability and synchrophasor measurement system relay, version 4. In both cases indar offers a wide range of powers, speeds, voltages, cooling systems and constructions. Joseph distefano schaum theory and problems of feedback and control systems xue linear feedback control analysis and design with matlab kundur power system stability and control.