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power system symmetrical components transmission lines transmission per unit representation power system stability plant power power system analysisper unit calculations psa unsymmetrical faults uniformly loaded dc distribution short lines unit v medium lines long lines design tension sag insulators capacitance dc problems distribution ac load factor contribution curve improvement pf unit ii solved examples synchronous generator unit i symmetrical fault analysis circuit breaker fault mva equal area criteria power system stability limit. critical clearing angle faults on power system unloaded and loaded generator and power system unbalanced system per unit values non-conventional energy sources renewable energy sources sustainable energy power generation non-renewable conventional energy sources pu transposition unsymmetrical spacing symmetrical spacing transmission line parameters calculation inductance calculation introduction thermal steam power plant gtd conventional plant conventional