Power network representations: calculations of per unit systems, voltage characteristics of loads, real and reactive power flow in simple systems, single line and impedance diagram of power system; load flow studies of large systems using the Gauss-Seidal methods; control of voltage, real power and reactive power, symmetrical fault calculation, limitations of short circuit current using reactors. Symmetrical components: positive, negative and zero sequence networks of generators, transformers and lines; sequence network of systems; unsymmetrical fault calculations. Power system stability: swing equation, power angle equation, equal area criteria of stability and its applications, solution of swing equation, factors affecting transient stability.