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This study describes a method to prepare operational planning of a power system using the measurements of bus variables. For this purpose, voltage and current phasors of a target bus have to be measured for two consecutive time instances. These measurements are then used to determine the Thevenin's equivalent voltage and impedance of the system. The Thevenin's equivalent voltage, impedance and bus voltage of the target bus are used to derive sensitivity relations for change in real and reactive powers with respect to change in the bus voltage of the target bus. The sensitivity relations are utilised in the decision-making process, during operational planning of a power system. Nomenclature P kinjected active power at kth bus Q k injected reactive power at kth bus P k (t) measured value of injected active power at kth bus at time t Q k (t) measured value of injected reactive power at kth bus at time t P Dk active power demand at kth bus Q Dk reactive power demand at kth bus P Gk active power generated by kth generator Q Gk reactive power generated by kth generator P GT total real power generation P DT total real power demand P LOSS total real power loss Q GT total reactive power generation Q DT total reactive power demand Q LOSS total reactive power loss V k = e k + jf k voltage at kth bus V min k minimum allowable bus voltage at kth bus (0.95 pu) cos φ k (t) load power factor of kth load bus at time instance t

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