It is well known that a model of any electrical circuit can be translated into a system of ordinary differential equations (ODE). Usually, the simulation is performed in the time-domain using classical discrete approaches convenient for both linear and non-linear systems. An other method consists in the quantization on the variable magnitude which is based on discrete events. The discrete event system specification (DEVS) formalism is adapted to simulate any electrical circuit described with a system of ordinary differential equations using the system state quantification (QSS). In this paper, a solution to make more efficient the magnitude quantification for a system of linear ordinary differential equations is given. The proposed technique is used to simulate a simple three phase coupled power systems and it is compared to other solutions given by the explicit in- tegration using formal language and the time-domain discretization using fixed-step 5th order Runge-Kutta integration method.