With the purpose of entering the regime parameters into the range of admissible values, in the static analysis of electric power systems security a simplified procedure for selecting control actions is considered. The calculation procedure is divided into two stages - calculating the steady-state regime (constraints of the «equality» type) and introducing the electric mode into the range of admissible values (constraints-inequalities). The mathematical model of the second stage is based on the analysis of the voltages of the two nodes - with the maximum and minimum relative values ??of the stress modules. The model is acceptable both for partial limitation and for increase (correction of excessively disconnected at the intermediate iteration) load. Test calculations confirm the effectiveness of the proposed mathematical method.