Security Evaluation of PCM Equipments in Power Systems Based on Bayesian Network

In power communication systems, the pulse code modulation (PCM) equipment plays an important role. Its security has been a focus of attention, when the concept of cyber physical system is proposed. In order to solve the security problem of PCM equipments, a Bayesian Network (BN) model is used in this paper. By analyzing the vulnerabilities of PCM equipments, the BN model can be established to evaluate the security of PCM equipments rationally. For illustration, four PCM equipments are selected from some substations. They are utilized to show the feasibility of the BN model in evaluating the security of PCM equipments. Empirical results show that some effective counter measures can be found to help decision maker improve the security of PCM equipments. The BN model can effectively evaluate the security of PCM equipments, the most reasonable and effective countermeasures are advanced.