In the last years, several studies about network allocation considering cross-border exchanges in Europe and Asia have appeared. For example, in Europe, there is a need to find a robust and fair mechanism for Inter-Transmission System Operators (Inter-TSO) compensation in the European internal electricity market to replace the provisional European Transmission System Operators (ETSO) mechanism. One of the main challenges is that the system operator of each country does not have information about the electrical networks of other countries, making the application of any network cost allocation method difficult.

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The paper describes an expert system, named DiagRED, for the Electrical Distribution Network Steady State Diagnosis. Following the introduction, the 2 nd section presents the theoretical background regarding the applying of the Model Based Diagnosis (MBD) to the power systems steady state operation. Basic concepts and the MBD models for the discussed case are given. The 3 rd section presents the fuzzy indices for steady state operation diagnosis. Within the 4 th section, the DiagRED structure and its components are presented. Database, knowledge base and user interface are described. The main functors and rules implemented in the Prolog language are given. The 5 th section is focusing on presenting the case study, represented by a real 87 buses distribution network. Finally the conclusions of the paper are presented.