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The analysis method and results of a power network connectivity determination algorithm, part of the CONCE project, the central part of ENHER's computerized dispatching system, are reported together with a validation of the latter through practical measurements. The algorithm is constructed by repeated invocation of the same connectivity determination procedure for an abstract graph. Although emphasis is given to a version consisting of two steps, substation and overall network, a three step imiplementation is also suggested together with its possible advantages. The main concepts upon which the algorithm is based are reviewed briefly. The analysis shows that the processor time involved in its execution is linearly proportional to the power network dimensions. This fact suggests that the algorithm could be used with advantage for large power networks.