Fault isolation via components simulation

The problem of deducing the internal component parameters from external measurements of a large-scale system is studied in the context of the fault isolation problem. By assuming an appropriate algebraic connection model matrix, algebraic necessary and sufficient conditions for the exact determination of the internal component parameters are obtained for both the single-test frequency and multiple-test frequency cases. In both cases the linear independence of the rows or columns of certain matrices may be used to determine appropriate test points and test frequencies.