A New Method for the Computation of Faults on Transmission Lines

A systematic matrix method for modeling short-circuits and interruptions on transmission lines is presented. The method fits perfectly into the calculation method for short-circuits on network buses with the nodal admittance equations, which are also presented here. All types of balanced or unbalanced faults, both in single and multiple constellations are treated systematically with the same method. Each fault is modeled in the phase domain by a characteristic 3times3 incidence matrix, the so called fault matrix. The modeling of faults on lines is carried out in a way, that only the elements of the line admittance matrices are changed, but not their structure or order. Subsequently, when the line model is inserted into the nodal admittance matrix of the network, the order and structure of this matrix is also kept unchanged. Thus, no additional nodes are required for modeling interruptions, as it is the case in the classical methods