POWER SYSTEM TRANSIENTS CAUSED BY ARCING FAULTS

System transients caused by fault conditions are becoming of increasing importance in system protection and insulation. Accurate prediction of such transients requires a representation of all components in the system and the development of solutions for dealing with the resulting system equations. Of particular concern in such studies has been the representation of the arcing-fault condition and its integration into the assembled system equations. A suitable arcing-fault representation in system studies is proposed. Techniques are described for assembling the faulted-system equations into a format for solution. The solution method is by Fourier transform techniques with one form of the Duhamel integral incorporated to overcome voltage-current nonlinearity problems. A simple double-ended system is considered in which a transmission line is accurately represented. Representative studies directed towards high speed protection problems are presented.