The modelling aspect of transmission line networks

Fault recognition on branched and meshed electrical transmission line networks can be simplified by comparing the measured digital reflectogram with a simulated one. The synthetic reflectogram is built up in the frequency domain, making use of models that describe attenuation and dispersion of a pulse propagating on a uniform transmission line. A new method to accurately model any line type in the frequency domain is considered. It is shown how the parameters of this model can be determined from noisy time-domain-reflectometer (TDR) measurements. An example application involving the RG58C/U coaxial cable shows the use of simulation in prefault detection