Signal Analysis of Simulated and Measured Earth Faults on Compensated Distribution Network for Future Development of Fault Locating Methods

This paper deals with the subband coding (wavelet multiresolution analysis) signal processing tool on corrected PSCAD/EMTDC simulations and some results of a full scale earth fault experiment carried out on the Petersen-Coil compensated 10 kV research/laboratory distribution network at Kyndbyvaerket, Denmark. The PSCAD/EMTDC simulation model is equivalent to the research/laboratory network at Kyndbyvaerket, build on 25 corrected cable models and 4 line models in a radial network of approximately 7.4 km length connected to four distribution transformers. The purpose is to show that the transient sequence of currents and voltages not exceed a bandwidth of approximately 10 kHz, for which signal measurements on conventional current transformers (CT's) and voltage transformers (VT's) is sufficient. Further analysis with the Prony signal processing tool will show the connexion of the earth fault transients and the Prony estimated exponential damped sinusoids.