Applications of a new EMTP line model for short overhead lines and cables

This paper presents the applications of a new EMTP line model for the representation of short overhead transmission lines and cables. This line model overcomes the limitation of using a time step size not larger than the travel time. The interpolation errors inherent in this line model produce a filtering effect for higher frequencies. The new line is tested for two case studies. The first one is a case of transmission line energization. Simulation results for this case show that the new line model gives results for a short line which are close to the constant parameter line model results, while results with a pi-circuit show unrealistic high frequency oscillations. The new transmission line model is also tested for the case of a drive system, which involves power electronics devices. In this case, the new line model is used to represent a short cable and good results are obtained. The pi-circuit and the constant parameter line models would give unrealistic voltage waveforms. (C) 2002 Elsevier Science Ltd. All rights reserved.