Time-domain model for multiconductor power transmission lines

The paper presents a new form of time-domain transmission-line model based on natural modes of oscillation as an alternative to models based on natural modes of wave propagation. The advantage is that a prototype model formed in the frequency domain using the new method can be easily transformed into the time domain for EMTP implementation without the need for numerical convolution of any sort. The proposed transmission-line model is an adaptation of the transformer model proposed by the authors. The structure of the new model, and the analytical procedures required to generate a time-domain version, are clarified in the paper in relation to the modelling of an illustrative 3-phase line.