A model for computing the breaker reignition current following interruption of the charging current of long unloaded line

This paper presents a new model for the accurate calculation of the abnormal waveform of the breaker reignition current following the interruption of the capacitive charging current of a long unloaded overhead line section. The breaker is assumed located a some distance from the source. The suggested model is based on the circuit analysis of the cascaded cables and transmission line sections in terms of the ABCD constants using their distributed parameters, e.g. series inductance and shunt capacitance. The new model is verified using the results available in the literature obtained by applying the approximate, much more tedious and time consuming traveling wave approach. The model is applied to investigate the effect of the different parameters (such as the lengths and the surge impedances of the cable and overhead line) on the magnitudes and waveforms of the breaker reignition current.