Abstract
Transmission line arresters with a series air gap have been installed to protect an overhead power transmission line from a back flashover caused by lightning. It has been required to develop an accurate model of the transmission line arrester together with an arcing horn which can deal with multiple flashovers for an analysis of a transient behavior of the arrester.
The paper proposes a new flashover model of the arcing horn represented by a nonlinear inductance, a nonlinear resistance and two switches. The transmission line arrester with a series air gap is modeled by a composite circuit of the above arcing horn model and a nonlinear resistance. The calculated results of the flashover voltage and predischarge current waveforms by the proposed model are compared with actual measurements, and the accuracy of the model has confirmed to be satisfactory. The model is expected to be useful to analyze multiple flashovers of an arcing horn and an operational characteristic of a transmission line arrester.
