Effect of surge protective devices at adjacent poles on faults at lightning striking pole on actual distribution line

Inhalt:
For the efficient lightning protection design of the overhead power distribution line (OPDL), we discuss the effect on the lightning outages at the struck pole by the installation of the surge protection device (SPD) at adjacent poles on the actual OPDL based on the lightning current peaks estimated by the Japanese lightning detection network (JLDN). In the sparkover faults, the lightning current peak is high when the SPD with zinc oxide (ZnO) element is installed at the adjacent poles due to the mitigation effect. In contrast, the lightning current peak are unexpectedly low when the SPDs are installed at the adjacent poles in the SPD burnout faults (SPDBF) at the struck pole. The numerical simulation results by the expandable transient analysis program (XTAP) qualitatively agree with the observed results.