[M-IS27] Atmospheric electricity: Applications toward natural disaster mitigation

[MIS27-05] The Effect of Lightning Phenomena on Lightning Protection for Objects on the Ground

★Invited Papers

*Yokoyama Shigeru¹ (1.Shizuoka University)

Keywords:Lightning, Lightning Protection, Power Grid, Wind Power

When lightning strikes the transmission line or the distribution line, high voltage is generated between the wire and the earth, discharge occurs in the insulator, and power failure occurs. A high voltage is generated when the peak value of the lightning current is large. Also, as the wave front length of the current is shorter, a higher voltage is generated. On the other hand, the lightning rod fails to catch the lightning discharge and destroys the roof and wall of the building even with the low peak value of the lightning current. Furthermore, damage caused by lightning arrester burnout is not much affected by the length of wave front length, and it is greatly influenced by the duration (charge amount) of the lightning current. Table 1 shows the relationship between the types of lightning damage and lightning parameters. Since lightning properties related to lightning damage of ground structures depend upon the object, it is important to fully understand the lightning phenomena to take countermeasures against lightning damages. Moreover, it is also necessary to clarify the seasonal and local characteristics of lightning from the viewpoint of risk management because there are lightning with significantly different properties from ordinary summer lightning such as the Japanese winter lightning. In this paper I will explain the lightning properties necessary for countermeasures against lightning damage and consider the issues of lightning observations in the future.