The lightning phenomenon is a natural disaster that endangers human life. The nature of grabbing objects closest to the cloud can cause fires, damage to electrical equipment, and even fatalities. The Padang Institute of Technology is a campus that has tall buildings, such as buildings B, C, D, E, and F, without an adequate lightning protection system. This is certainly a concern regarding security and safety for building users on the ITP campus. This research was conducted to reduce the risk of being hit by a lightning strike on the ITP campus. The protection system design process refers to the IEC 62305-3 standard comparing the protection angle and rolling sphere methods. Meanwhile, the procedure for calculating building requirements for a protection system or building protection level refers to the PUIPP and IEC 1024-1-1 standards. After analyzing the lightning rods in 5 ITP campus buildings by comparing the protection angle and rolling sphere methods, it can be concluded that there are still parts of the building that are not protected by the size of the installed air terminal. To overcome this, adding or adjusting the air terminal level is necessary so that all buildings are in the protection area. In addition, in conducting the analysis, the method considered the best to provide clear information on the part of the building that needs protection and the amount of the building that has been protected is the Rolling sphere method.

The 150 kV Koto Panjang – Payakumbuh transmission line has a line length of 86 km with 249 towers, and the occurrence of the back-flashover in their transmission line is 74%, indicated by the high tower footing resistance as that is >3 ohms. The type of rock on the transmission line and the location of the towers, 79% in hilly or mountainous terrains, are among the factors that can cause an increase in the resistance value. The results of this study indicate that the level of back-flashover affects the value of the tower footing resistance by considering the number of electrode installations. When the towers were installed with more electrodes, the value of tower footing resistance, back-flashover level, and insulator voltage could be reduced to less than half of the previous ones. Moreover, the occurrence of the back-flashover rate in each tower can be dropped to ≤ 1 back-flashover rate of 100-km/year. Each tower's soil resistivity value has grown, yet fewer back-flashover disruptions exist. The span's length causes this, as the shorter the span, the faster the reflected wave will travel. As a result, it can lower the voltage in the insulator and diminish the likelihood that a flashover would occur.