Abstract:

This paper analyzes the causes of fuse blowout caused by lightning in a 35 kV substation, and proposes lightning protection measures such as adding lightning rod, replacing the grounding body, connecting the grounding body with the main grounding grid, and installing protective gaps in parallel. At the same time, the electromagnetic transient simulation software ATP-EMTP is used to simulate the grounding resistance and the lightning protection effect before and after the protection gap. The simulation results show that connection of the grounding body of the arrester  with the main grounding grid and the protective gap of the fuse can  effectively reduced, the lightning overvoltage amplitude.

Key words: substation, fuse, main grounding grid, protection gap, ATP-EMTP