Safety Analysis of Secondary Cable in Substation during Power Frequency Short Circuit

Abstract

In order to study the safy of secondary cables in substation, the influences of soil resistivity, short circuit current, distance, grounding grid parameters and cable parameter on the core-to-sheath potential difference and shielding layer current are investigated. It is shown that the core-to-sheath potential difference and shielding layer current change little with soil resistivity, and increase linearly with the increase of short-circuit current, and decrease with the increase of distance. The core-to-sheath potential difference increases with the increase of side length of grounding grid and cable length.