Security isolation and protection facility for in-station cables of substation

The utility model discloses a security isolation and protection facility for in-station cables of a substation. The protection facility comprises two semi-circular casing pipes which are combined in an abutting mode, a first sliding block and a first sliding groove are respectively arranged at two edges of the first casing pipe in the axial direction of the first casing pipe, a second sliding block and a second sliding groove are arranged at two edges of the second casing pipe in the axial direction of the second casing pipe, the first sliding block is embedded into the second sliding groove and can slide in the axial direction of the casing pipes, and the second sliding block is embedded into the first sliding groove and can slide in the axial direction of the casing pipes. The security isolation and protection facility for the in-station cables of the substation can be installed in the later period, the operation safety and the working efficiency are improved, and by means of the security isolation and prot