Substation C/S Design

138kV Substation A-frame Analysis

SCOPE

ASEC’s client is rebuilding their existing 138kV transmission line and requested ASEC to analyze the existing substation dead-end structure to determine the maximum allowable pull-off tension capacity.

Project Description

Structure was modeled in PLS TOWER. Structure was also modeled in RISA 3D to analyze eccentric connections. Determined the maximum pull-off tension capacity of the structure for new conductor loads.

138kV Substation Relocation

Scope

Re-route of 2 overhead 138kV transmission lines and 7 overhead 69kV transmission lines through the multi-phase construction of the new 138kV substation.

Project Description

The construction of the overall substation was carried out in 20 smaller phases through various constraints. ASEC coordinated with transmission, substation, underground design and construction teams for the design to accommodate safe construction of the substation relocation.

Overhaul-Rebuild and Fiber Addition

SCOPE

ASEC is supporting our client with this 26-mile project that consists of 17 miles of overhaul-rebuild and an additional 9 miles of OPGW Fiber addition to the existing transmission line structures. The existing H-frame line is being converted to delta-monopoles.

Project Description

The rebuild structures are a combination of engineered concrete and steel poles. ASEC generated the loading tree calculations for these poles and reviewed the vendor calculations and fabrication drawings. The foundations have been designed by ASEC using a combination of direct-embedded with crushed rock and concrete backfills, and drilled pier shafts utilizing the anchor bolt cage design from the vendor. The geotechnical specifications were specified by ASEC and the soil parameters sifted from the boring reports while discussing foundation design concerns with the geotechnical engineer. Software used – PLS-CADD, FAD Tools, PLS-CAISSON