Description:

Tumbleweed Substation is a new 115 kV to 12.47 kV substation constructed to support Umatilla Electric Cooperative’s (UEC) transmission system in Oregon.  The station is comprised of a four-breaker 115 kV ring bus designed to support 200 MW of transmission, two 15 MVA power transformers, a 10-breaker 12.47 kV main and transfer bus, and includes a new control building.  Tumbleweed Substation is one of four current substation projects being completed for UEC.

Tasks performed include site layout, grading design, fence design, design of substation structures, bus & a switching configuration, bus design, ground grid design, design of lightning protection, equipment specification, auxiliary circuit design (ac and dc), dc load analysis & battery sizing, relaying diagrams, and project management.