Utility & Power

Additional Project Experience

Douglas Electric Cooperative, System Protection Study
Washington

ELCON performed a new System Protection Study in conjunction with the 2008-2011 Construction Work Plan. Recommended changes were developed to update the system, and enhance reliability and performance. Primary considerations for the 12.47kV distribution system included interrupting capacity, trip avoidance for cold load pickup and inrush currents, and trip selectivity between feeders.

Long Range Transmission System Planning Study
 WA

ELCON completed a 20-year planning study of the development of the district's 115kV transmission system. Existing loads were determined and future loads were estimated for four utilities serving Benton County. The planning criteria developed for this study included standards for reliability, voltage, thermal capacity, replacement of older equipment, flexibility for future development, single utility approach and transmission conductor size.

H.J. Ashe Substation 230kV Addition
OR

ELCON was responsible for adding a new 230kV bay 11 and a new PCB 11H to an existing substation that originally was built in 1976. It also included:

  • Adding a new PCB 4 H
  • Modifying existing alarm systems
  • Providing control & protection to bay 11
  • Replacing control and protection to bus tie position, AEC Midway and white bluffs lines
  • Replacing MWTT at White Bluffs line

Grays Harbor - Powell Road 115kV Transmission Line
WA

ELCON was responsible for completing a routing study and obtaining permits for the design of an 11-mile 115kV transmission circuit with distribution underbuild. The design addressed the need for a double circuit transmission line and H-frame construction. Soft soil footings for wetland areas, raptor guards, bird flight diverters and special aesthetic considerations were required. The project included preparation of the US Corps of Engineers Section 10 permit application, completion of the State Environmental Policy Act checklist and revision of the highway franchise to use public right of way.