January 15, 2017

MEC Power Group Installs 345kV Structure at Mystic Generating Station

MEC Power Group, the high-voltage division of McDonald Electrical, furnished and installed a two-pole H-frame structure at Mystic Generating Station to increase the ground clearance of an existing 345kV transmission line. Two 85-ft steel poles with base plates were set on concrete spread footings, with a 43-ft long W-beam cross-arm to support the existing 795 ACSR conductors and shield wires. Existing transformer taps were extended to accommodate the increased cable height. Work required the use of two (2) 100-ft manlifts, a 90-ton crane to raise the poles, and a 60-ton crane to place the cross-arm. Work was completed during a 3-day power outage of Mystic 7 diesel turbine.

MEC Power Group’s crew of six IBEW electricians, supervised by division Director Chris Lombardi, performed installations on the fast-track project in only three days in constricted work space at the fully operational power station.

The NECA contractor teamed with electrical engineering firm, Stantec of Boston, MA and facility owner Exelon Generation, LLC.

See article in High-Profile, February 21, 2017