When United Illuminating looked to maintain reliability of electric service in southwestern Connecticut, it turned to Three Phase Line Construction. A planning study found that potentially low voltages and overloads could affect 115kV transmission equipment near Southington, Conn. To mitigate the issue, UI determined the need for putting in place, among other things, two 20-megavolt ampere reactive (MVAR) capacitor banks and a 7.5-ohm, 115kV series reactor on footprint of an existing substation. UI then hired Three Phase to relocate transmission lines connecting the new equipment and replace more than 10 miles of shield wires on the transmission lines by stringing it with optical ground wire (or OPGW).
To complete the project, Three Phase crews worked had to evaluate and adhere to construction methods that caused the least possible impact to the area below and around the transmission lines. This included stringing and sagging OPGW with helicopter crews. Three Phase completed the project on time, while also meeting UI’s safety and environmental requirements.
Construction began in March 2016
Construction completed in December 2016
February 17, 2016