Shunt Reactor Project
In 2011, VELCO installed three shunt reactors to the Vermont 345 kV transmission system, to control high-voltage during low demand situations and to improve the stability and efficiency of the energy transmission.
Needs & Benefits
Since 2005, VELCO has made significant improvements to the Vermont 345 kV transmission system as part of the Northwest Reliability Project and the Southern Loop Project. VELCO identified a need in the 2009 Vermont Long-Range Transmission Plan to add additional equipment to the system to control situations of high voltage. This equipment is called shunt reactors.
The Project will increase the system operator's ability to control high voltages at times when demand is low, as well as situations of equipment failure and system generator outages. This will improve the system's capability to meet present and forecasted demand during all conditions.
The following components were installed within the Vernon, Coolidge and New Haven substations:
- Coolidge substation
- Two variable shunt reactors
- 345 kV breaker and disconnect
- New Haven substation
- Replace existing fixed reactor with a new variable shunt reactor
- 345 kV breaker
- Vernon substation
- One fixed shunt reactor extracted from the New Haven substation
- Two 345 kV breaker and disconnect
VELCO's aesthetic consultant reviewed the preliminary design plans and performed a visual analysis of the areas of the proposed Project. The findings indicated there would be no adverse impacts at the Coolidge, New Haven, and Vernon substations.
- Coolidge Substation required a fence expansion approximately 60 feet to the north and to the south. The installation of the additional equipment will not be taller than the existing structures.
- New Haven subsation will not have a visual impact since VELCO will intall the equipment within the existing fence line, the new reactor is replacing the existing reactor, the equipment will be no taller than existing structures, and the Northwest Reliability project has provided the necessary screening.
- Vernon Substation will not have a visual impact because it will install the new substation equipment within the existing fence line, the equipment will be no taller than existing structures, and the Southern Loop Coolidge Connector project has provided the necessary screening.
VELCO's noise consultant assessed the potential noise impacts associated with the shunt reactors at all three sites. A comlete engineering noise analysis was provided as part of the Project's filing with the Public Service Board. VELCO projected no noise impacts to the closest residence at each substation.
- Winter/Spring 2011
- Public meetings
- Regulatory & permitting process
- Fall 2011
- Construction start
- Winter 2012
- Construction complete