Vermont Electric Power Company proposes to upgrade the St. Albans Substation. The upgrade is needed because a recent conditions assessment revealed deficiencies within the substation. The upgrade will also require improvements and/or modifications to the St. Albans Tap Station and St. Albans Tap Line. The transmission system upgrade will improve the reliability of electric facilities serving portions of northwest Vermont.
Needs & Benefits
The VELCO St. Albans Substation is connected to VELCO’s electric transmission network in northwest Vermont. Green Mountain Power electric distribution systems are fed from VELCO’s transmission network, serving GMP customers. Originally built in 1958, the VELCO St. Albans Substation has not undergone major improvements or modifications, except for replacement of the power transformers. VELCO conducted a condition assessment of the entire substation and has identified the need to replace outdated equipment. For example, some critical components are at the end of their useful life. Improvements at the substation will also require improvements and/or modifications to the 115kV Tap Station and also to the 115kV Tap Line that connects the substation and tap station.
The project consists of the following components:
- Replace control building
- Replace two power transformers with single transformer
- Replace protection and control system
- Install instrument voltage transformers in support of new protection and control system
- Replace circuit switcher with 115 kV breaker
- Install steel box structure to support 34.5 kV equipment
- Expansion of substation fence
- Tap Station
- Install 115 kV steel switch stand and operated switch
- Install steel structure to facilitate tap line termination
- Install remote control equipment in control building
- Tap Line
- Remove three pole structure on west side of Tap Station
- Replace existing switch on structure with an X-brace
- Perform replacement of three structures on west side of substation
VELCO’s aesthetic consultant (T.J. Boyle Associates) reviewed the preliminary design plans and performed a visual analysis of the areas of the proposed Project. The findings indicate the Project will not create any adverse aesthetic impacts. A full analysis of potential aesthetic impacts and proposed landscaping to mitigate those impacts is included with the Certificate of Public Good petition filed with the Public Service Board. VELCO does not anticipate adverse aesthetic impacts from the Project.
VELCO’s noise consultant, Resource Systems Group Inc. (RSG) assessed the potential noise impacts associated with the substation relocation. A complete engineering noise analysis is included with the Certificate of Public Good petition filed with the Public Service Board. RSG has measured sounds levels at the existing substation and modeled the proposed modifications. The findings indicate the Project will not create any adverse noise impacts. VELCO expects no noise impacts to the closest residence at the Substation.