Vermont Electric Power Company proposes to upgrade the Irasburg Substation. The upgrade is needed because a recent conditions assessment revealed deficiencies within the substation. The transmission system upgrade will improve reliability of electric facilities serving portions of northwest Vermont.
Needs & Benefits
The original VELCO Irasburg Substation was built in 1973, with various modifications and improvements occurring over the nearly 50 years. VELCO conducted a conditions assessment of the substation and idenfitied the need to replace some of the equipment due to condition. Deficiences were identified in a piece of 115kV equipment (390 circuit switcher), and it was determined that the 390 circuit switcher needs to be upgraded to to a circuit breaker to allow for 115kV transformer faults to be cleared and maintain 115kV continuity.
No expansion of the substation yard or fence is necessary for the Project. Room exists within the existing substation yard to remove the existing 390 cirucit switcher and install the new K390 circuit breaker and associated equipment.
A temporary capacitor bank will be installed inside the Irasburg substation yard to support the 46kV system during the Project.
While the Project is being constructed, VELCO will take the opportunity to perform regular condition-based maintenance and in kind replacements at the Irasburg substation, not associated witht he Project, including but not limited to, the replacement of obsolete yard and protection and control equipment, repalcement of the back-up generator, and repairs to the control building.
The project consists of the following components:
- Retire and remove the existing 390 circuit switcher.
- Install new K390 circuit breaker.
- Install new foundation for the K390 circuit breaker.
- Install new 115kV disconnect for the K390 circuit breaker.
- Remove external current transformers from the H39 transformer primary bushings.
- Install new protective relays and control system associated with the new K390 circuit breaker.
- Install temporary 5.4MVar capacitor bank to support 46kV voltage.
VELCO's aesthetic consultant (T.J. Boyle Associates) reviewed the preliminary design plans and performed a preliminary visual analysis of the proposed Project upgrades. The findings indicate that the Project will not create any adverse aethetics impacts. A full analysis of potential aesthetic impacts will be included with the Petition filed with the Public Utility Commission. VELCO does not anticipate adverse aesthetic impacts from the Project.
VELCO's noise consultant, Resource Systems Group, Inc. (RSG), will assess the potential noise impacts associated with the Project. A complete engineering noise analysis will be provided as part of the Project's filing with the Public Utility Commission. VELCO does not anticipate adverse impacts at the residences closest to the Substation.
- Fall 2020
- Public meetings
- Winter 2021
- Regulatory and permitting process
- Summer 2021
- Construction start
- Fall 2021
- Anticipated completion