Niagara Mohawk Power d/b/a National Grid USA is proposing to perform a refurbishment project on the T2160 Dewitt – Tilden #19 single-circuit 115-kV transmission line, which begins at the Dewitt substation in the town of Dewitt, N.Y., and ends at the Tilden substation in the town of Onondaga, N.Y.
According to the company’s Nov. 26 Part 102 report filed with the state Public Service Commission, the line is about 7.5 miles long and is located within Onondaga County, N.Y., passing through Dewitt, Onondaga and the town of Lafayette. It is located on mostly single circuit wood H frame structures.
The project is a conductor clearance refurbishment project that is necessary to provide system reliability to the electric end users, as well as provide for public safety in areas where structure replacement or other methods are used to mitigate substandard clearances.
The company also said that similar to projects conducted in accordance with the 2010 NERC guidance document involving field conditions and facility ratings, National Grid adheres to a limited timeline to address substandard clearances to comply with New York ISO standards and guidelines related to facility ratings.
The line has been identified as having five areas with possible substandard clearances, the company added, noting that engineering analysis is still being performed to determine if all five areas actually have substandard clearances based on the actual operation of the line.
Due to the rigid timeline to remedy a potential safety issue, National Grid said it is submitting the Part 102 report assuming the five areas will require structure replacement or the installation of intermediate structures. That will ensure that once the engineering analysis is complete, the company will have obtained the necessary approvals to correct the substandard clearances and mitigate potential safety concerns.
The project requires preparation of the Part 102 report because it involves the replacement of three existing structures resulting in a height increase of greater than 10 feet as well as the installation of two intermediate structures, has a voltage of 65 kV or higher, and work will start over one mile or longer in length.
All project activities will take place within the existing managed right-of-way, which is held by easement, National Grid said, adding that no new property rights are required for the project.
Among other things, the company said that the portions of the project requiring structure replacement to mitigate the substandard clearances are primarily in rural or low density residential areas.
National Grid is a subsidiary of National Grid plc.