TRC

Transmission & Distribution Standards Development

TRC helped Iberdrola USA develop a new set of Transmission and Distribution Framing Standards that incorporated the best practices of each of the company's three operating companies.

Industries

Client

Iberdrola USA

Project Location

Maine & New York

Iberdrola USA (IUSA) contracted TRC to help them develop a new set of Transmission and Distribution Framing Standards that incorporated the best practices of each of its three IUSA Operating Companies (OpCOs): Central Maine Power Company (CMP), New York State Electric and Gas (NYSE&G), and Rochester Gas and Electric (RG&E). Another goal of this project was to consolidate material data from all three OpCOs into a new, global purchasing database.

A major challenge was to take the standards of 3 different operating companies and combine them into a single comprehensive standard. This entailed complete reviews of the existing standards for all voltage classes (8 different voltages), as well as assessing the best design and construction practices to be incorporated into the consolidated standards. Another major challenge was to review all of the materials and combatible units. Combined, this represented several thousand parts and pieces, reviewed for duplicate materials, and selecting the optimum material items to be used for the new standard. IUSA also requested new requirements that were not in wide use across the OPCOs that were required to be included:

  • 115kV and above structures shall be steel
  • 69kV and lower cross arms shall be fiberglass
  • Widespread use of Polymer Insulators
  • Increased clearance buffers to ground and other objects
  • Increased Basic Impulse Levels (BIL) for all structures, etc.

Over a period of 3 ½ years for the transmission portion and 1 ½ years for the distribution, TRC worked to consolidate and develop new standards based on the best management practices currently in place by each OPCO, updated to meet the latest national safety codes. TRC’s portion encompassed the creation of more than 800 pages of new standards ranging over 8 different voltage classes. TRC also developed a series of guidelines, such as for clearances, guying calculations, foundation designs, vibration mitigation as well as many others.

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