Project Details

Maine. RLC provided complete design and design study support services (including an arc flash study) for the project including the fourteen (14) turbines, the 34.5 kV collector system, and the collector substation connecting to the CMP 115 kV transmission network.

The arc flash study for the project covered low voltage (400V) cabinets within the nacelles, medium voltage (34.5kV) equipment at the GSUs in the base of the towers and at the collector substation, and high voltage (115kV) equipment at the substation. Low voltage equipment was modeled using SKM based on IEEE 1584-2018 equations. Medium and high voltage equipment was modeled using Arc Pro. The arc flash analysis for all equipment involved high and low fault current scenarios. Special consideration was given to scenarios for equipment within the nacelle based on the operator work requirements. The SKM model included all impedance characteristics, protective device settings, and arc flash sensing technology within the nacelle.

Scope of Services

• Initial RFI and Kickoff Meeting
  • Client given opportunity request specific work requirements (e.g. turbine is off when operator in nacelle) and deliverable formats
• Draft Report Delivered to Client
  • Duration: 3 weeks after all materials received from client
  • Report provided detailed outline of study methodology, arc flash label philosophy, model details, and preliminary incident energy results
  • Client given chance to request changes to methodology, model assumptions, or data reporting format
• Final Report Delivered to Client
  • Duration: 2 weeks after all comments received from client
  • Report included summary table for worst case incident energy for each type of equipment within nacelle
  • Arc flash labels in requested format included as appendix