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Facility Connection RequirementsMay 1, 2005

connection to an FPL-NED substation ground grid.

All transmission line structures must be adequately bonded and grounded to control step and touch potential in compliance with the NESC, and to provide adequate lightning performance.  All transmission lines should have a continuous ground wire, not relying on earth as the primary conductor, to transfer fault current between structures and to substations and plant switchyards.  Any exceptions to a continuous ground wire shall be verified with a system study.  All ground wires and bond wires must be adequately sized to handle anticipated maximum fault currents and duty without damage.

Transmission interconnections may substantially increase fault current levels at nearby substations and transmission lines.  Modifications to the ground grids of existing substations and OHGWs of existing lines may be necessary.  The Interconnection Study will determine if modifications are required and the scope and cost of the modifications.

I. K.  Insulation Coordination

Insulation coordination is the selection of insulation strength.  Insulation coordination must be done properly to ensure electrical system reliability and personnel safety.  Basic Surge Level (BSLs), surge arrester, conductor spacing and gap application, substation and transmission line insulation strength, protection, and shielding shall be documented and submitted for evaluation as part of the interconnection plan.  

FPL-NED’s standard is to shield substations and transmission lines from direct lightning strokes and to provide line entrance arresters at transmission line terminals.  Surge arresters are also applied at major components and systems.

Interconnection facilities to be constructed in areas with salt spray contamination or other type of contamination shall be properly designed to meet or exceed the performance of facilities not in a contamination area with regard to contamination caused outages.

I. L.  Structures

Transmission and substation structures for facilities connected to the FPL-NED transmission system shall be designed to meet the National Electrical Safety Code (NESC).  Substation bus systems shall be designed to comply with ANSI/IEEE Standard 605, IEEE Guide for the Design of Substation Rigid-Bus Structures.  

In addition, for both transmission and substation, structural load criteria shall meet all requirements as specified by “Minimum Design Loads for Buildings and Other Structures”, ANSI 7-02, published by American Society of Civil Engineers (ASCE).   Proper structural category shall be determined based on ANSI 7-02, Table 1-1.


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