Scope and Purpose


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Bulk Electric System

Facility Rating Methodology

Revisions



Rev.

No.


Date


Description


By


Approval

0

2/18/00

New Document

DCS/JWS

RDC

1

11/1/04

Rev. for FRCC 2004 Compliance Program with 2001 NERC Planning Standards; added series and shunt reactive elements

DCS/JWS

JJM

2

8/25/05

Reformatted & added document number; rev 3.4 - added OPGW; rev 4.3 – added specific criteria; added Appendix A – Generator rating.

DCS

JJM

3

10/14/05

Rev. 4.8 – Fault current methodology.

DCS

JJM

4

2/28/07

Reformatted & revised throughout, updated conductor methodology, added GSU, updated generator methodology.

DCS/JJM/MCW/JAZ

JJM

5

7/01/08

Reformatted & revised throughout. Added emergency ratings methodologies.

RAC/MDJ/

JJM/NCA

JJM

6

9/29/08

Deleted Appendix A. Generation Document will be posted separately.

BJM

BJM

Table of Contents



Scope and Purpose 4

Transmission Facilities 5

Terminal Equipment 12



Scope and Purpose



This document describes the methodology FPL presently uses to rate its Bulk Electric System (BES) Facilities. The methodology described herein covers Facilities solely owned by FPL and Facilities jointly owned for which FPL has responsibility for providing ratings. It is intended to provide documentation in compliance with the NERC Reliability Standard FAC-008-1, approved by NERC Board of Trustees with an effective date of August 7, 2006. FPL bases its rating methodology on industry standards as discussed below. These standards have changed over the years and FPL modifies its rating methodology from time to time to keep pace with accepted industry practice. This document describes FPL’s current methodology and makes no assumptions as to the design criteria of legacy equipment and facilities.
This document describes the current FPL rating methodology for the following Bulk Electric System Facilities as defined in the NERC Glossary of Terms dated August 2, 2006:

  1. Transmission lines

  2. Transformers

  3. Shunt Compensators which includes Shunt Capacitors and Shunt Reactors.

  4. Series Reactors

  5. Generators


The Facilities addressed in this document are comprised of various electrical equipment or Elements (defined term by NERC). FPL Facilities may contain one or more Elements. For example, a transmission line includes conductors, line traps, switches, and breakers. Protective relays for the line will also be included as part of the transmission line Facility. All this equipment or Elements operate together with the limiting Facility ratings being derived from the individual equipment ratings. Thus the Facility ratings will be limited by the most limiting equipment rating. Likewise, the Facility rating will not exceed the most limiting rating of any equipment that comprises the Facility.
The scope of equipment or Elements addressed in this document includes the following:

  1. Transmission Conductors

  2. Transformers

  3. Series and Shunt Compensation Devices

  4. Generators

  5. Terminal Equipment

  6. Relay Protective Devices


Terminal Equipment includes: circuit breakers, switches, substation conductors, instrument transformers and line traps.
FPL has no transmission level Series Capacitors, Flexible A/C Transmission Systems such as SVC or STATCOM, High Voltage Direct Current or Electrical Energy Storage devices.

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