SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
CONTENTS
1 INTRODUCTION - R1.1, R1.2.2, R1.3* ................................................................... 2 2 TRANSMISSION LINES (TRANSMISSION CONDUCTORS) - R1.2, R1.3* ....... 3 3 TRANSFORMERS - R1.2, R1.3*............................................................................... 4 4 INSTRUMENT TRANSFORMERS - R1.2, R1.3* .................................................... 5 5 RELAY PROTECTIVE DEVICES (RELAYS) - R1.2, R1.3* .................................. 6 6 LINE TRAPS - R1.2, R1.3* ........................................................................................ 7 7 SERIES REACTORS - R1.2, R1.3* ........................................................................... 8 8 CIRCUIT BREAKERS - R1.2, R1.3* ........................................................................ 9 9 CIRCUIT SWITCHERS - R1.2, R1.3* ..................................................................... 11 10 SWITCHES - R1.2, R1.3* ........................................................................................ 12 11 BUS - R1.2, R1.3*..................................................................................................... 13 12 SHUNT COMPENSATION DEVICES (SHUNT CAPACITORS) - R1.2, R1.3* .. 14 13 GENERATORS - R1.2, R1.3* .................................................................................. 15 14 DISTRIBUTION OF FACILITY RATING METHODOLOGY - R2, R3* ............. 16 15 REVIEW OF SEMINOLE FACILITY RATINGS - R3*......................................... 16 * NERC Reliability Standard FAC-008-1 Requirement(s) covered by this section of the
Seminole Bulk Electric System Facility Rating Methodology.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
1
INTRODUCTION
This document describes the methodology used to develop ratings for the Bulk Electric
System (BES) Facilities that are solely and jointly owned by Seminole Electric
Cooperative, Inc. (Seminole). Furthermore, it is the intent of this document to
demonstrate Seminole’s compliance with NERC Reliability Standard FAC-008-1.
This document describes the Seminole Facility Rating Methodology for the following
BES equipment (100 kV and above):
1
2
3
4
5
6
7
Transmission Lines (Transmission Conductors)
Transformers
Instrument Transformers
Relay Protective Devices (Relays)
Terminal Equipment (Line Traps, Series Reactors, Circuit Breakers, Circuit
Switchers, Switches & Bus)
Shunt Compensation Devices (Shunt Capacitors).
Generators
NOTE: Seminole does not own, jointly own or maintain any High Voltage Direct
Current equipment, Series Compensation Devices or shunt reactors (a type of
Shunt Compensation Device).
Seminole does not operate any Facility beyond its Normal Rating. The Emergency
Rating is equivalent to the Normal Rating for all Seminole Facilities. Additionally, the
Seminole Facility Rating is derived from the most limiting applicable Equipment Rating
of the individual equipment that comprises the Facility.
Seminole’s Facility Rating Methodology and Equipment Ratings consider the following:
 Ratings and warranties provided by equipment manufacturers
 IEEE, ANSI, ASTM, NESC, RUS and other standards and rules as applicable
 Ambient conditions
 Operating limitations
 Other assumptions, as appropriate to the facility equipment.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
2
TRANSMISSION LINES (TRANSMISSION CONDUCTORS)
Transmission Lines1 are specified, designed and operated as per the following:
 IEEE C2 - National Electric Safety Code® (NESC®)
 IEEE 1312.1 - IEEE Standard for Insulation Coordination—Definitions, Principles,
and Rules (as per validity date)
 IEEE 1312.2 - IEEE Guide for the Application of Insulation Coordination (as per
validity date)
 IEEE 738 - IEEE Standard for Calculating the Current-Temperature of Bare
Overhead Conductors
 Transmission Line design documentation and drawings
 Operating limits specified by Transmission Line equipment manufacturer(s)
 Nameplate ratings do not exist for Transmission Lines. Therefore, the Normal Rating
of a Transmission Line shall be defined by the following:
 The rated system voltage of a Transmission Line shall be determined based on
the clearances specified in the above standards (IEEE C2 - NESC® shall have
the overriding authority in the selection of all clearances)
 Transmission conductors2 shall have a steady-state thermal rating and transient
thermal rating based on the below design parameters (Calculated using
Southwire’s SWRate (IEEE 738) program or by Alcan for ACSR/SD)
Design Parameters
Wind Speed
Latitude
Time
Environmental Conditions
Ambient Temperature
Total Irradiation (Sun & Atmosphere)
Value
3.0 ft / s
perpendicular to the conductor
30°
12:00 PM
Clear
Summer - 35°C
Winter - 0°C
2
96.14 W / ft
Coefficient of Emissivity
0.9
Coefficient of Solar Absorption
Maximum Steady-State Conductor
Temperature
0.9
NOTE: The Normal Rating of a conductor may be
specified at a lower allowable temperature to meet
NESC® and other requirements.
Maximum Transient Conductor Temperature (Maximum Duration = 13 cycles = 0.217 s)
AAC - 85°C
ACSR or ACSR/SD - 100°C
ACSS - 200°C
AAC - 340°C
ACSR, ACSR/SD, ACSS 645°C
 Seminole’s Emergency Rating is equivalent to the Normal Rating for Transmission
Lines
1
2
This section shall also apply to strain bus and jumpers (see Section 10 - Bus).
Conductor hardware is considered part of the conductor and rated equivalently.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
3
TRANSFORMERS
Transformers (liquid-immersed power and regulating transformers) are specified,
designed1 and operated as per the following:
 IEEE C57.12.00 - IEEE Standard for Standard General Requirements for LiquidImmersed Distribution, Power, and Regulating Transformers
 IEEE C57.12.70 - IEEE Standard Terminal Markings and Connections for
Distribution and Power Transformers
 IEEE C57.12.80 - IEEE Standard Terminology for Power and Distribution
Transformers
 IEEE C57.12.90 - IEEE Standard Test Code for Liquid-Immersed Distribution,
Power, and Regulating Transformers
 IEEE C57.19.00 - IEEE Standard General Requirements and Test Procedure for
Power Apparatus Bushings
 IEEE C57.19.01 - IEEE Standard Performance Characteristics and Dimensions
for Outdoor Apparatus Bushings
 IEEE C57.19.100 - IEEE Guide for Application of Power Apparatus Bushings
 IEEE C57.100 - IEEE Standard Test Procedure for Thermal Evaluation of LiquidImmersed Distribution and Power Transformers
 IEEE C57.116 - IEEE Guide for Transformers Directly Connected to Generators
 IEEE C57.131 - IEEE Standard Requirements for Load Tap Changers
 IEEE C37.91 - IEEE Guide for Protecting Power Transformers (as applicable)
 IEEE 1276 - IEEE Guide for the Application of High-Temperature Insulation
Materials in Liquid-Immersed Power Transformers (as applicable)
 IEEE 1538 - IEEE Guide for Determination of Maximum Winding Temperature
Rise in Liquid-Filled Transformers
 Operating limits specified by the manufacturer
 Transformers shall have a Normal Rating that is equivalent to the manufacturer’s
nameplate ratings except as follows:
 For any tap position specified on the manufacturer’s nameplate, the
Normal Rating for voltage and frequency shall be defined by IEEE
C57.12.00, Section 4.1.6.1
 Seminole’s Emergency Rating is equivalent to the Normal Rating for
Transformers
1
Seminole shall specify that manufacturers design transformers to conform with the standards listed in this
section.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
4
INSTRUMENT TRANSFORMERS
Instrument Transformers are specified, designed1 and operated as per the following:
 IEEE C57.13 - IEEE Standard Requirements for Instrument Transformers
 ANSI C93.1 - Requirements for Power-Line Carrier Coupling Capacitors and
Coupling Capacitor Voltage Transformers (CCVT)
 IEEE C57.13.1 - IEEE Guide for Field Testing of Relaying Current Transformers
 IEEE C57.13.2 - IEEE Standard Conformance Test Procedure for Instrument
Transformers
 IEEE C57.13.3 - IEEE Guide for Grounding of Instrument Transformer
Secondary Circuits and Cases
 IEEE C57.13.5 - IEEE Standard of Performance and Test Requirements for
Instrument Transformers of a Nominal System Voltage of
115 kV and Above
 IEEE C57.13.6 - IEEE Standard for High-Accuracy Instrument Transformers (as
applicable)
 IEEE C57.19.00 - IEEE Standard General Requirements and Test Procedure for
Power Apparatus Bushings
 IEEE C57.19.01 - IEEE Standard Performance Characteristics and Dimensions
for Outdoor Apparatus Bushings
 IEEE C57.19.100 - IEEE Guide for Application of Power Apparatus Bushings
 IEEE C37.110 - IEEE Guide for the Application of Current Transformers Used
for Protective Relaying Purposes
 Operating limits specified by the manufacturer
 Instrument Transformers shall have a Normal Rating that is equivalent to the
nameplate ratings and/or documented ratings provided by the manufacturer (as
specified by the above IEEE standards)
NOTE: Seminole utilizes instrument transformers with a variety of thermal rating
factors. Instrument transformer ratings are considered when establishing a
Facility Rating
 Seminole’s Emergency Rating is equivalent to the Normal Rating for Instrument
Transformers
1
Seminole shall specify that manufacturers design instrument transformers to conform with the standards
listed in this section.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
5
RELAY PROTECTIVE DEVICES (RELAYS)
The term “relay protective devices” is not defined in the NERC Glossary of Terms Used
in Reliability Standards. Therefore, “Relay protective devices” shall be recognized by
Seminole as equivalent to the term “relay” as defined by IEEE 100 – The Authoritative
Dictionary of IEEE Standards Terms.
Relay protective devices are specified, designed1 and operated as per the following:
 IEEE C37.90 - IEEE Standard for Relays and Relay Systems Associated with
Electric Power Apparatus
 IEEE C37.90.1 - IEEE Standard for Surge Withstand Capability (SWC) Tests for
Relays and Relay Systems Associated with Electric Power
Apparatus (as applicable)
 IEEE C37.90.2 - IEEE Standard for Withstand Capability of Relay Systems to
Radiated Electromagnetic Interference from Transceivers (as
applicable)
 IEEE C37.90.3 - IEEE Standard Electrostatic Discharge Tests for Protective
Relays (as applicable)
 Relay protective devices are not directly connected to BES Elements but are
connected indirectly through instrument transformers
 Relay protective devices have a Normal Rating that is specified, designed and
applied for the full range of system conditions to which they will be subjected on
a given BES Element
 Seminole’s Emergency Rating is equivalent to the Normal Rating for relay
protective devices
1
Seminole shall specify that manufacturers design relay protective devices to conform with the standards
listed in this section.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
6
LINE TRAPS
Line Traps are specified, designed1 and operated as per the following:
 ANSI C93.3 - ANSI Requirements for Power-Line Carrier Line Traps
 Operating limits specified by the manufacturer
 Line Traps have a Normal Rating that is equivalent to the nameplate ratings
and/or documented ratings provided by the manufacturer (as specified by the
above ANSI standard)
 Seminole’s Emergency Rating is equivalent to the Normal Rating for Line Traps
Line Traps are considered terminal equipment. The term “terminal equipment” is not
defined in the NERC Glossary of Terms Used in Reliability Standards. Therefore,
Seminole shall define “terminal equipment” to include, but not be limited to line traps,
series reactors, breakers, circuit switchers, switches, bus and jumpers.
1
Seminole shall specify that manufacturers design line traps to conform with the standards listed in this
section.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
7
SERIES REACTORS
Series Reactors are specified, designed1 and operated as per the following:
 IEEE C57.16 - IEEE Standard Requirements, Terminology, and Test Code for
Dry-Type Air-Core Series-Connected Reactors
 Operating limits specified by the manufacturer
 Series Reactors have a Normal Rating that is equivalent to the nameplate ratings
and/or documented ratings provided by the manufacturer (as specified by the
above IEEE standard)
 Seminole’s Emergency Rating is equivalent to the Normal Rating for Series
Reactors
Series reactors are classified as terminal equipment since they are utilized on Seminole’s
BES as current limiting elements, when supplied with shunt compensation devices (shunt
capacitors). The term “terminal equipment” is not defined in the NERC Glossary of
Terms Used in Reliability Standards. Therefore, Seminole shall define “terminal
equipment” to include, but not be limited to line traps, series reactors, breakers, circuit
switchers, switches, bus and jumpers.
1
Seminole shall specify that manufacturers design series reactors to conform with the standards listed in
this section.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
8
CIRCUIT BREAKERS
Circuit Breakers are specified, designed1 and operated as per the following:
 IEEE C37.010 - IEEE Application Guide for AC High-Voltage Circuit Breakers
Rated on a Symmetrical Current Basis
 IEEE C37.011 - IEEE Application Guide for Transient Recovery Voltage for AC
High-Voltage Circuit Breakers Rated on a Symmetrical Current
Basis
 IEEE C37.012 - IEEE Application Guide for Capacitance Current Switching for
AC High-Voltage Circuit Breakers Rated on a Symmetrical
Current Basis
 IEEE C37.013 - IEEE Standard for AC High-Voltage Generator Circuit Breakers
Rated on a Symmetrical Current Basis
 IEEE C37.04 - IEEE Standard Rating Structure for AC High-Voltage Circuit
Breakers
 IEEE C37.04a/b - IEEE Standard Rating Structure for AC High-Voltage Circuit
Breakers Rated on a Symmetrical Current Basis — (as
applicable)
 Amendment 1: Capacitance Current Switching
 Amendment 2: To Change the Description of Transient
Recovery Voltage for Harmonization with IEC 62271-100
 IEEE C37.06 - AC High-Voltage Circuit Breakers Rated on a Symmetrical
Current Basis – Preferred Ratings and Related Required
Capabilities
 IEEE C37.06.1 - Guide for High-Voltage Circuit Breakers Rated on a
Symmetrical Current Basis Designated “Definite Purpose for Fast
Transient Recovery Voltage Rise Times”
 IEEE C37.09 - IEEE Standard Test Procedure for AC High-Voltage Circuit
Breakers Rated on a Symmetrical Current Basis
 IEEE C37.09a - IEEE Standard Test Procedure for AC High-Voltage Circuit
Breakers Rated on a Symmetrical Current Basis —
Amendment 1: Capacitance Current Switching
 IEEE C37.09 / Cor 1 - IEEE Standard Test Procedure for AC High-Voltage
Circuit Breakers Rated on a Symmetrical Current Basis—
Corrigendum 1
 IEEE C37.11 - IEEE Standard Requirements for Electrical Control for AC HighVoltage Circuit Breakers Rated on a Symmetrical Current Basis
 IEEE C57.19.00 - IEEE Standard General Requirements and Test Procedure for
Power Apparatus Bushings
 IEEE C57.19.01 - IEEE Standard Performance Characteristics and Dimensions
for Outdoor Apparatus Bushings
1
Seminole shall specify that manufacturers design circuit breakers to conform with the standards listed in
this section.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
 IEEE C57.19.100 - IEEE Guide for Application of Power Apparatus Bushings
 Operating limits specified by the manufacturer
 Circuit Breakers have a Normal Rating that is equivalent to the nameplate ratings
and/or documented ratings provided by the manufacturer (as specified in the
above IEEE standards)
 Seminole’s Emergency Rating is equivalent to the Normal Rating for Circuit
Breakers
Circuit Breakers are considered terminal equipment. The term “terminal equipment” is
not defined in the NERC Glossary of Terms Used in Reliability Standards. Therefore,
Seminole shall define “terminal equipment” to include, but not be limited to line traps,
series reactors, breakers, circuit switchers, switches, bus and jumpers.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
9
CIRCUIT SWITCHERS
Circuit Switchers are specified, designed1 and operated as per the following:
 IEEE C37.016 - IEEE Standard for AC High-Voltage Circuit Switchers rated
15.5 kV through 245 kV
 IEEE 1247 - IEEE Standard for Interrupter Switches for Alternating Current,
Rated Above 1000 V
 IEEE C37.04 - IEEE Standard Rating Structure for AC High-Voltage Circuit
Breakers
 IEEE C37.06 - AC High-Voltage Circuit Breakers Rated on a Symmetrical
Current Basis – Preferred Ratings and Related Required
Capabilities
 IEEE C37.09 - IEEE Standard Test Procedure for AC High-Voltage Circuit
Breakers Rated on a Symmetrical Current Basis
 Operating limits specified by the manufacturer
 Circuit Switchers have a Normal Rating that is equivalent to the nameplate ratings
and/or documented ratings provided by the manufacturer (as specified in the
above IEEE standards)
 Seminole’s Emergency Rating is equivalent to the Normal Rating for Circuit
Switchers
Circuit Switchers are considered terminal equipment. The term “terminal equipment” is
not defined in the NERC Glossary of Terms Used in Reliability Standards. Therefore,
Seminole shall define “terminal equipment” to include, but not be limited to line traps,
series reactors, breakers, circuit switchers, switches, bus and jumpers.
1
Seminole shall specify that manufacturers design circuit switchers to conform with the standards listed in
this section.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
10 SWITCHES
Switches are specified, designed1 and operated as per the following:
 IEEE C37.30 - IEEE Standard Requirements for High-Voltage Switches
 IEEE C37.32 - IEEE / American National Standard for High Voltage Switches,
Bus Supports, and Accessories Schedules of Preferred Ratings,
Construction Guidelines, and Specifications
 IEEE C37.34 - IEEE Standard Test Code for High-Voltage Air Switches
 IEEE C37.35 - IEEE Guide for the Application, Installation, Operation, and
Maintenance of High-Voltage Air Disconnecting and Interrupter
Switches
 IEEE C37.36b - IEEE Guide to Current Interruption with Horn-Gap Air Switches
 IEEE C37.37 - IEEE Loading Guide for AC High-Voltage Air Switches (in
Excess of 1000 V)
 Operating limits specified by the manufacturer
 Switches have a Normal Rating that is equivalent to the nameplate ratings and/or
documented ratings provided by the manufacturer (as specified by the above
IEEE standards)
 Seminole’s Emergency Rating is equivalent to the Normal Rating for switches
Switches are considered terminal equipment. The term “terminal equipment” is not
defined in the NERC Glossary of Terms Used in Reliability Standards. Therefore,
Seminole shall define “terminal equipment” to include, but not be limited to line traps,
series reactors, breakers, circuit switchers, switches, bus and jumpers.
1
Seminole shall specify that manufacturers design switches to conform with the standards listed in this
section.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
11 BUS
A rigid-bus structure (rigid bus) is specified, designed and operated as per the following:
 IEEE 605 - IEEE Guide for Design of Substation Rigid-Bus Structures
 IEEE 1427 - IEEE Guide for Recommended Electrical Clearances and Insulation
Levels in Air-Insulated Electrical Power Substations
 Aluminum Electrical Conductor Handbook, Third Edition, Chapter 13, The
Aluminum Association, 1989 (as applicable)
 Operating limits specified by the manufacturer
 Nameplate ratings do not exist for rigid bus. Therefore, the Normal Rating of
rigid bus shall be defined as follows:
 The rated system voltage of rigid bus shall be determined based on the
clearances specified in the above standards (as applicable)
 Rigid bus conductor shall have a continuous current rating that is achieved
at the maximum allowable bus temperature specified below
Design Parameters
Value
Wind Speed
NOTE: Actual wind speed is 3.0 ft/s. Since IEEE 605 ampacity
calculations are based on documented testing at a more conservative wind
speed of 2.0 ft/s, this was the wind speed chosen for calculations.
Latitude
Time
Environmental Conditions
Ambient Temperature
Total Irradiation (Sun & Atmosphere)
Coefficient of Emissivity
Maximum Allowable Steady-State Rigid Bus
Temperature
Maximum Short-Circuit Rigid Bus Temperature
(Maximum Duration = 13 cycles = 0.217 s)
2.0 ft / s
perpendicular to the bus
30°
12:00 PM
Clear
Summer - 35°C
Winter - 0°C
96.4 W/ft2
0.5
Aluminum - 90°C
Aluminum - 100°C
 Seminole’s Emergency Rating is equivalent to the Normal Rating for rigid bus
Strain bus and jumpers are specified, designed and operated as per the requirements for
Transmission Lines (see Section 2 - Transmission Lines). Strain bus and jumpers are
rated for operation at the maximum allowable conductor temperature specified in
Section 2 for each type of conductor.
Rigid bus, strain bus, and jumpers are considered terminal equipment. The term
“terminal equipment” is not defined in the NERC Glossary of Terms Used in Reliability
Standards. Therefore, Seminole shall define “terminal equipment” to include, but not be
limited to line traps, series reactors, breakers, circuit switchers, switches, bus and
jumpers.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
12 SHUNT COMPENSATION DEVICES (SHUNT CAPACITORS)
Seminole installs shunt compensation devices (shunt capacitors) to deliver reactive power as
specified by the manufacturer’s nameplate rating when the substation bus operates at 1.0 per
unit voltage.
Shunt capacitors are specified, designed1 and operated as per the following:
 IEEE 18 - IEEE Standard for Shunt Power Capacitors
 IEEE 1036 - IEEE Guide for Application of Shunt Power Capacitors
 IEEE C37.40 - IEEE Standard Service Conditions and Definitions for High-Voltage
Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse
Disconnecting Switches, and Accessories
 IEEE C37.41 - IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses, Fuse
and Disconnecting Cutouts, Distribution Enclosed Single-Pole Air
Switches, Fuse Disconnecting Switches, and Fuse Links and
Accessories Used with These Devices
 IEEE C37.43 - IEEE Standard Specifications for High-Voltage Expulsion, CurrentLimiting, and Combination-Type Distribution and Power Class
External Fuses, with Rated Voltages from 1 kV through 38 kV,
Used for the Protection of Shunt Capacitors
 IEEE C37.46 - American National Standard for High Voltage Expulsion and CurrentLimiting Type Power Class Fuses and Fuse Disconnecting Switches
 IEEE C37.48 - IEEE Guide for the Application, Operation, and Maintenance of HighVoltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse
Disconnecting Switches, and Accessories
 IEEE C37.48.1 - IEEE Guide for the Operation, Classification, Application, and
Coordination of Current-Limiting Fuses with Rated Voltages 1 –
38 kV
 IEEE C37.99 - IEEE Guide for the Protection of Shunt Capacitor Banks (as
applicable)
 IEEE C57.19.00 - IEEE Standard General Requirements and Test Procedure for
Power Apparatus Bushings
 IEEE C57.19.01 - IEEE Standard Performance Characteristics and Dimensions for
Outdoor Apparatus Bushings
 IEEE C57.19.100 - IEEE Guide for Application of Power Apparatus Bushings
 Shunt capacitors shall be capable of operating continuously over the full range of
normal system voltage conditions and ranges to which these shunt compensation
devices will be subjected.
 Operating limits specified by the manufacturer
 Shunt capacitors have a Normal Rating that is equivalent to the nameplate ratings
and/or documented ratings provided by the manufacturer (as specified by the
above IEEE standards)
 Seminole’s Emergency Rating is equivalent to the Normal Rating for shunt capacitors
1
Seminole shall specify that manufacturers design shunt capacitors to conform with the standards listed in
this section.
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SEMINOLE ELECTRIC COOPERATIVE, INC.
BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
13 GENERATORS
Seminole Generating Station (SGS)
SGS is comprised of two coal fired boilers that each provides steam separately to two
steam turbine driven generators. The generators are referred to as #1 and #2. The
generators are hydrogen cooled.
Midulla Generating Station (MGS)
MGS is comprised of a combined cycle gas turbine(s) and set of simple cycle peaking gas
turbines.
The combined cycle plant is fueled by natural gas or #2 fuel oil and consists of two
combustion turbine driven generators and one steam turbine driven generator. The
combined cycle combustion turbine driven generators are referred to as #1 and #2. The
steam turbine generator is referred to as #3.
The peaking plant consists of five simple cycle, aero derivative combustion turbine
driven generators fueled by natural gas or #2 fuel oil. The peaking unit generators are
referred to as generators #4, #5, #6, #7 & #8.
All of the generators at MGS are air cooled.
The normal continuous rating of the generation facility is based on manufacturer’s
nameplate rating and the associated capability curves specific to a given generator. The
rating for the entire generation facility is based on the most limiting rating for all of the
equipment that comprises the facility. Seminole’s generation facilities are limited to the
manufacturer’s nameplate rating which are subject to ambient conditions. The
generation facilities’ power output is limited to the manufacturer’s normal nameplate
rating; i.e., no emergency output rating, beyond normal, is allowed.
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BULK ELECTRIC SYSTEM FACILITY RATING METHODOLOGY
2009-FAC-008-1-MTD-1-4
14 DISTRIBUTION OF FACILITY RATING METHODOLOGY
Seminole posts its Bulk Electric System (BES) Facility Rating Methodology document
on the Seminole OASIS node. The Seminole BES Facility Rating Methodology is
available for inspection and technical review by those entities that have responsibility for
the area in which, Seminole Facilities are located. Those entities may include, but are not
limited to:
 Reliability Coordinators
 Transmission Operators
 Transmission Planners
 Planning Authorities
For immediate access to Seminole’s BES Facility Rating Methodology, please download
the document from Seminole’s OASIS node (to be posted by 09-10-2009). Seminole’s
BES Facility Rating Methodology is directly available from Seminole within 15 business
days of receipt of a request.
Any entity who wishes to provide written comments on the Seminole BES Facility
Rating Methodology, may send those comments to the Manager – Transmission and
Substation Engineering. Seminole shall provide a written response to that commenting
entity within 45 calendar days of receipt of those comments. The response shall indicate
whether a change(s) will be made to the Seminole BES Facility Rating Methodology. If
no change(s) will be made to the BES Facility Rating Methodology, Seminole shall state
the reason for its disposition. If modifications to the Seminole BES Facility Rating
Methodology document are required based on the submitted comments, Seminole will
make the appropriate modifications and repost the document on Seminole’s OASIS node
with a new document revision number and date.
15 REVIEW OF SEMINOLE FACILITY RATINGS
Seminole will review its Facility Ratings for all facilities on an annual basis. To the
extent that any facility ratings have been modified, those new ratings will be
communicated to the FRCC as part of the Load Flow Databank Process.
16