Westar Facility Ratings Method - OATI webSmartOASIS...2017/02/10 · 2.0 SCOPE 2.1 This method documents the technically sound principles for calculation of Normal and Emergency Facility

Effective 02/10/2017 Page 1 of 24

FACILITY RATINGS METHOD

TABLE OF CONTENTS

1.0 PURPOSE ............................................................................................................................ 2

2.0 SCOPE ................................................................................................................................. 3

3.0 COMPLIANCE.................................................................................................................... 4

4.0 DEFINITIONS ..................................................................................................................... 5

5.0 RESPONSIBILITIES .......................................................................................................... 7

6.0 PROCEDURE ...................................................................................................................... 8

6.4 Generating Equipment Ratings ...................................................................................... 10

6.5 Transmission Equipment Ratings .................................................................................. 13

7.0 RECORDS ......................................................................................................................... 18

8.0 FORMS .............................................................................................................................. 19

9.0 ATTACHMENTS .............................................................................................................. 20

9.1 Uniform Environmental Conditions Table ..................................................................... 20

10.0 REVISION HISTORY....................................................................................................... 23


1.0 PURPOSE

1.1 This procedure documents Westar Energy’s Transmission Owner and Generator Owner method to develop and communicate the Facility Ratings for all solely and jointly owned Facilities. [FAC-008-3 R1, R2 & R3]


2.0 SCOPE

2.1 This method documents the technically sound principles for calculation of Normal and Emergency Facility Ratings of the solely and jointly owned Westar Energy generating units. [FAC-008-3 R1 & R2] Solely owned generating facilities are rated according to this Facility Rating Method. Jointly owned generating facilities for which Westar Energy is the registered Generator Owner shall also be rated according to this Facility Rating Method. This method of rating generating units considers SPP Planning Criteria 7.1. This method of rating generating facilities includes all applicable equipment detailed in Section 6.4 of this Facility Rating Method.

2.2 This method documents the technically sound principles for calculation of Normal and Emergency Facility Ratings of the solely and jointly owned Westar Energy Transmission Facilities regardless of voltage. [FAC-008-3 R3] This method of rating Transmission Facilities considers SPP Planning Criteria 7.2. This method of rating Transmission Facilities includes all applicable equipment detailed in Section 6.5 of this Facility Rating Method. All circuit ratings are based on summer seasonal facility ratings, except as noted in Section 6.9.

2.3 The categories of equipment rated include, but are not limited to: generators, conductors, transformers, relay protective devices, terminal equipment, and series and shunt compensation devices as detailed in Sections 6.4 and 6.5 of this Facility Ratings Method. [FAC-008-3 R2.4.1 & R3.4.1]


3.0 COMPLIANCE

3.1 Each Generator Owner shall have documentation that shows how its Facility Ratings were determined as identified in FAC-008-3 Requirement 1.

3.2 Each Generator Owner shall have a documented Facility Ratings methodology that includes all of the items identified in FAC-008-3 Requirement 2, Parts 2.1 through 2.4.

3.3 Each Transmission Owner shall have a documented Facility Ratings methodology that includes all of the items identified in FAC-008-3 Requirement 3, Parts 3.1 through 3.4.

3.4 Each Transmission Owner shall have evidence, such as a copy of a dated electronic note, or other comparable evidence to show that it made its Facility Ratings methodology available for inspection within 21 calendar days of a request in accordance with FAC-008-3 Requirement 4. The Generator Owner shall have evidence, such as a copy of a dated electronic note, or other comparable evidence to show that it made its documentation for determining its Facility Ratings or its Facility Ratings methodology available for inspection within 21 calendar days of a request in accordance with FAC-008-3 Requirement 4.

3.5 Each Transmission Owner and Generator Owner shall have evidence to show that its Facility Ratings are consistent with the documentation for determining its Facility Ratings as specified in Requirement R1 or consistent with its Facility Ratings methodology as specified in FAC-008-3 Requirements R2 and R3 (Requirement R6).

3.6 Each Generator Owner shall have evidence, such as a copy of a dated electronic note, or other comparable evidence to show that it provided its Facility Ratings to its associated Reliability Coordinator(s), Planning Coordinator(s), Transmission Planner(s), Transmission Owner(s) and Transmission Operator(s) in accordance with FAC-008-3 Requirement R7.

3.7 Each Transmission Owner (and Generator Owner subject to Requirement R2) shall have evidence, such as a copy of a dated electronic note, or other comparable evidence to show that it provided its Facility Ratings and identity of limiting equipment to its associated Reliability Coordinator(s), Planning Coordinator(s), Transmission Planner(s), Transmission Owner(s) and Transmission Operator(s) in accordance with Requirement R8.


4.0 DEFINITIONS

4.1 Book Rating: The rating provided by the manufacturer or a suitable conductor reference manual. Conditions for overhead conductor are generally based upon a 50 degree C temperature rise above a 25 degree C ambient temperature with 2 ft/sec wind perpendicular to the conductor.

4.2 Emergency Rating: The rating as defined by the equipment owner that specifies the level of electrical loading or output that a system, facility, or element can support, produce, or withstand for a finite period. The rating assumes acceptable loss of equipment life or other physical or safety limitations for the equipment involved.

4.3 Equipment Rating: The maximum and minimum voltage, current, frequency, real and reactive power flows on individual equipment under steady state, short-circuit and transient conditions, as permitted or assigned by the equipment owner.

4.4 Facility Rating: The maximum or minimum voltage, current, frequency, or real or reactive power flow through a facility that does not violate the applicable equipment rating of any equipment comprising the facility.

4.5 Generation Facility: Facilities that comprise all current carrying equipment from the generating unit to the point of interconnection with the Transmission Owner.

4.6 Generator Owner: Entity that owns and maintains generating units.

4.7 High Operating limit or High Alarm limit: Terms used in the displays of the SCADA / EMS real-time system and are named as such by the system developer / manufacturer. These terms are functionally equivalent to Emergency Rating.

4.8 High Warning limit: Term used in the displays of the SCADA / EMS real-time systems and is named as such by the system developer / manufacturer.

4.9 Manufacturer’s Nameplate Ratings: Ratings provided by the manufacturer of equipment are assumed to consider design criteria, ambient conditions, operating limitations and other design assumptions.

4.10 Normal Rating: The rating as defined by the equipment owner that specifies the level of electrical loading that a system, facility, or element can support or withstand through the daily demand cycles without loss of equipment life.

4.11 Overhead Conductor: A wire or combination of wires not insulated from one another suitable for carrying an electric current. Overhead conductor is separate and distinct from rigid bus.


4.12 Rigid Bus: A solid or tubular conductor.

4.13 Transmission Facility: Facilities that comprise the current carrying equipment connected in series between circuit breakers or comparable switching devices. A Transmission Facility shall also include substation terminal equipment including, but not limited to breakers, switches, and conductor.

4.14 Transmission Owner: The entity that owns and maintains Transmission Facilities.


5.0 RESPONSIBILITIES

5.1 Facility Ratings Method is reviewed and updated by a cross-functional team of subject matter experts within Westar Energy not less frequently than once per calendar year and coordinated by NERC Compliance. The cross-functional team includes representatives from Generation Reliability Engineering, NERC Compliance, Substation Engineering, System Planning, and System Operations.

5.2 Facility Ratings Method is approved by the Director of Generation Support, the Director of Transmission & Substation Construction Services, and the Executive Director of System Operations.

5.3 Facility Ratings Method shall be posted on the Westar Energy public OASIS site.

5.4 Facility Ratings developed shall be provided to SPP to ensure accurate modeling of steady-state data in accordance with the procedures developed and maintained by the SPP Model Development Working Group.

5.5 Westar Energy shall provide requested information as specified below (for its solely and jointly owned Facilities that are existing Facilities, new Facilities, modifications to existing Facilities and re-ratings of existing Facilities) to its associated Reliability Coordinator(s), Planning Coordinator(s), Transmission Planner(s), Transmission Owner(s) and Transmission Operator(s): [FAC-008-3 R7][FAC-008-3 R8]

5.5.1 As scheduled by the requesting entities: [FAC-008-3 R8.1]

5.5.1.1 Facility Ratings [FAC-008-3 R8.1.1]

5.5.1.2 Identity of the most limiting equipment of the Facilities [FAC-008-3 R8.1.2]

5.5.2 Within 30 calendar days (or a later date if specified by the requester), for any requested Facility with a Thermal Rating that limits the use of Facilities under the requester’s authority by causing any of the following: 1) An Interconnection Reliability Operating Limit, 2) A limitation of Total Transfer Capability, 3) An impediment to generator deliverability, or 4) An impediment to service to a major load center: [FAC-008-3 R8.2]

5.5.2.1 Identity of the existing next most limiting equipment of the Facility [FAC-008-3 R8.2.1]

5.5.2.2 The Thermal Rating for the next most limiting equipment identified in Requirement R8, Part 8.2.1. [FAC-008-3 R8.2.2]


6.0 PROCEDURE

6.1 The applicable Facility Rating shall equal the most limiting applicable Equipment Rating of the individual equipment that comprises the Facility. [FAC-008-3 R1.2, R2.3 & R3.3] Solely owned Facilities are rated according to this Facility Ratings Method. Facilities that are jointly owned shall utilize the lesser rating as developed by each owner consistent with the facility owner’s applicable Facility Rating Method. [FAC-008-3 R6]

6.1.1 The point of demarcation between Generation Facilities and Transmission Facilities is the high side of the generator step-up transformer. At wind farm locations, the point of demarcation is the high side of the main collector transformer(s), not the high side of the individual wind turbine transformers. Equipment on the generation side of the point of demarcation shall be rated in accordance with Generating Equipment Ratings (Section 6.4), and equipment on the Transmission side of the point of demarcation shall be rated in accordance with Transmission Equipment Ratings (Section 6.5).

6.2 If applicable, the following items will be considered to determine ratings: ratings provided by the equipment manufacturer, applicable industry standards, design criteria, ambient conditions, operating limitations, and other assumptions.

Field verification may be utilized to identify nameplate equipment ratings, conductor or bus size and type, or any other information required to determine appropriate equipment and Facility Ratings. If equipment nameplate and manufacturer rating information is no longer available, engineering judgement and operating experience will be utilized to appropriately rate the equipment. [FAC-008-3 R1.1] [FAC-008-3 R2.1] [FAC-008-3 R2.2] [FAC-008-3 R3.1] [FAC-008-3 R3.2]

6.3 Uniform Environmental Conditions [FAC-008-3 R2.2.3 & R3.2.3]

6.3.1 Solar absorptivity is the ratio of incident solar radiant energy absorbed by a material body to the incident solar radiant energy absorbed by a blackbody at the same temperature. Solar absorptivity is set to 0.9. It is assumed that solar gain is based on full sun and a clear atmosphere.

6.3.2 Infrared emissivity is the ratio of infrared radiant energy emitted by a material body to the infrared radiant energy radiated by a blackbody at the same temperature. Infrared emissivity is set to 0.88.

6.3.3 Wind speed is assumed to be 2 ft/sec at a 90-degree angle to the conductor for overhead conductor. Wind speed is assumed to be 3 ft/sec at a 90-degree angle to the conductor for rigid bus installed in substations or switching stations.


6.3.4 Ambient temperature used for calculation of ratings is 40 degrees C during the summer season and is 10 degrees C during the winter season.

6.3.5 For purposes of rating calculation, elevation above sea level for Westar Energy is 1,155 feet.

6.3.6 For purposes of rating calculation, the azimuth of outdoor facilities is east-west.

6.3.7 For purposes of rating calculation, the latitude of outdoor facilities is 35 degrees north.

6.3.8 For purposes of rating calculation, the apparent solar time is 2:00 pm (1400 hours).


6.4 Generating Equipment Ratings

6.4.1 Bus

6.4.1.1 Isolated-phase or non-segregated bus shall be rated per the Manufacturer’s Nameplate Rating. If no Manufacturer’s Nameplate Rating is available, the design rating available on manufacturer’s schematic drawings or manufacturer’s test data shall be used. The Normal and Emergency Ratings shall be equal.

6.4.1.2 Rigid bus, Normal and Emergency Rating, shall be rated in accordance with IEEE Standard 605 – IEEE Guide for Bus Design in Air Insulated Substations. Conductors used on the Westar system for rigid bus shall be rated at 85 degrees C conductor temperature under Normal conditions and 100 degrees C conductor temperature under Emergency conditions.

6.4.2 Circuit Breaker

6.4.2.1 Circuit breaker continuous Normal Rating and Emergency Rating shall be set to the Manufacturer’s Nameplate Rating of the device.

6.4.3 Conductor

6.4.3.1 Conductors used on the Westar system for overhead lines (except SSAC (ACSS) overhead conductors) shall be rated at 85 degrees C conductor temperature under Normal conditions and 100 degrees C conductor temperature under Emergency conditions unless designed for a lower final conductor temperature, then it should be rated at that temperature. SSAC conductors shall be rated at 200 degrees C maximum conductor temperature for Normal Rating and Emergency Rating unless designed for a lower final conductor temperature, then it should be rated at that temperature. In cases where original engineering data or design criteria are not available, the conductor Normal Rating and Emergency Rating shall be set equal to the manufacturer’s Book Rating or the Book Rating of a suitable reference for the conductor type. This conservative approach is used in consideration of the age of Facilities currently in service. Loading at or below the Emergency Rating of overhead conductor is a continuous rating. Conductor ratings are calculated using the procedures in IEEE Standard 738 – IEEE Standard for Calculating the Current-Temperature of Bare Overhead Conductors.


6.4.3.2 Conductors used on the Westar system for strain bus or jumpers (except SSAC (ACSS) overhead conductors) shall be rated at 85 degrees C conductor temperature under Normal conditions and 100 degrees C conductor temperature under Emergency conditions unless designed for a lower final conductor temperature, then it should be rated at that temperature. SSAC conductors shall be rated at 200 degrees C maximum conductor temperature for Normal Rating and Emergency Rating unless designed for a lower final conductor temperature, then it should be rated at that temperature. Loading at or below the Emergency Rating of overhead conductor is a continuous rating. Conductor ratings are calculated using the procedures in IEEE Standard 738 – IEEE Standard for Calculating the Current-Temperature of Bare Overhead Conductors.

6.4.3.3 Underground cable Normal Rating shall be rated based on the engineered design capacity of the cable or based on manufacturer’s rating. The Normal Rating and Emergency Rating shall be equal.

6.4.4 Current Transformer (CT)

6.4.4.1 CT continuous Normal Rating and Emergency Rating shall be set to the tap setting times the thermal rating factor of the CT at that tap if known. An unspecified thermal rating factor is assumed to be 1.0. CTs may be rated according to Appendix PL-2.E of SPP Planning Criteria as determined appropriate by subject matter expert.

6.4.5 Generating Unit

6.4.5.1 Hydrogen cooled generators shall be rated in MVA according to Manufacturer’s Nameplate Rating or capability curve for the maximum rated hydrogen pressure. The Normal and Emergency Ratings shall be equal.

6.4.5.2 Air cooled generators shall be rated in MVA according to the Manufacturer’s Nameplate Rating or capability curve for the rated ambient air conditions. The Normal and Emergency Ratings shall be equal.

6.4.6 Power Transformer

6.4.6.1 Normal Rating on generator step-up transformers shall be set to the maximum allowable Manufacturer’s Nameplate Rating for the rated ambient air conditions with the Emergency Rating set equal to the Normal Rating.


6.4.6.2 The Emergency Rating of the generator step-up transformer, which is equal to the continuous transformer nameplate “normal” rating, shall be used as the High Operating limit or High Alarm limit in the SCADA / EMS real-time systems. The High Warning limit in the SCADA / EMS real-time systems for such generator step-up transformer shall be set at either 90% of the High Alarm limit or a value less than the High Alarm Limit as approved by the Director of Transmission and Generation System Operations based upon past operating experience.

6.4.7 Protective Device

6.4.7.1 Protective relays shall have ratings established in such a way as to not exceed the manufacturer’s specification for continuous current-carrying capacity of the device. If manufacturer’s specification is not available, protective relays are assumed to be capable of carrying 5 amperes of current delivered to the input of the relay. Protective relays have only a continuous rating which establishes the Normal Rating and Emergency Rating at the same value.

6.4.8 Switches

6.4.8.1 Switch Normal Rating and Emergency Rating shall be set to the Manufacturer’s Nameplate Rating of the device.

6.4.9 Series Reactive Compensation Device

6.4.9.1 These devices do not exist within generating facilities.

6.4.10 Shunt Reactive Compensation Device

6.4.10.1 These devices do not exist within generating facilities.


6.5 Transmission Equipment Ratings

6.5.1 Bus

6.5.1.1 Rigid bus, Normal and Emergency Rating, shall be rated in accordance with IEEE Standard 605 – IEEE Guide for Bus Design in Air Insulated Substations. Conductors used on the Westar system for rigid bus shall be rated at 85 degrees C conductor temperature under Normal conditions and 100 degrees C conductor temperature under Emergency conditions.

6.5.2 Circuit Breaker

6.5.2.1 Circuit breaker continuous Normal Rating and Emergency Rating shall be set to the Manufacturer’s Nameplate Rating of the device.

6.5.3 Current Transformer (CT)

6.5.3.1 CT continuous Normal Rating and Emergency Rating shall be set to the tap setting times the thermal rating factor of the CT at that tap if known. An unspecified thermal rating factor is assumed to be 1.0. CTs may be rated according to Appendix PL-2.E of SPP Planning Criteria as determined appropriate by subject matter expert.

6.5.4 Conductor


6.5.4.1 Conductors used on the Westar system for overhead transmission lines (except SSAC (ACSS) overhead conductors) shall be rated at 85 degrees C conductor temperature under Normal conditions and 100 degrees C conductor temperature under Emergency conditions unless designed for a lower final conductor temperature, then it should be rated at that temperature. SSAC conductors shall be rated at 200 degrees C maximum conductor temperature for Normal Rating and Emergency Rating unless designed for a lower final conductor temperature, then it should be rated at that temperature. In cases where original engineering data or design criteria on transmission lines are not available, the conductor Normal Rating and Emergency Rating shall be set equal to the manufacturer’s Book Rating or the Book Rating of a suitable reference for the conductor type. This conservative approach is used in consideration of the age of Transmission Facilities currently in service. Loading at or below the Emergency Rating of overhead conductor is a continuous rating. Conductor ratings are calculated using the procedures in IEEE Standard 738 – IEEE Standard for Calculating the Current-Temperature of Bare Overhead Conductors.

6.5.4.2 For transmission lines that are constructed as double circuit but are operated as a single circuit with phase conductors in parallel, a composite conductor rating is calculated based on the individual line conductors, the line impedances, and current sharing relationship of the line conductors utilized (current divider). This calculation utilizes individual conductor ratings consistent with 6.5.4.1 and ensures the most limiting conductor rating will not be exceeded with the line operating as a single circuit.

6.5.4.3 Conductors used on the Westar system for strain bus or jumpers (except SSAC (ACSS) overhead conductors) shall be rated at 85 degrees C conductor temperature under Normal conditions and 100 degrees C conductor temperature under Emergency conditions unless designed for a lower final conductor temperature, then it should be rated at that temperature. SSAC conductors shall be rated at 200 degrees C maximum conductor temperature for Normal Rating and Emergency Rating unless designed for a lower final conductor temperature, then it should be rated at that temperature. Loading at or below the Emergency Rating of overhead conductor is a continuous rating. Conductor ratings are calculated using the procedures in IEEE Standard 738 – IEEE Standard for Calculating the Current-Temperature of Bare Overhead Conductors.


6.5.4.4 Underground cable ratings are based on manufacturer’s Book Rating or the Book Rating of a suitable reference or engineering analysis for Normal Rating, Emergency Rating and short term Emergency Rating to avoid damage to the insulation due to thermal expansion. IEEE Standard 835 – IEEE Standard Power Cable Ampacity Tables may be used in calculating the underground cable ratings absent manufacturer’s data.

6.5.5 Power Transformer

6.5.5.1 Normal Rating on transmission transformers shall be set to the maximum allowable Manufacturer’s Nameplate Rating. The Emergency Rating is typically set to 110% of the Normal Rating. It may be set higher or lower based upon evaluation of field testing, operational history of the unit, and real time monitoring of oil temperatures. The Emergency Rating of transmission transformers is an eight (8) hour rating.

6.5.6 Primary Fuse

6.5.6.1 Primary fuse continuous Normal Rating and Emergency Rating shall be set to the Manufacturer’s Nameplate Rating of the device.

6.5.7 Protective Device

6.5.7.1 Protective relays shall have ratings established in such a way as to not exceed the manufacturer’s specification for continuous current-carrying capacity of the device. If manufacturer’s specification is not available, protective relays are assumed to be capable of carrying 5 amperes of current delivered to the input of the relay. Protective relays have only a continuous rating which establishes the Normal Rating and Emergency Rating at the same value.

6.5.8 Series Reactive Compensation Device

6.5.8.1 Series compensation devices shall be rated consistent with the voltage at which they are operated. Nominal operating voltage may be different from the design voltage. Reactive devices do not have any applicable Emergency Rating. Series connected reactors are specified and rated according to IEEE Standard 57.16 – IEEE Standard Requirements, Terminology, and Test Code for Dry-Type Air-Core Series-Connected Reactors.

6.5.9 Shunt Reactive Compensation Device


6.5.9.1 Shunt compensation devices shall be rated consistent with the voltage at which they are operated. Nominal operating voltage may be different from the design voltage. Reactive devices do not have any applicable Emergency Rating. Transmission shunt capacitors are specified and rated according to: IEEE Standard 18 – IEEE Standard for Shunt Power Capacitors; IEEE Standard 1036 – IEEE Guide for the Application of Shunt Power Capacitors; and IEEE Standard C37.99 – IEEE Guide for the Protection of Shunt Power Capacitors. Transmission shunt reactors are specified and rated according to the IEEE Standard C57.21 – IEEE Standard Requirements, Terminology, and Test Code for Shunt Reactors Rated Over 500 kVA.

6.5.10 Switches

6.5.10.1 Switch Normal Rating and Emergency Rating shall be set to the Manufacturer’s Nameplate Rating of the device.

6.5.11 Wave Trap

6.5.11.1 Epoxy-encapsulated wave traps shall have Normal Rating and Emergency Rating set to Manufacturer’s Nameplate Rating. Dry-type air-cored wave traps that are not epoxy-encapsulated wires shall have the Emergency Rating set to 110 percent of Manufacturer’s Nameplate Rating.

6.5.12 The composite rating on a terminal-to-terminal basis of Transmission Facilities shall be set to the most limiting equipment for normal and emergency conditions. Transmission Facility Ratings shall be updated as equipment is replaced and communicated to Transmission System Operations and to the Southwest Power Pool when such facilities are placed in service.

For Multi-Breaker configuration (breaker-and-half, Ring Bus, or double breaker/double bus), the equipment rating on the substation side of the terminal shall be rated based on one-breaker open. If the ratings of terminal equipment (such as breakers, switches, etc.) are not identical at one end of the transmission line or transformer, then the equipment with the higher rating is assumed to be open when developing the overall facility rating. [FAC-008-3 R6]


6.5.13 Short-term Emergency Rating, i.e. 30 minute ratings, may be established on a case-by-case basis on equipment that may experience an overload condition while predetermined mitigation steps are executed. Short-term Emergency Ratings and their corresponding time limits will only be established after a detailed review of equipment limitations and the documentation of appropriate automatic or operator-controlled mitigation steps designed to relieve the overload to within Normal Rating or Emergency Rating. Appropriate mitigation steps must be determined to be possible to be completed within the prescribed short-term time limit. All other short-term Emergency Rating shall be set equal to the existing Emergency Rating of the facility.

6.6 The Emergency Rating of the Transmission Facilities shall be used as the High Operating limit or High Alarm limit in the SCADA / EMS real-time systems. The High Warning limit in SCADA/EMS shall be the lesser of 90% of the High Alarm limit or the Normal Rating.

6.7 The applicable Facility Rating shall be modified to account for known operating limitations. Such limitations, in general, are applicable only on a short-term basis and only within an operational framework, such as the real-time SCADA / EMS systems. This includes temporary derating of impaired equipment consistent with good utility practice or temporary derating of a facility due to topology changes. [FAC-008-3 R2.2.4 & R3.2.4]

6.8 Other considerations may be taken into account to define the ampacity rating of facilities. Heat transfer from overhead conductor or rigid bus may be conducted to any attached equipment and equipment temperature limitations may be taken in account. Parallel conductors or busses in close proximity may adversely impact the ability to radiate heat and may be considered to reduce the rating an appropriate amount. Parallel conductors used as substation bus may have a mutual inductance between them that can result in an impedance imbalance and uneven loading thereby reducing the overall ampacity of the bus. Bus fittings and accessories must be properly installed in accordance with manufacturer’s recommendation to ensure that they do not limit Facility Ratings.

6.9 Under abnormal situations, winter ratings of the affected facilities can be used in the EMS, in the winter season, where applicable upon approval of the Director of Transmission and Generation System Operations. In such cases the associated EMS alarms shall be modified to accommodate the winter rating. Also in such cases the relay loadability per PRC-023 shall be verified to meet the new rating, or relay setting modifications shall be made to accommodate the winter rating. Upon return to normal operating conditions or change in season, the rating and the accompanying EMS alarms shall be returned to the original rating.


7.0 RECORDS

7.1 The Generating Facility Ratings are developed by Generation Reliability Engineering and are maintained on a secured network drive.

7.2 The Transmission System Facility Ratings are developed and maintained by System Planning on a secured network drive.


8.0 FORMS

8.1 None


9.0 ATTACHMENTS

9.1 Uniform Environmental Conditions Table

Conditions Input Units

Apparent Solar Time 1400 hours

Atmosphere Clear

Azimuth of Line 90 (E/W) degrees

Elevation (ft above sea level) 1155 ft

Emissivity 0.88

Latitude 35 N degrees

Solar Absorptivity 0.9

Temperature - Ambient Air - Summer 40 degrees C

Temperature - Ambient Air - Winter 10 degrees C

Temperature – Emergency 100 degrees C

Temperature – Normal 85 degrees C

Wind Angle 90 degrees

Wind Speed for Conductor 2 ft/sec

Wind Speed for Rigid Tubular Bus 3 ft/sec


9.2 Multi-Breaker Facility Layout Diagram


9.3 Single-Breaker Facility Layout Diagram


10.0 REVISION HISTORY

Effective Date:

Author(s): Approved By: Superseded Date:

Change History:

2/10/2017 Facility Ratings Method Team

John Olsen Bryan Jones

5/10/2016 Identified the point of demarcation between Generation and Transmission Facilities. Updated to include utilization of field verifications. Updated Generation bus 6.4.1 and conductor 6.4.3. Updated Transmission conductor 6.5.4.


Dave Benak Mark Mayworm John Olsen

5/14/2015 Updated references to SPP Criteria. Updated Responsibilities and Records for appropriate personnel. Updated Section 4.1. Added Section 6.5.4.2.


Dave Benak Mark Mayworm Tom Stuchlik

3/27/2014 Revised standard references throughout. Moved Isolated-phase and Rigid bus under a new 6.4.1 Bus subsection. Revised Section 6.5.4.1. Added Section 6.5.4.2.


Dave Benak Mark Mayworm Tom Stuchlik

09/06/2013 Revised Sections 6.4.6.2, 6.5.3.1, 6.5.13, 6.6, and 6.10. Added Sections 6.4.10 and 6.4.11. Removed Section 6.7. Added Generation Plant Support Engineering to Section 7.1.


Dave Benak Mark Mayworm

05/01/2013 Added Sections 4.13, 4.14, and 6.6. Removed Standards & Quality Assurance group from the Responsibilities section.


Dracy Jenkins Mark Mayworm

12/18/2012 Revised Sections 2.2 and 4.11; Added Sections 9.2 and 9.3: “Multi-Breaker Facility Layout Diagram” and “Single Breaker Facility Layout Diagram.”


Dracy Jenkins Mark Mayworm

01/01/2012 Updated to include references to FAC-008-3; Annual Review



Tom Stuchlik Dracy Jenkins Mark Mayworm

8/11/2011 - URP022-02 NERC FAC-008 Generation Facility Rating Methodology

3/22/2011 - System Planning Policy 0602

Combined System Planning Policy 0602 and URP022-02 NERC FAC-008 Generation Facility Rating Methodology

END

Documents

Westar Facility Ratings Method - OATI webSmartOASIS...2017/02/10 · 2.0 SCOPE 2.1 This method documents the technically sound principles for calculation of Normal and Emergency Facility