1. Review of Probabilistic Workshop held on September 9, 2014 Milorad Papic (RAWG Chair) Salt Lake City, January 13, 2015

2. OUTLINE 1.IEEE RRPA SC Structure 2.History on IEEE Std. 762 and 859 3.IEEE Std. 859 – An Overview 4.Present Activities on Std. 859 5.Participation in the Revision of Stds. 2

3. 1. RRPA SC Structure 3 Power System Analysis, Computing and Economics (PSACE) Committee Risk, Reliability and Probability Applications (RRPA) Subcommittee IEEE PES System Economics Subcommittee (SES) Computing & Analytical Methods Subcommittee (CAMS) Intelligent Systems Subcommittee WG on Probability Applications for Common Mode Events in Electric Power Systems (PACME WG) Distribution System Analysis Subcommittee (DSAS) TF on Reliability Impacts of Demand Response Integration (RIDRI) TF on Reliability Consideration in Emerging Cyber- Physical Energy Systems WG on LOLE Best Practices TF on Awards

4. 1. SC Membership 4 Leadership: –Chair: Milorad Papic, Idaho Power (USA) mpapic@dahopower.com mpapic@dahopower.com –Vice-Chair: Chris Dent, Durham University (UK) chris.dent@durham.ac.uk chris.dent@durham.ac.uk –Secretary: Masood Parvania, ASU (USA) parvania@gmail.com parvania@gmail.com –Past Chair: Andrew Ford, PJM (USA), andrew.ford@pjm.com andrew.ford@pjm.com SC objective: To study, review and foster the development, application and dissemination of probabilistic and other methods for dealing with reliability, uncertainty and risk assessment in the planning, design, operation and management of all phases of electric power systems. Membership: Total 54 members: – Industry 20 – Academics 30 – National Labs 1 – NERC 1 – Consultants 2

5. 2. History of IEEE Std. 762 and 859 RRPA SC is owner of IEEE Std. 762 and 859 IEEE Std. 762 was reaffirmed in 2011. IEEE Std. 859 was approved in 2008 so it will be due reaffirmation in 2017. Alex Schneider agreed to lead a WG to revise Std. 762 to cover non-dispatchable renewable generators such as wind farms. Chris Dent agreed to lead a WG to revise Std. 859 WG. Tom McDermott suggests setting up project authorization requests (PAR) for both Standards. IEEE standards now have a 10-year life, and there is no "reaffirm without change" as in the past. 5

6. 2. History of IEEE Std. 762 The initial work on Definitions associated with generation station equipment that can be used in the application of probability methods in system planning and operation started by Ad Hoc Working Group of APM Subcommittee started in 1968. IEEE Trial-Use Standard Definitions for Use in Reporting Electric Generating Unit Reliability, Availability and Productivity” was published in 1980 as a Trial-Use Standard 762-1980 ANSI/IEEE standard 762-1987 “IEEE Standard Definitions for Use in Reporting Electric Generating Unit Reliability, Availability and Productivity” published in May, 1987 6

7. 2. History of IEEE Std. 859 IEEE Standard 346-1973 “Definitions in Power Operations Terminology Including Terms for Reporting and Analyzing Outages of Electrical Transmission and Distribution Facilities and Interruption to Customer Service” was published in 1973. Performance Records for Optimizing System Design (PROSD) Working Group was created in 1978 to revise the Std. 346 but opted to eliminate terms related to distribution system facilities and interruptions from the document and focus on transmission facilities. The new revised standard is named as Std. 859 IEEE 859-1987 “IEEE Standard Terms for Reporting and Analyzing Outage Occurrences and Outage States of Electrical Transmission Facilities” published in July 1987 7

8. 2. History of IEEE Std. 859 The RRPA SC formed a WG at the 2005 GM in San Francisco to consider possible revision of IEEE Std. 859-1987. This WG was titled “IEEE Standard Terms for Reporting and Analyzing Outage Occurrences and Outage States of Electric Transmission Facilities” and chaired by Alex Schneider. After considerable discussion, the WG completed its work and recommended at the 2006 GM in Montreal that Standard 859-1987 be reaffirmed without change. The RRPA SC subsequently voted unanimously to recommend reaffirmation of the existing standard. It was reported by Andy Ford at the 2008 IEEE –PES GM in Pittsburgh that Std. 859-1987 was now reaffirmed and would stand for the next five years. The IEEE-SA Standards Board announced a new process on October 18, 2011 for maintaining active standards. This new process took effect on January 1, 2012. The major changes include extending the maintenance timeline of IEEE standards from five years to ten years and phasing out the reaffirmation and stabilizing processes by 2013. The focus is placed primarily on the revision process, and revision or withdrawal are the only available actions for maintaining active standards. In order to remain an active standard the RRPA SC is required to revise Std. 859-1987 by December 31, 2018. 8

9. 3. IEEE Std. 859 – An Overview 1.Purpose 2.Scope 3.Equipment Classifications 4.Component and Unit States and Events 5.State Times 6.Exposure Parameters 7.Outage Indices 9

10. 1. Purpose 10

11. 2. Scope 11

12. 3. Equipment Classification Component – Termination – Line Section Subcomponent – Line Segment Unit Terminal 12

13. 4. Component and Unit States and Events State – In Service State – Outage State Changes in State – Outage Occurrence – Outage Event Single Outage Event Multiple Outage Event Outage Initiation – Automatic Outage – Manual Outage Outage Type – Forced Outage – Scheduled Outage Failure 13

14. 5/6. States Times/Exposure Parameters 5. States Times State Times – Service Time – Outage Time – Reporting Period Time – Outage Duration 6. Exposure Parameters Exposure Parameters – Exposure (Time) – Exposure (Operations) – Weather 14

15. 7. Outage Indices Rate Indices – Outage Rate – Failure rate – Protective System False Operation Rate Duration Indices – Mean Time To Outage – Mean Outage Duration State Probability Indices – Availability – Unavailability Probability of Failure Indices – Probability of Failure to Open on Command – Probability of Failure to Close on Command – Probability of Failure to Operate on Command – False Operation Probability 15

16. 4. TADS Population Definitions 1.Element 2.Protection System 3. AC Circuit 4. Transformer 5. AC Substation 6. AC/DC Terminal 7. AC/DC Back-to-Back Converter 8. DC Circuit 16

17. 4. TADS Population Outage Definitions 1.Automatic Outage 2.Momentary Outage 3.Sustained Outage 4.Non-Automatic Outage 5.Planned Outage 6.Operational Outage 7.In-Service State 8.Substation, Terminal, or Converter Name 9.Outage Start Time 10.Outage Duration 11.Outage Identification (ID) Code 12.Normal Clearing 13.Normal Clearing Circuit Breaker Set (NCCBS) 14.Abnormal Clearing 15.Delayed Fault Clearing 16.Special Protection System (SPS) or Remedial Action Scheme (RAS) 17

18. 4. Outage Initiation Codes/Mode Codes Outage Initiation Codes Element-Initiated Outage Other Element-Initiated Outage AC Substation-Initiated Outage AC/DC Terminal-Initiated Outage Other Facility-Initiated Outage Outage Mode Codes Single Mode Outage Dependent Mode Initiating Outage Dependent Mode Outage Common Mode Outage Common Mode Initiating Outage 18

19. 5. Participation of NERC and WECC Representatives Members of NERC TADSWG Members of NERC GADSWG Members of WECC RS & RAWG Discussion on both IEEE Standards (762 and 859) will happened at RRPA Subcommittee Meeting in Denver, July 28 th, 2015. Does any member of RAWG plan to attend? 19

20. Questions? Milorad Papic Chair, Reliability Assessment Work Group mpapic@idahopower.com 20 W ESTERN E LECTRICITY C OORDINATING C OUNCIL