TADS Transmission Availability Data System August 1, 2012 Jeff Schaller, Hydro One, Vice-Chair of TADS Working Group
TADS Purpose The purpose ofthe Transmission Availability Data System Working Group (TADSWG) is to implement a uniform approach to reporting and measuring transmission availability, performance and other related reliability data. To meet this purpose, the TADSWG works on five key subjects: 1. Definition of transmission availability data that Transmission Owners (TOs) report to NERC 2. Single process for collecting such data dt that t avoids duplication of effort 3. Quality control process, data reviews and analysis to ensure metric numeric accuracy 4. Transmission availability and performance metrics that are calculated from the reported data 5. TO analysis and expertise to support the Performance Analysis Subcommittee (PAS) 2 RELIABILITY ACCOUNTABILITY
TADS to date Annual data collection from 192 Transmission Owners Transmission line ( 200kV) and transformer ( 200kV LV secondary) Phase 1 collection Automatic Outages started 2008 Phase 2 collection incremental Non automatic outages started ted 2010 0 (data a year) Improvement in Event Type part of Phase 2 implementation 3 RELIABILITY ACCOUNTABILITY
TADS to date Quantifies and substantiates focus on event causes: Protection Misoperations Human Error Equipment Failure Failed Human Error, 11% AC Substation and Circuit Equipment, 20% Lightning, g, 12% Failed Protection System Equipment, 8% Power System Condition, 4% NERC 2008 2011 AC Circuit Sustained Automatic Outages by Cause Codes Unknown, 14% Weather, excluding lightning, 17% Foreign Interference, 4% Other, 4% 4 RELIABILITY ACCOUNTABILITY
TADS to date TADS based metrics utilized in State of Reliability report (ALR metrics and indices) 5 RELIABILITY ACCOUNTABILITY
TADS to date Progress made on interpretation of statistically significant trends Automatic AC Circuit Outages Initiated by Failed AC Substation Equipment 0.031 0.029 NERC Single Mode AC Circuit Unpaired Poisson Analysis for ALR 6 13 0.027 0.025 0.023 0.021 Analysis indicates no statistically significant trend 0.019 0.017 Upper Bound of 90% Confidence Interval Average Outages per Circuit Lower Bound of 90% Confidence Interval 2008 2009 2010 2011 0.027 0.030 0.025 0.029 0.023 0.027 0.021 0.026 0.020 0.024 0.019 0.023 Estimated Mean Percent Change in Number of Outages per Year per Circuit Significance of Mean Change in Number of Outages per Year per Circuit 2009 2008 2010 2009 2010 2008 2011 2008 2011 2009 2011 2010 14% 20% 8% 9% 4% 19% NS * NS NS NS NS 6 RELIABILITY ACCOUNTABILITY
TADS Reports 7 RELIABILITY ACCOUNTABILITY
TADS Benefits Benefits to the Industry (NERC) Single, well defined event data collection system to assess reliability on a continental scale For the first time, provides a unified approach to measure system reliability Supports ALR metrics and Indices reported in State of Reliability Report Ability to assess effectiveness of Reliability Standards 8 RELIABILITY ACCOUNTABILITY
TADS Benefits Benefits to the Regions Provides performance baselines to enable identifying positive and negative trends within a Region Identifies differences among TOs within the Region Means of identifying major events within the Region 9 RELIABILITY ACCOUNTABILITY
TADS Benefits Benefits to the Transmission Owners Provides performance baselines at Continental, National and Regional levels enables TOs to compare their absolute and directional performance trends TADS data structure enables TOs the option to pursue more detailed comparisons available through the North thamerican Transmission i Forum 10 RELIABILITY ACCOUNTABILITY
TADS future Align with BES Definition (include 100 199kV) Consider/discuss: quarterly reporting 5 year sunset rule on non automatic outages Further explore common and dependent mode outages Further development on statistical significance of data Link with other data systems (e.g. GADS, DADS) Impact of Tx equipment outages Determine credible contingencies Bid Bridge gaps between bt operating studies and planning assumptions (improve TPL standards) 11 RELIABILITY ACCOUNTABILITY
Q Questions ti and d Answers A 12 RELIABILITY ACCOUNTABILITY