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Toronto Hydro-Electric System Public Infrastructure Engineering Vulnerability Assessment Pilot Case Study

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Toronto Hydro-Electric System Public Infrastructure Engineering Vulnerability Assessment Pilot Case Study Planning, Clean Air Partnership, in partnership with Environment and Toronto Hydro-Electric System Engineers Canada Resources Toronto Hydro-Electric System Public Infrastructure Engineering Vulnerability Assessment Pilot Case Study Electrical Distribution Infrastructure Final Report 60263582 September 21st, 2012 AECOM All rights reserved. AECOM Toronto Hydro-Electric System PIEVC Pilot Case Study Acknowledgements AECOM would like to acknowledge the funding contributions of Natural Resources Canada and Engineers Canada which made this project possible. The Toronto region’s WeatherWise Partnership is also acknowledged for its work on bringing the issue of climate related threats on electrical infrastructure to the forefront, and for its efforts in bringing about this study. AECOM would like to thank the Clean Air Partnership and Engineers Canada for the opportunity to undertake this study. AECOM would also like to acknowledge Toronto Hydro-Electric System staff for their time and effort in gathering the necessary inputs and providing insight into the characteristics and functionality of their equipment. Without their valuable contributions, this study could not have proceeded. Interim Report, rev. 3 – July 2012 ii AECOM Toronto Hydro-Electric System PIEVC Pilot Case Study Table of Contents Acknowledgements .................................................................................................................. ii 1 Introduction .................................................................................................................. 1 1.1 Project Background .................................................................................................................. 1 1.2 Project Scope and Objective .................................................................................................... 1 1.3 Project Team .............................................................................................................................. 2 2 Infrastructure ............................................................................................................... 4 2.1 Feeder Systems ......................................................................................................................... 4 2.1.1 Area A Station Feeders............................................................................................................................ 4 2.1.2 Area B Station Feeders............................................................................................................................ 5 2.1.3 Area C Station Feeders............................................................................................................................ 6 2.2 Components............................................................................................................................... 9 2.2.1 Primary Conductors ................................................................................................................................ 9 2.2.2 Switches ................................................................................................................................................. 10 2.2.3 Transformers .......................................................................................................................................... 11 2.2.4 Network Units ......................................................................................................................................... 11 2.2.5 Vaults ...................................................................................................................................................... 12 2.2.6 Poles ....................................................................................................................................................... 13 2.3 Time Horizon ............................................................................................................................ 14 2.4 Jurisdictional Considerations ................................................................................................ 15 2.5 Other Potential Changes that May Affect Infrastructure ..................................................... 16 2.6 Data Sufficiency ...................................................................................................................... 16 3 Climate Analysis ........................................................................................................ 17 3.1 Climate Parameters and Thresholds ..................................................................................... 17 3.2 Standardized Probability Scoring .......................................................................................... 18 3.3 Data Sufficiency ...................................................................................................................... 19 4 Risk Assessment ....................................................................................................... 20 4.1 Preparation for the Risk Assessment Workshop ................................................................ 20 4.1.1 Risk Assessment Methodology ............................................................................................................ 20 4.1.2 Relevant Infrastructure Performance Responses ............................................................................... 21 4.1.3 Yes/No Weather – Infrastructure Interaction Screening ..................................................................... 21 4.2 Risk Assessment Workshop .................................................................................................. 21 4.3 Assessment Results ............................................................................................................... 22 4.3.1 General.................................................................................................................................................... 22 Interim Report, rev. 3 – July 2012 iii AECOM Toronto Hydro-Electric System PIEVC Pilot Case Study 4.3.2 Low Risk ................................................................................................................................................. 23 4.3.3 Medium Risk ........................................................................................................................................... 25 4.3.4 High Risk ................................................................................................................................................ 26 4.3.5 Special Cases – High Severity, Low Probability Events ..................................................................... 26 4.3.6 Special Cases - Low Severity, High Probability Events...................................................................... 26 5 Preliminary Conclusions ........................................................................................... 29 5.1 Findings and Limitations ........................................................................................................ 29 5.2 Additional Work ....................................................................................................................... 30 List of Tables Table 1.1 Project Team Members .............................................................................................................................. 2 Table 2.1 Feeder Loading and Performance Characteristics ..................................................................................... 7 Table 2.2 Useful Design Life .................................................................................................................................... 14 Table 2.3 Asset Date of Installation .......................................................................................................................... 15 Table 3.1 Climate Events and Thresholds for Pilot Case Study .............................................................................. 17 Table 3.2 Protocol Probability Scoring Scale ........................................................................................................... 19 Table 4.1 Protocol Severity Scoring Scale with Electrical Distribution Examples .................................................... 20 Table 4.2 Reference Risk Tolerance Thresholds ..................................................................................................... 20 Table 4.3 Organizations and Experience Present at the Workshop ........................................................................ 22 Table 4.4 Summary Current Weather Related Risks to Electrical Distribution Infrastructure .................................. 28 List of Figures Figure 2.1 Schematic of Area A Feeders A-1, A-2 and A-3 ....................................................................................... 5 Figure 2.2 Schematic of Area B Feeders B-1 and B-2 ............................................................................................... 6 Figure 2.3 Schematic of Area C Feeders C-1 and C-2 .............................................................................................. 7 Figure 2.4 Underground Cables ................................................................................................................................. 9 Figure 2.5 Switches .................................................................................................................................................. 10 Figure 2.6 Transformers ..........................................................................................................................................
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