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SWAT Short Circuit Study Group Update

SWAT Short Circuit Study Group Update. May 10, 2006 Albuquerque, New Mexico. Short Circuit – System Reliability. Relay Misoperations – Fail to Operate or Operate When They Shouldn’t Equipment Damage due to Failure to Operate Relays

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SWAT Short Circuit Study Group Update

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  1. SWAT Short Circuit Study Group Update May 10, 2006 Albuquerque, New Mexico

  2. Short Circuit – System Reliability • Relay Misoperations – Fail to Operate or Operate When They Shouldn’t • Equipment Damage due to Failure to Operate Relays • Circuit Breakers and Other Equipment Failure because not Properly Rated

  3. SWAT Short Circuit Working Group (SCWG) Accomplishments • Webpage setup and linked to SWAT Website • Charter (Scope) Finalized • All SWAT Transmission Owners joined • 4 meetings held since starting in January • Monthly meeting schedule • Impedance Map Plan Developed • Working on Combining First Case

  4. SWAT SCWG Webpage

  5. SWAT SCWG Webpage

  6. 4 Main Areas of Work • Impedance Maps • Annual Operating Case • Common Study Methodologies • Annual Standards Review

  7. SWAT SCWG Charter

  8. SWAT SCWG Webpage

  9. Meeting Locations • January 26, 2006 – WAPA - Phoenix • February 16, 2006 – TEP/UES – Tucson • March 16, 2006 – NPC/SPPC – Las Vegas • April 20, 2006 – SRP – Phoenix • May 18, 2006 – SWRTA – Casa Grande

  10. SWAT SCWG Webpage

  11. Impedance Maps Work • Most Impedance Maps Are Out of Date • List of Items to be Placed On Maps Developed • A Single Set of Impedance Maps to be Generated • Requested SWAT to Develop WestConnect Funding of Impedance Map Generation • Only 2 WestConnect Members not Members of SWAT SCWG

  12. SWAT Letter – 3/24/06

  13. SWAT Response – 4/16/06

  14. SWAT SCWG Webpage

  15. SWAT SCWG Participants

  16. STEP SCWG Proposal

  17. Member Programs • APS - Cape • SRP – Aspen • WAPA – PTI and Aspen • TEP/Unisource – Aspen • SWTC – Aspen • IID – Aspen • EPE – Aspen • PNM – Aspen • NPC/SPPC – Aspen

  18. SWAT SCWG Webpage

  19. DPV2 SCWG Findings • 442 of 1481 buses with 10 A or higher difference • Some Transformers not Modeled as Transformers in the DPV2 SCWG PSS/E case • Type 2 Buses in PSS/E Do Not Stay Constant

  20. DPV2 PSS/E Converted Aspen Worst Differences

  21. Combined Case • Plan Developed • Conversions Currently being Checked • Zones for Members being Developed • Equivalents to be Checked • Cases to be Combined

  22. Future Work • Combine CCPG SCWG Case • Combine STEP SCWG Case (if developed) • Develop Common Methodologies • Review of Standards • Start on next Annual Case and Impedance Maps Update (refinements)

  23. Future Refinements • Add Mutual Coupling • Add Line Charging Capacitance • Add Motors • Check Transformer, Line, Shunt, Generator, and Load Data

  24. Refinement Example: Line Charging Capacitance

  25. Potential Load Flow Help • Impedance Maps for Load Flow Operating Case • Possible WECC Evolution of Regional SCWGs • If WECC Bus Numbers Used Later, Import of More Accurate SC Case Data into Load Flow Cases

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