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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

SWAT Short Circuit Study Group Update

May 10, 2006

Albuquerque, New Mexico


Short circuit system reliability
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


Swat short circuit working group scwg accomplishments
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 main areas of work
4 Main Areas of Work

  • Impedance Maps

  • Annual Operating Case

  • Common Study Methodologies

  • Annual Standards Review




Meeting locations
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



Impedance maps work
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  • Most Impedance Maps Are Out of Date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







Member programs
Member Programs

  • APS - Cape

  • SRP – Aspen

  • WAPA – PTI and Aspen

  • TEP/Unisource – Aspen

  • SWTC – Aspen

  • IID – Aspen

  • EPE – Aspen

  • PNM – Aspen

  • NPC/SPPC – Aspen



Dpv2 scwg findings
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



Combined case
Combined Case

  • Plan Developed

  • Conversions Currently being Checked

  • Zones for Members being Developed

  • Equivalents to be Checked

  • Cases to be Combined


Future work
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)


Future refinements
Future Refinements

  • Add Mutual Coupling

  • Add Line Charging Capacitance

  • Add Motors

  • Check Transformer, Line, Shunt, Generator, and Load Data



Potential load flow help
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