SWAT Short Circuit Working Group Update

1
SWAT Short Circuit Working Group Update

• August 16, 2006
• Tri-State GT Offices
• Westminster, Colorado

2
SWAT Short Circuit Working Group (SCWG)
Accomplishments since May SWAT Update

• 7 meetings held since starting in January
• Impedance Map Funding Proposal developed
• Conversion checking of DPV2 case completed (for
  Cape and Aspen)
• All PTI problems in DPV2 case conversion
  identified
• Plan for combining cases developed

3
Meeting Schedule

• 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
• June 15, 2006 WAPA Phoenix
• July 20, 2006 PNM Albuquerque
• August 17, 2006 APS Phoenix

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Meeting Minutes and Presentations
5
Impedance Map Development

• Proposal Developed by the Group
• SWAT Requested document to be referenced as Draft
• SWAT Requested Cost Estimate
• Cost Estimate Developed
• SWAT Requested clarification of SWRTA
• Awaiting full Clarification of SWRTA

6
Impedance Map Proposal
7
Impedance Map Cost Estimate

• Low labor cost 45/hour new engineer or
  draftsman
• High labor cost 125/hour consultant
• Low labor cost max time estimate 6 months
• High labor cost max time estimate 4 months
• 6moX4wk/moX40hr/wkX45/hr43,200
• 4moX4wk/moX40hr/wkX125/hr80,000
• Range 45,000 to 80,000

8
DPV2 Case Conversions

• 2 Changes made to Aspen
• 1 Change made in Cape (for different case)
• 1 Change needed in Aspen or Cape
• All buses in Cape and Aspen less than 100 A
  difference
• One of the Aspen changes for PTI conversion
• Cape identified some problems found due to data
  entry

9
Plan for Case Combining

• New Process will be quick in the future
• Distributed work to members
• All members to identify and change areas and
  zones
• Tie buses to have common numbers and names
• Error checking of the cases
• Checking of equivalent methods
• Combine the cases

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Distributed Combining Schedule

• Each member to combine 2 cases
• 3 members stated they did not have resources
  (time) to do this
• 1 member will have to combine 2 cases twice
  (volunteer for this not known yet)
• Each combination has bus renumbering when
  duplicates
• Each combination has checking of results
• Each combination includes SWAT boundary
  equivalents

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SWAT SCWG Current Work

• Error Checking Cases
• Adding Areas and Zones for combining
• Changing tie bus numbers
• Equivalents being checked

12
Common Tie Data
13
SWAT SCWG Future Work

• Finish error checking cases
• Finish all area and zone entries
• Finish all common tie bus number entries
• Finish equivalents checking
• Combine the cases
• Common Impedance Maps to be developed
• Combine case with CCPG Short Circuit Database
  Group Case
• Develop common study methodologies
• Standards Review
• Combine case with STEP SCWG case when formed
• Present SCWG proposal to NTAC

14
Other Items
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Other Items

• WECC RWG SWAT members identified
• Alberta ISO requested information
• IEEE Switchgear SWAT members identified
• IEEE PSRC SWAT members to be identified
• NPC/SPPC Short Circuit Planning Study Group to be
  started (East Valley)

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Website address

• http//www.oatioasis.com/WALC/WALCdocs/page1.htm