ACC Biennial Transmission Assessment

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ACC Biennial Transmission Assessment
2006 - 2015

• Ed Beck
• Superintendent, Planning
• Tucson Electric Power

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TEP EHV System Additions
Springerville
Westwing
Saguaro
North Loop
Tortolita
Greenlee
Winchester
TEP Service Area
Vail
South
Irvington
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138 kV System
Westwing
Saguaro
North Loop
Tortolita
Greenlee
Winchester
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UNS Electric (Citizens)

• Only change from 2004 to 2006 is a plan to
  upgrade the existing 115kV line to Nogales to
  138kV and connect to TEP Vail substation

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TEP Extreme Contingency

• Extreme contingency considered to be loss of all
  EHV transformers at a TEP substation (Tortolita,
  Vail or South)
• In 2008 each of TEPs EHV stations contained two
  transformers and TEP operates to survive N-2
• In 2015 Tortolita substation will have 3 EHV
  transformers study showed this also can be
  survived with direct load tripping

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N 1 - 1

• TEP operates using load Shed tables
• Fast switched reactive devices and/or direct load
  trip arming
• Studied TEP system with all generation on-line
  and N 2 conditions, all N 2 contingencies
  solved meeting TEP .98 p.u. voltage criterion
• TEP is working with SWTC on issues on their
  system

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SIL and MLSC
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Questions?