Path Rating Catalog 2013 - Western Electricity Coordinating Council

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31. TOT 2A Revised January 2013 Accepted Rating Existing Rating Other Location: Definition: Transfer Limit: Extreme Southwest Colorado Sum of the flows on the following transmission lines: Line Metered End Waterflow-San Juan 345 kV San Juan Hesperus-Glade Tap 115 kV Glade Tap Lost Canyon-Shiprock 230 kV Shiprock North to South: 690 MW minus net load in the Montrose-Curecanti-San Juan-Shiprock area of southwest Colorado. The load itself ranges 140-290 MW, and internal thermal generation can be 100 MW and hydro generation can be 15 MW. However, the maximum rating is 690 MW. South to North: Not defined Critical Disturbance that limits the transfer capability: When: System Conditions: Study Criteria: Depending on local load and generation levels, the real-time rating ranges between a maximum of 690 MW and a minimum of 320 MW. Typically, the real-time rating centers around 520 MW. The critical disturbance is the outage of the 345 kV system between Montrose and San Juan. The limiting elements are low voltages or emergency overloads on the local 115 kV system, or emergency overloads on local 230/115 kV or 345/115 kV transformers. The specific outage and limiting element depend on load levels and generation patterns. The rating was established jointly by Colorado-Ute Electric Association (CUEA) and Western Area Power Administration (WAPA)-Montrose, in 1989. This rating is independent of transfer levels between major areas of WECC although the actual flow is heavily impacted by inadvertent. The transfer limit is impacted by local area generation and load levels. Historically, the flows have been predominately north to south across the path, although flows south to north have been experienced. (Summary) System intact: • Per unit voltages between 0.95 p.u. and 1.05 p.u. • All lines and transformers loaded to less than continuous rating. Single contingency outage conditions: • Per unit voltages between 0.90 p.u. and 1.10 p.u. • All lines loaded to less than 15-minute emergency ratings. • All transformers loaded to less than 30-minute emergency ratings. • Transient voltage swings down to 0.7 p.u. permitted. • Voltage deviation criteria for Tri-State loads PART VI Item 1-88
Revised January 2013 Remedial Actions Required: Formal Operating Procedure: Allocation: Interaction w/Other Transfer Paths: Contact Person: Remedial action schemes are required to achieve the rated transfer capability. Following an outage, all overloaded lines and transformers must have their loadings reduced to continuous ratings within 15 minutes. This is accomplished by reducing schedules, lowering local generation or manually tripping a lower voltage parallel path. For overloading on the Nucla-Cahone 115 kV line, which could be due to the Montrose-Hesperus 345 kV or Curecanti-Lost Canyon 230 kV contingencies, among others, the Montrose-Nucla 115 kV transmission line may be automatically tripped depending on the loading on the Nucla-Cahone 115 kV line. This automatic transfer trip scheme is normally enabled. If it is disabled, then real-time transfer capability limits are calculated using local load and local generation as input variables. There is a formal operating procedure dated September 14, 2011. WAPA- Loveland is the operating agent and uses real-time flows to monitor the path. The transfer capability of the path is divided between WAPA, Public Service Company of Colorado and Tri-State G&T. None Frank Li Western Area Power Administration Rocky Mountain Region P.O. Box 3700 Loveland, CO 80539-3003 (970) 461-7363 (970) 461-7423 - fax yli@wapa.gov PART VI Item 1-89
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Document Title File Name Category 2
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WECC PATH RATING CATALOG Disclaimer
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holding rights on the path. Additio
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EXPLANATION OF TERMS Path Name Acce
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III-2. Palo Verde-Devers #2/ 212 II
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WECC Transfer Paths PART VI Item 1-
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Revised February 2005 1. Alberta -
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Revised November 2008 Allocation: I
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2. Alberta - Saskatchewan Revised F
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Revised January 2013 3. Northwest -
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Contact Person: Guihua Wang British
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Revised January 2013 4. West of Cas
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Revised January 2006 5. West of Cas
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Revised December 2011 Contact Perso
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6. West of Hatwai Revised December
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7. Deleted February 1998 INTENTIONA
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8. Montana to Northwest Revised Jan
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9. West of Broadview Revised Januar
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10. West of Colstrip Revised Januar
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Revised January 2013 Interaction w/
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11. West of Crossover Revised Janua
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12. Deleted February 2002 INTENTION
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14. Idaho to Northwest Revised Janu
Page 47 and 48: Revised January 2013 System Conditi
Page 49 and 50: 15. Midway - Los Banos Revised Febr
Page 51 and 52: Revised January 2011 Contact Person
Page 53 and 54: 16. Idaho - Sierra Revised December
Page 55 and 56: 17. Borah West Revised January 2013
Page 57 and 58: Revised January 2010 Interaction w/
Page 59 and 60: 18. Montana - Idaho Revised January
Page 61 and 62: 19. Bridger West Revised January 20
Page 63 and 64: Remedial Actions Required: Formal O
Page 65 and 66: 20. Path C Revised January 2013 PAR
Page 67 and 68: Revised January 2013 Interaction w/
Page 69 and 70: Revised February 2005 22. Southwest
Page 71 and 72: Revised December 2010 Allocation: I
Page 73 and 74: Revised February 2003 23. Four Corn
Page 75 and 76: Contact Person: Barrie Kokanos, PhD
Page 77 and 78: 24. PG&E - Sierra Revised February
Page 79 and 80: 25. PacifiCorp/PG&E 115 kV Intercon
Page 81 and 82: Study Criteria (continued) Remedial
Page 83 and 84: Revised February 2007 26. Northern
Page 85 and 86: Revised February 2003 27. Intermoun
Page 87 and 88: System Conditions: The Accepted Rat
Page 89 and 90: Revised January 2013 28. Intermount
Page 91 and 92: Revised February 2003 29. Intermoun
Page 93 and 94: Revised November 2007 Contact Perso
Page 95 and 96: 30. TOT 1A Revised December 2012 Ac
Page 97: 31. TOT 2A Revised January 2013 PAR
Page 101 and 102: Revised February 2005 32. Pavant -
Page 103 and 104: 33. Bonanza West Revised December 2
Page 105 and 106: 34. SEE PATHS 78 AND 79 PART VI Ite
Page 107 and 108: Revised January 2013 35. TOT 2C (Pa
Page 109 and 110: 36. TOT 3 Revised January 2013 Acce
Page 111 and 112: Created on 8/10/10 TABLE 1-1A: TOT3
Page 113 and 114: 37. TOT 4A Revised January 2012 Acc
Page 115 and 116: PART VI Item 1-105
Page 117 and 118: 38. TOT 4B Revised January 2012 Acc
Page 119 and 120: WYOMING SYSTEM OPERATING CURVE SYST
Page 121 and 122: 39. TOT 5 Revised January 2013 Acce
Page 123 and 124: 40. TOT 7 Revised February 2003 PAR
Page 125 and 126: Revised January 2006 Allocation: In
Page 127 and 128: 41. Sylmar to SCE Revised February
Page 129 and 130: 42. IID - SCE Revised February 2004
Page 131 and 132: 43. North of San Onofre Revised Jan
Page 133 and 134: 44. South of San Onofre Revised Feb
Page 135 and 136: 45. SDG&E - CFE Revised December 20
Page 137 and 138: Revised February 2003 46. West of C
Page 139 and 140: Revised February 2007 Allocation: N
Page 141 and 142: Revised January 2006 47. Southern N
Page 143 and 144: Revised February 2007 48. Northern
Page 145 and 146: Revised January 2010 Allocation: In
Page 147 and 148: Revised January 2013 49. East of th
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Revised January 2013 Utah Navajo Pa
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50. Cholla - Pinnacle Peak Revised
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51. Southern Navajo Revised Februar
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Revised December 2010 Contact Perso
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Revised February 2003 52. Silver Pe
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53. Deleted March 2007 INTENTIONALL
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Revised December 2010 54. Coronado-
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55. Brownlee East Revised January 2
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Revised February 2003 58. Eldorado
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Revised February 2003 59. WALC Blyt
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Revised February 2003 60. Inyo - Co
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Revised February 2003 61. Lugo - Vi
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62. Eldorado - McCullough 500 kV Li
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63. Deleted January 2011 INTENTIONA
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Revised February 1998 65. Pacific D
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Revised February 1998 Study Criteri
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66. COI Revised January 2013 PART V
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Revised January 2013 Remedial Actio
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71. South of Allston Revised Januar
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73. North of John Day Revised Decem
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Revised January 2013 75. Hemingway
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76. Alturas Project Revised Februar
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Revised February 2002 Contact Perso
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77. Crystal - Harry Allen Revised N
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78. TOT 2B1 Revised January 2013 Ac
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79. TOT 2B2 Revised January 2013 Ac
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80. Montana Southeast Revised Janua
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81. Centennial Revised November 200
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82. TotBeast Revised January 2013 P
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Revised January 2013 Formal Operati
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III-1. Devers-Palo Verde #2 Path 49
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Revised November 2007 System Condit
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Revised November 2007 III-2. Palo V
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Updated November 2007 III-3. Montan
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simultaneous analysis, only heavy s
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III-4. Path C (Post Gateway) Revise
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Revised January 2011 Interaction w/
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III-5. Aeolus South Project Added J
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Added January 2013 III-6. Aeolus We
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Added January 2013 III-7. Bridger/A
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III-9. TOT 4A (Pre-Gateway) Revised
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Contact Person: Craig Quist PacifiC
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Added January 2013 III-10. TOT 4A (
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III-11. TOT 4B (Pre-Gateway) Revise
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Operating operating agent and uses
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III-12. SunZia Southwest Transmissi
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Contact Person Mark L. Etherton, P.
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Revised January 2013 Formal Operati
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Revised January 2013 Allocation: In
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January 2013 III-15. TotBeast with
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January 2013 III-16. Idaho to North
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January 2013 Study Criteria: Remedi
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Revised January 2013 III-17. TOT3 A
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Remedial Actions Required: Formal O
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Phase II Projects PART VI Item 1-25
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Revised December 2010 II-1. Navajo
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Added January 2010 II-3. TransWest
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II-5. Path 45 Uprate Project Revise
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Contact Person: Ing. Jesús Moya Je
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Added February 2010 II-6. Southwest
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Intertie, Normally Close) Interacti
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II-8. IID - SCE March 2013 Accepted
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II-9. IID - SCE March 2013 Accepted
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Path Rating Catalog 2013 - Western Electricity Coordinating Council

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