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RMR Exit for Spencer 5 – Remedial Action Plans

RMR Exit for Spencer 5 – Remedial Action Plans. Chris Ngai Jay Teixeira. Summary.

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RMR Exit for Spencer 5 – Remedial Action Plans

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  1. RMR Exit for Spencer 5 – Remedial Action Plans Chris Ngai Jay Teixeira Regional Planning Group

  2. Summary ERCOT staff analysis of the Spencer 5 exit from RMR status indicated that the Remedial Action Plans (RAPs) described herein would facilitate the unit’s RMR exit. Slide 3 contains a list of the six RAPs proposed as an RMR exit strategy for Spencer 5 with detailed descriptions of the RAPs in the subsequent slides. Review of the RAPs submitted by Oncor on April 14 is currently in progress. RAPs were revised to take into account current construction activity. This analysis was performed using the 2010 summer peak case; last updated on December 11, 2009.

  3. List of RAPs

  4. RAP 1 – Carrollton RAP • Problem 1 • Contingent element: Lewisville Switch (645)-Highland(664) • Overload element: Lewisville Switch (645)-Highland E 138kV(1970) line (Rate A/B/C: 214/214/214) • RAP operation: Open NW Carrollton (2361) – Lewisville Switch (646) 345kV and 138 kV lines • Level of overload: 117.8% Rate B (252.1MVA) • Estimated number of hours RAP would operate in year 2010: 613 hours

  5. RAP 1 – Carrollton RAP cont’d 613 hours Contingency: Lewisville Switch (645) to Highland E (1970) 138kV line Denton Overload element: Lewisville Switch (645) to Highland (664) 138kV line RAP action: Open the NW Carrollton (2361) – Lewisville Switch (646) 345kV line Roanoke NW Carrollton

  6. RAP 1 – Carrollton RAP cont’d • Problem 2 • Contingent element: Highland (664) - Canyon (668) • Oveload element: Lewisville Switch (645)-Highland E 138kV(1970) line (Rate A/B/C: 214/214/214) • RAP operation: Open the NW Carrollton (2361) – Lewisville Switch (646) 345kV and 138 kV lines • Level of overload: 101.9% Rate B (218.1MVA) • Estimated number of hours RAP would operate in year 2010:7 hours

  7. RAP 1 – Carrollton RAP cont’d 7 hours Denton Contingency: Highland (664) to Canyon (668) 138kV line Overload element: Lewisville Switch (645) to Highland E (1970) 138kV line RAP action: Open the NW Carrollton (2361) – Lewisville Switch (646) 345kV line Roanoke NW Carrollton

  8. RAP 2 – Lake Pointe RAP • Contingent element: Lewisville Switch (645)-Highland(664) • Overload element: Lewisville Switch 345/138kV autotransformer (Rate A/B/C: 700/700/700) • RAP operation: Open the line TNMP Lake Pointe (37010) – TNMP Lewisville (37080) • Level of overload: 113.3% Rate B (317.3MVA) • Estimated number of hours RAP would operate in year 2010:208 hours • Not needed in 2010 summer due to 138 kV line from Lewisville to NW Carrollton line being in case • May activate Arco RAP to handle Double Circuit contingency • Causes Collin to Frisco to overload

  9. RAP 2 – Lake Pointe RAP cont’d 208 hours Denton Contingency: Lewisville Switch 345/138kV autotransformer RAP action: Open the line TNMP Lake Pointe (37010) – TNMP Lewisville (37080) Overload element: Carrollton Northwest – Lake Pointe 138kV line NW Carrollton

  10. RAP 3 - Highland RAP • Contingent element: Coppell-Lewisville Switch • Overload element: Lewisville Switch (645)-Highland E 138kV(1970) 138kV line (Rate A/B/C: 214/214/214) • RAP operation: Open Lewisville Highlands (37050) – Lewisville West (37060) • Level of overload: 101.8% Rate B (217.8MVA) • Estimated number of hours RAP would operate in year 2010:10 hours • Coppell to Lewisville Switch contingency sectionalized to Lewisville Switch to Lewisville. • Overload element: Coppell Tap to McKamy Tap • May not related to Spencer RMR

  11. RAP 3 - Highland RAP cont’d 10 hours Denton RAP action: Open Lewisville Highlands (37050) – Lewisville West (37060) Overload element: Lewisville Switch (645) - Highland E (1970) 138kV line Contingency: Coppell to Lewisville Switch 138kV line NW Carrollton

  12. RAP 4 – Frisco RAP • Contingent element: Denton Steam – Corinth & Teasley - Pockrus • Overload element: Collins (2370) to Frisco (681) 138kV line (Rate A/B/C: 256/256/256) • RAP operation: • Raise the voltage of the West Denton 138kV side to 140kV • Modify the Collin Switch Reactor SPS so that it will operate when the Collin to Frisco line overloads. • If this does not resolve the overload, put all three capacitor banks at Navo in-service • Verify Argyle and Corinth capacitors are on • Level of overload: 109% Rate B (276.9MVA) • Estimated number of hours RAP would operate in year 2010:278 hours

  13. RAP 4 – Frisco RAP cont’d 278 hours Overload element: Collins (2370) to Frisco (681) 138kV line RAP action: put all three capacitor banks at Navo in-service Collin North Denton RAP action: Collin Switch Reactor SPS operates when the Collin to Frisco line overloads RAP action: Raise the voltage of the West Denton 138kV side to 140kV Spencer Contingency: Denton Steam auto-transformer to Corinth & Teasley to Pockrus 138kV line

  14. RAP 5 - Frisco Voltage RAP • Contingent element: Collin to Frisco 138kV line • Low voltage element: Frisco and Panther Creek bus • RAP operation: • Raise voltage at West Denton to 1.02~1.05 • adjust power factor/load • Level of overload: 0.8942 p.u. • Estimated number of hours RAP would operate in year 2010: • <0.92 p.u. – 584 hours (Brazos Criteria) • <0.90 p.u. – 90 hours (ERCOT Criteria)

  15. RAP 6 – Arco RAP • Cause • Carrollton RAP • Lake Pointe RAP • Overload element: Collin (2370) to Frisco (681) 138kV line (Rate A/B/C: 256/256/256) • RAP operation: Open Arco (1993) – Krugerville (1994)138kV line • Level of overload: • Carrollton RAP (line loadings refer to Collin to Frisco) • Problem 1 - 115.4% (239.4 MVA) after Carrollton RAP [pre RAP: 104.1% 266.4 MVA Collins SPS would relieve this but not after Carrollton RAP so should use Arco RAP instead]] • Problem 2 – 113.8% (291.4 MVA) after Carrollton RAP [pre RAP: 102.3% 262.0 MVA Collins SPS would relieve this but not after Carrollton RAP so should use Arco RAP instead]] • Lake Pointe RAP - 111.2% (284.6 MVA) after Lake Pointe RAP [pre RAP: 110.6% 283 MVA]

  16. RAP 6 – Arco RAP cont’d Same # of hours as Carrollton RAP & Highland RAP Krugerville Navo Overload element: Collins (2370) to Frisco (681) 138kV line Panther Creek Arco RAP action: Open Arco (1993) – Krugerville (1994)138kV line Collin Contingency: overload caused by Carrollton RAP and Lake Pointe RAP

  17. Permanent RMR Exit Solutions

  18. Questions?

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