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Background

Grizzly-Summer Lake 500 kV Line Planned Outage May 27-June 15 2008 1900-2400 hours Mike Viles – BPA Transmission Operations Technical Management Team June 4, 2008. Background.

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Background

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Presentation Transcript

  1. Grizzly-Summer Lake 500 kV LinePlanned OutageMay 27-June 15 20081900-2400 hoursMike Viles – BPA Transmission OperationsTechnical Management TeamJune 4, 2008

  2. Background • A continuous outage of sections of the Grizzly-Summer Lake line had been planned for spacer damper replacement for May 27 – June 15 • A planned outage of this line is hard to get because: • It significantly reduces the California-Oregon Intertie (COI) capability • OTC reduces from above 4000 MW to 2800 MW north to south to protect for the next double contingency • Ponderosa 500/230 kV transformer forced out of service and creates potential load service issues except during lighter load conditions • Late spring loads are lighter due to mild temperatures compared to winter and summer loads

  3. G Legend JOHN DAY SLATT 230kV 500kV O/S BUCKLEY MARION Cascades ALVEY GRIZZLY SAME CORRIDOR DIXONVILLE PONDERSOA CENTRAL OREGON LOAD MERIDIAN KLAMATH COGEN G SUMMER LAKE IDAHO CAPT JACK MALIN OREGON-CALIFORNIA INTERTIE OLINDA ROUND MTN

  4. Outage • In early May it was decided to cancel this line outage due to concerns about the impact of the outage on the COI with a late runoff • Work to replace gun shot insulators, repair conductor and repair overhead ground wire on the line had also been planned • There was a need to get that work done to prevent an unplanned outage of the line • There would not be another window of opportunity to take a planned outage of this line in 2008

  5. Damaged Insulator String

  6. Repairing Insulator String

  7. Outage • Daily outages from 1900 to 2400 hours were coordinated to minimize the impact of the outage • All the repairs that are needed can be done during this 20 day period • Some of the work is being done during darkness so only the local line crew that is familiar with the terrain is willing to do the work

  8. Outage Impacts • The COI OTC is reduced to 2800 MW • The next slide shows the actual COI flow versus the scheduling limit which is lower than the OTC • The PDCI is allowed to go to full 3100 MW capacity during the outage

  9. COI Actual Flow vs Scheduling Capacity

  10. The End

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