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


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


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


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


Damaged Insulator String


Repairing Insulator String


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


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


COI Actual Flow vs Scheduling Capacity


The End


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