Stacy's SW Section Presentation final (1)€¦ · Title: Microsoft PowerPoint - Stacy's SW Section...
Transcript of Stacy's SW Section Presentation final (1)€¦ · Title: Microsoft PowerPoint - Stacy's SW Section...
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Electrical System Reliability
Presented by Stacy Cheevers,Plant Manager
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Terms
Distribution Line: 13,200 volts Transmission Line: 69,000 volts Sub Station: Outdoor structure where voltage is stepped
down or up Switching station: power is only switchedMetal Clad Switchgear: High voltage (13.2kv) breakers Recloser: Circuit breaker in a sub station
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Customer to rural COOPSingle feed to plantOutdated and undersized
substation
BWD Electrical System
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1985 BWD electrical fire caused rationing
1986 BWD staff had concerns for the reliability of the electrical system
History
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System Improvements
1987 electrical upgrade Allgeier Martin1st 480v generator and emergency connection for
intake1st underground high voltage feedersNew Switching Station #1
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Need for WTP expansion
1989 conducted interviews for consultant for a 40MGD Plant Expansion
MWH new design engineersVery competent electrical engineerBrought in a new concept: true redundant powerEmphasis put on redundancy and robustness
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Combined effort BWD and MWH push CEC for more reliable source
2000 addition of three 2MW generators and underground feed to intake
Allowed for load more efficient shedding program
Next Phase
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2004 CEC built Beaver Sub
BWD sold a corner tract at minimal cost
2005 added SS1A and 2nd
feed (underground) to a 2nd intake structure
Multi Phase Expansion
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New SUB Adjacent to Plant
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2005 New 60MDG Plant 2006 Reconfigured
generators to feed SS#1 2008 2nd 69kv line to
Beaver Sub to complete loop
Multi Phase Expansion
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Elm Springs
Prairie Creek
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Elm Springs
Prairie Creek
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Switching Station Pro
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Overhead Cons
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Underground Pros and Cons
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Very reliable system Very complicated Takes a high skill level to
operate and maintainAssures we are prepared
to stay up and running
Current System
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2015 Adding additional generator capacity to ensure an average day’s need can be met
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Where We Came From
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Where We Are Now
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Intakes
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After Significant upgrades or changes need for updated coordination study
Revise plant one-linesUpdate Arc Flash program
Don’t overlook
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Several Small 480V Generators on AutoStart
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BWD has 3 Electricians certified in Thermography
Looking into Ultrasonic detection
Performs Extensive Preventive Maintenance
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Replacement
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What’s Next
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Questions?