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SWEDE - April 27th, 2012 - GalvestonTommy Nylec
Austin EnergyAustin EnergySpacer Cable ApplicationSpacer Cable Application
Austin EnergyAustin EnergySpacer Cable ApplicationSpacer Cable Application
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OverviewOverviewOverviewOverview
Introduction to Austin Energy
Spacer Cable Description
Applications Operational Concerns
Future Work and Conclusions
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Austin Energy StatisticsAustin Energy StatisticsAustin Energy StatisticsAustin Energy Statistics
>400,000 Customers >2,800 MW Generation > 50 Distribution
Substations > 10,000 miles of
Distribution >1,600 Employees Serve 437 square miles
including Austin city limits and neighboring areas
Started in 1887
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Austin Energy’s Operational ViewAustin Energy’s Operational ViewAustin Energy’s Operational ViewAustin Energy’s Operational View
City Council is Board of Directors
Citizens equivalent to Investors/Members
Public Opinion drives utility direction
Alternative Energy Initiative
Integrate nature into city
Goal to become compact city
City ordinances
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Spacer Cable IntroductionSpacer Cable IntroductionSpacer Cable IntroductionSpacer Cable Introduction
Spacer cable is a messenger supported primary distribution system using covered conductors in a close triangular configuration. The system has the mechanical strength to weather severe storms and the electrical strength to prevent faults due to phase to ground or phase to phase contact, tree contact or animal contact.
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Cable DetailsCable DetailsCable DetailsCable Details
Messenger Supports conductors and maintains phase spacing Messenger supports the spacers and conductors and
may be used as system neutral. Messengers up to 4/0 AWG equivalent conductivity
are available Shields system from lightning strikes Special messengers available for long spans Conductor Available in various voltages & sizes High density polyethylene (gray or black) UV resistant Track resistant Long leakage distance, self-washing design allows
operation with contamination
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Spacer DetailsSpacer DetailsSpacer DetailsSpacer Details
Voltage
Dimensions (in)
Conductor Spacing (in)
Messenger Range (in)
Cable Range (in)Max System
Voltage (kV)
Short Circuit Rating
(kA)Weight (lbs)
D E AN AC BC
15 kV 16.5 23.5 8.5 8 8 10.75 .375-.750 .438-2.00 13.5 2.5
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Bracket DetailsBracket DetailsBracket DetailsBracket Details
Voltage
Dimensions (in)
Minimum Ultimate Load (lbs) V1 (vertical)Weight
(lbs)A B
15 kV 8 14 3200 8.6
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Spacer Cable ApplicationSpacer Cable ApplicationSpacer Cable ApplicationSpacer Cable Application
Heavily wooded or trimming limitations ROW or property line boundaries
Clearance concerns Under built facilities
Multiple circuits Critical reliability
Sensitive environmental areas Long span distances
Public request for fewer poles
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Designing with Spacer CableDesigning with Spacer CableDesigning with Spacer CableDesigning with Spacer Cable
Pole loading can be reduced Conceptually similar to overhead fiber
design Requires unique sag and tension tables Technical design guides available PLS-CADD data for modeling purposes Turnkey services available from vendors
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Spacer Cable InstallationSpacer Cable InstallationSpacer Cable InstallationSpacer Cable Installation
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Tangent FramingTangent FramingTangent FramingTangent Framing
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Dead End FramingDead End FramingDead End FramingDead End Framing
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Angle FramingAngle FramingAngle FramingAngle Framing
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Tap ConnectionsTap ConnectionsTap ConnectionsTap Connections
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Installation ExamplesInstallation ExamplesInstallation ExamplesInstallation Examples
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River Crossing ExampleRiver Crossing ExampleRiver Crossing ExampleRiver Crossing Example
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River Crossing ExampleRiver Crossing ExampleRiver Crossing ExampleRiver Crossing Example
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Dead End Framing ExampleDead End Framing ExampleDead End Framing ExampleDead End Framing Example
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Tree Trimming ImpactTree Trimming ImpactTree Trimming ImpactTree Trimming Impact
Reduces vegetation management costs due to extending cycles through smaller footprints
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Spacer Cable Operational ObservationsSpacer Cable Operational ObservationsSpacer Cable Operational ObservationsSpacer Cable Operational Observations
Prevents faults caused by incidental contact
Requires special tools and techniques Very difficult to remove covering Allows taps without additional hazards
sometimes created by vertical construction
Treat as uninsulated when being worked
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Spacer Cable Technical BenefitsSpacer Cable Technical BenefitsSpacer Cable Technical BenefitsSpacer Cable Technical Benefits
Designed to prevent storm related outages
Compact design High mechanical
strength Lightning shield wire Less voltage drop
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Initial Cost versus O&M SavingsInitial Cost versus O&M SavingsInitial Cost versus O&M SavingsInitial Cost versus O&M Savings
+Material more expensive than standard construction
+Can be more labor intensive until familiar with equipment
- Reduction of tree trimming expenses
- ROW acquisition costs reduced
- Messenger use requires less structurally significant poles
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Spacer Cable at Austin EnergySpacer Cable at Austin EnergySpacer Cable at Austin EnergySpacer Cable at Austin Energy
Initially used for long spans for river crossings and long highway crossings
Still primary use Beginning to investigate use for zero lot
line & tree trimming reduction 795 only option w/ 4/0 equivalent
neutral
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SummarySummarySummarySummary
Advantages Great for long spans Can reduce tree trimming Can use shorter poles Great for multiple circuits or existing ROW Very reliable
Disadvantages Higher initial costs versus standard overhead lines Pole breaks before messenger Difficulty during install or reinstall Not always supported by line workers
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Questions?Questions?Questions?Questions?
Additional technical information can be found at http://www.pesicc.org