69kv project replacing w/ htls conductors€¦ · 6/21/2019 power line systems, inc. 1 69kv project...
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1 Power Line Systems, Inc. 6/21/2019
69KV Project Replacing w/ HTLS Conductors
Ryan “Ralphie” Adams Arizona Public Service
2019 PLS‐CADD Advanced Training and User Group
by
IT’S ALL ABOUT YOUR POWER LINES Power Line Systems
IT’S THE SOLUTION
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69kV Conductor Upgrade Project (AA ACSS ”ish”)
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– 2 miles of double circuit 69kV for upgrade • No structures are to be replaced...??? • Only conductor to be replaced for upgrade • OPGW installation requested also...
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EAST Section
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WEST Section
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Structure Modeling
– Towers • 1960’s vintage Generation
Station Towers • 1970’s vintage Tangent
and DE Towers – Tower drawings difficult to
find and limited in model detailing
– PJ Ford • Tower modeling support
– Ongoing engineering support for remediation activities...
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Structure Modeling
– Poles • Existing Steel and wood pole structures
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Conductor Type Selection
– Normal upgrade conductor = 795 “Tern” ACSS • does not work due to sag / clearance and structure loading issues
– Multiple Manufactures for Specialized Conductor selection • Need to follow specs for Arbutus (existing conductor) but also need to
support 1600 amp ratings (AZ Summer environment) • Need to maintain or reduce loading on existing structures • Need to be installed at same or reduced tension compared to Arbutus
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Clearances vs. Tension
• Due to span lengths and existing structures... Graphical Sagging was used for
fitting conductor(s) to the existing terrain.
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Clearances vs. Tension with Graphical Sagging
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• All specialized conductors
were “fit” to the terrain allowing a 2 ft buffer for additional clearance.
• 4” vertical deviation
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Structure Remediation – per Conductor Type
– Tower member over-stress based on Conductor Selection
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Conclusion • Model Towers – don’t take short cuts
– Modeling the towers shows that the as-built conditions produce overloaded members, not expected...
– Also allows the user to identify unknown capacities that may be used if needed
• Conductor Manufacturers – Using multiple WIR files from various manufacturers was helpful to better
refine the potential installation solutions (alternate tensions, etc.)
• Specialized Conductors vs. Traditional Upgrade Methods – Evaluating a range of specialized conductor options could and some times
will be less expensive than doing a full rebuild
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12 Power Line Systems, Inc. 6/21/2019
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