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3
Background
• All-Inclusive Measurementline temperature, environment temperature, Solar Absorption
• Accuracy• Low-Power Draw
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•
D – Vertical sag
S – Horizontal length of the span
W – Unit weight of the conductor
Tr – Resultant conductor tension
Th – Horizontal component of tension
Fig. 1 Parabolic Sag Curve
Sag-Tension Calculations
Fig. 1
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Ice and Wind Loading
• Ice loading
• Wind loading
For structures below 60 feet:
For structures exceed 60 feet:
• Resultant ice and wind loading
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Actual Design Conditions
• The length of conductors DO NOT remain constant
a) High temperature
b) Stretching because of tension
• Vibration of conductors due to wind
a) Wind speed
b) Pole height
c) Span length
d) Tension
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Budget
Qty Description Cost Total
1 Transformer $0 $0
2 Cable $0 $0
2 Transformer Pad $20 $40
4 Various lugs, clamps, connectors
$20 $80
1 Circuit breaker $300 $300
3 Locking plug $42 $126
1 Tension meter $1000 $1000
Total: $1566
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Conclusion
• Background / proposed solution• Actual Design Problems
- Ice and wind loading- length of conductor- Aeolian vibration
• Budget• Timeline
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Questions?
Contact information:
Zhao Qi
ECE department, University of Utah
References:
[1]- “Overhead Conductor Manual”, 2nd Edition, Southwire Company, 2007
[2]- IEEE “Guide to the Installation of Overhead Transmission Line Conductor”, 2004
[3]- IEEE “Guide on Conductor Self-Damping Measurements”, 1978
[4]- “Sag and Tension”, Sep. 20, 2011. [online]. Available:
http://www.iaei.org/magazine/2004/05/the-effects-of-ruling-span-on-sag-and-tension/