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Improving Overhead Transmission Line Usage (提高架空输电线的使用)
1
Improving Overhead Transmission
Line Usage Efficiency on a
Caribbean Island Power System
S. Bahadoorsingh, L. Bhairosingh, S. Sharma, M. Ganness
The University of the West Indies | Dept of Electrical and Computer Engineering
IEEE PES TD 2014
Chicago, Illinois
16th April 2014
2
Transmission Line Rating Factors
3
Dynamic Line Rating – The Concept
• Know true line capacity in real time
• Improve system reliability
•Optimize grid utilization
(Oncor Electric Delivery Company, 2010)
4
Standards
1. IEEE Standard for Calculating the Current-
Temperature of Bare Overhead Conductors
(IEEE 738-2006)
2. Cigré “Thermal Behaviour of Overhead
Conductors”
Heat Balance Equation (IEEE 738)
Heat losses Heat gains
2
q q q I R(T )
r c s c
Radiated heat loss Solar heat gain
Convected heat loss Joule heating
Ampacity
qr qc qs
I
R(T )
c
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