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Identifying opportunities to improve the efficiency of power transmission through existing Overhead Power Lines Konstantinos Kopsidas Supergen - AMPerES
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Structure of the Presentation Supergen - AMPerES Basics of Ampacity & Sag Holistic Computational Methodology for Rating an OHL Analysis/Comparison of AAAC & ACSR Conductors on an 33kV OHL system Advanced conductors on the 33kV system Conclusions - The Way Forward
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Basics of Ampacity & Sag Supergen - AMPerES Ampacity = The amount of current a conductor can carry without exceeding a specified temperature I MAX is defined by the max conductor temperature or the max conductor elongation set by the operator
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Supergen - AMPerES Basics of Ampacity & Sag SPAN MCT Tension SPAN
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Supergen - AMPerES Computational Methodology
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Supergen - AMPerES Mechanical Computations EXAMPLE OF LOAD CASE WIND: 380N/m 2 ICE: 9.5mm & 913kg/m 3 BS EN 50423 BS EN 50341 BS EN 50182 Insulator Maximum Working Tension Absolute Conductor Working Tension Absolute Maximum Working Tension Vibration Limited Maximum Working Tension
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Supergen - AMPerES Electrical Computations BS method Neglects steel core in the table F.42 of standards R DC = R AL ASTM method considers steel core R DC = R ST || R AL BS EN 50182 ASTM B232
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Supergen - AMPerES Ageing Computations Predictor Equations IEEE 1283 (a) (b) Δ Δt Creep-Strain curve ΔTension
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Supergen - AMPerES 33kV Wood Pole Structure Analysis ENA TS 43-40 ENA TS 43-90 BS 3288 BS 1990-1 BS EN 62219 BS EN 50423 =5.2m =5.7m
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Supergen - AMPerES Different Conductor Technologies ACCR (3M) ACCC/TW (CTC) AAAC SOFT ACSR HARD ACSR
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Supergen - AMPerES AAAC Performance At Max Electrical + Mechanical Loading Increase of modulus (E) Reduction of thermal elongation(ε T ) Non-linear modulus Non-linear thermal elongation
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Supergen - AMPerES Analysis of AAAC
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Supergen - AMPerES AAAC Performance at different T MAX At different Max Operating Temperatures
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Supergen - AMPerES AAAC Performance
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Supergen - AMPerES Comparison of AAAC & ACSR
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Supergen - AMPerES Comparison of AAAC & ACSR
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Supergen - AMPerES Comparison of AAAC & ACSR Creep is included in the calculations
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Supergen - AMPerES Comparison of AAAC & ACSR
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Including 10 Year Creep Supergen - AMPerES Advanced Composite Conductors Creep is not considered 3M CTC
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Supergen - AMPerES Advanced Composite Conductors 3M CTC
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Supergen - AMPerES ConclusionsConclusions The methodology can be applied in any type & size of conductor including system design limitations & weather. AAAC are more suitable than the ACSR for the 33kV typical wood pole system. ACCC/TW develop less sag allowing uprating of the structure to 66kV.
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Supergen - AMPerES What is Next Performance Analysis of a real system Any real system?
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