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Optimum Line Configuration

Optimum Line Configuration. By Albert J. F. Keri James A. Halladay Jeffrey E. Momme. Phasing Configuration Low Reactance vs. Super Bundle. Transposition Phase Conductors & Shield Wires. Ideal Double Circuit Configuration Low Reactance + Transposition.

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Optimum Line Configuration

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  1. Optimum Line Configuration By Albert J. F. Keri James A. Halladay Jeffrey E. Momme

  2. Phasing Configuration Low Reactance vs. Super Bundle

  3. Transposition Phase Conductors & Shield Wires

  4. Ideal Double Circuit Configuration Low Reactance + Transposition

  5. Selected 345 kV Double Circuit For Studies

  6. Line Configuration vs. Loss & Unbalance

  7. Change In Loss & Unbalance Factor

  8. Implementation: Phase Conductors Transposition

  9. Implementation: Phase Conductors Transposition

  10. Implementation: OPGW Transposition

  11. Implementation Cost Cost for phase conductor transposition One cycle transposition ( three transposition locations along the line). Increased Cost: $750k - 900k per circuit Two cycle transposition (six transposition locations along the line). Increased Cost: $900k - 1,800k per circuit Cost increase from conventional shield wires, (if instead, they are constructed with) OPGW. Increased Cost: $15K/ mile (per sw includes splicing and labor) OPGW and insulated/transposed. Increased Cost: $33K/ mile (includes 1 sw plus structure mod, labor & material)

  12. Loss & Savings 40 years Present Value, Interest rate = 8.5%, Carrying Charge = 13.12% : $1550 / kW (variable)

  13. Low Reactance compared to Superbundle Advantages: Lower phase and shield wire losses Lower voltage and current unbalance Lower Zero Sequence voltage and current Lower Electric and Magnetic Field Higher surge impedance loading Disadvantages: Slight increase in foul weather corona loss, audible noise (40 vs 37dbA) and radio interference( ‹1 dB ) SummaryDouble Circuit 345 kV Line Transposed Low Reactance compared to Low Reactance Advantages: Lower phase and shield wire losses Lower voltage and current unbalance Lower Zero Sequence voltage and current Disadvantages: Increased implementation cost Line tap, within transposition cycle may reduce the benefits Shield Wire Transposition Advantages: Reduces shield wire losses Disadvantages: Increased implementation cost Best Electrical configuration: Transposed Low Reactance and Insulated Shield wires

  14. Recommendation • Low Reactance Phasing should be implemented. • Low Reactance Phasing, plus Phase Transposition, may be prudent depending on system parameters (loading, length, future plans, etc) • Without cost & tapping consideration, Low Reactance Phasing, Phase Transposition & Insulated Shield Wires, is the best electrical configuration.

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