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Computerized Economic Analysis of Alternative Line Designs A How To Approach for Quick Solutions

Evaluation of the economic ?break-even" point between two or more conductor types and or sizes. Multiple Factors influence the time sensitive present worth cost of plant installation.Equations have been derivedInvolved, time consuming and cumbersome to use by hand for sensitivity studies.. What

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Computerized Economic Analysis of Alternative Line Designs A How To Approach for Quick Solutions

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    1. Computerized Economic Analysis of Alternative Line Designs � A "How To" Approach for Quick Solutions Logan Pleasant, P.E. ESC engineering, Inc.

    2. Evaluation of the economic �break-even� point between two or more conductor types and or sizes. Multiple Factors influence the time sensitive present worth cost of plant installation. Equations have been derived Involved, time consuming and cumbersome to use by hand for sensitivity studies. What is Economic Conductor Analysis?

    3. The point at which the sum of the present worth of all investment, owning and future loss costs are equal for two line construction alternatives: Present Worth of Capital Investment Present Worth of Carrying and Owning Charges Present Worth of Future Loss Costs Break Even Point - Definition

    4. Governing Equations

    5. Governing Equations

    6. CC = Carrying Charges IV2 = Investment cost of larger conductor line IV1 = Investment cost of smaller conductor line i = Interest rate in per unit CL = Initial annual cost of loss in dollars per kWh ie = Effective discount rate (includes load growth and power cost escalation) R1 = Resistance of larger conductor size R2 = Resistance of smaller conductor size LsF = Loss Factor kW = Peak kilowatt load kVLG = Line to ground voltage in kV P1 = # phases of larger conductor P2 = # phases of smaller conductor n = Expected life of line in years. Definition of Variables

    7. The relative sensitivity of the equations to any given input factor: Interest Rates Useful Life Future Load Growth Escalation in Wholesale Power Costs Tree Trimming Costs Changes in Line Construction Costs Labor Costs Power Factor Operation & Maintenance (O&M) Costs Sensitivity Analysis

    8. Determination of sensitivity allows the analyst to focus efforts on areas that have the greatest economic impact. Sensitivity Analysis

    9. Greater Flexibility Ease of Interface Saves Time Change independent variables quickly (�What if?� scenarios) Ability to view results graphically Reduce Chances for Errors Management Tool Computerization of Equations

    16. Examples:

    17. Adding Tree Trimming Costs

    24. Changes to Wholesale Power Costs

    31. Changes in Expected Life of Line

    38. Changes in Interest Rates

    45. Do It Yourself

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