1 / 45

Logan Pleasant, P.E. ESC engineering, Inc.

Computerized Economic Analysis of Alternative Line Designs – A "How To" Approach for Quick Solutions. Logan Pleasant, P.E. ESC engineering, Inc. What is Economic Conductor Analysis?. Evaluation of the economic “break-even” point between two or more conductor types and or sizes.

kim
Download Presentation

Logan Pleasant, P.E. ESC engineering, Inc.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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

  2. What is Economic Conductor Analysis? • 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.

  3. Break Even Point - Definition • 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

  4. Governing Equations

  5. Governing Equations

  6. Definition of Variables • 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.

  7. Sensitivity Analysis • 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

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

  9. Computerization of Equations • 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

  10. Examples:

  11. Adding Tree Trimming Costs

  12. Changes to Wholesale Power Costs

  13. Changes in Expected Life of Line

  14. Changes in Interest Rates

  15. Do It Yourself

More Related