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Provisioning the Power System for Porter Farms P.D.

Detailed overview of the power system design for Porter Farms P.D. project in Collierville, TN, including specifications, calculations, cost analysis, and project stages. Three design options discussed with advantages and encountered problems. Final design details, load calculations, and project summary provided.

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Provisioning the Power System for Porter Farms P.D.

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  1. Christian Brothers University650 East Parkway S, Memphis TN 38104 MAESC CONFERENCE - 2005 Provisioning the Power System for the Porter Farms P.D. By: Marnelli Pascual

  2. Overview • What is Porter Farms P.D.? • Preliminary Designs • Loop System • Specifications • Calculations • Cost Analysis • Project Summary

  3. Porter Farms P.D. • Consists of 2 Areas • Area 1, Subdivision with 69 lots • Area 2, Apartments with 52 units, plus 1 clubhouse • Located in Collierville, TN

  4. Project Location

  5. Project Stages • Stage 1 • Develop Area 2, Apartments • Stage 2 • Develop Area 1, Subdivision

  6. Existing Power Sources 3Ø 1Ø 3Ø

  7. Design 1 – Two UG Loops

  8. Design 1 – Two UG Loops BORE UNDER RAILROAD

  9. Design 1 (cont’d) BORE UNDER THE STREET

  10. Design 1 (cont’d) • Advantages • Feeds are from the closest sources • No tree trimming/removal required • Problems Encountered • Railroad approval takes at least 90 days • Minimum railroad crossing fee of $75,000

  11. Design 2 – Two UG Loops

  12. Design 2 – Two UG Loops NEW 1Ø OVERHEAD LINE LAKE

  13. Design 2 (cont’d) • Problems Encountered • Crossing fee and approval from Railroad company required • City of Collierville and the homeowner’s association objected to the design • Involves tree trimming/removal

  14. Design 3One UG Loop

  15. Design 3One UG Loop UNDERGROUND PRIMARY TEMPORARY OVERHEAD LINE

  16. Design 3 (cont’d) BORE UNDER THE STREET

  17. Design 3 (cont’d) • Advantages • No railroad fee or approval required • No tree trimming/removal • Problem Encountered • Cost of $10,000 for the temporary electric

  18. UG Single Loop • Calculated Loads • Apartments = 525kVA • Subdivision = 775kVA • Total = 1300kVA • MLGW Requirement • Maximum load = 1320kVA

  19. UG Electrical Loop

  20. Transformer Isolation DISCONNECT

  21. Specifications • Fuse: (2) 100 A • Transformers Used (Area 1 & 2) • (3) 50 kVA • (14) 75 kVA • (1) 100 kVA • Cables & Conduits • Primary: #2 insulated copper inside 2” pvc conduit • Secondary: 350 kCM triplex inside 3” pvc conduit • Meter Sockets (Apartments) • (12) 6-Gang Meter • (2) 2-Gang Meter • (1) Single Meter

  22. Specifications (cont’d) • 6-Gang Meter Socket RISER ENTRY

  23. Specifications (cont’d) • Location of Facilities • Riser Location

  24. Specifications (cont’d) • Location of Facilities • Transformer Location (Apartments)

  25. Specifications (cont’d) • Location of Facilities • Transformer Location (Subdivision)

  26. Calculations • Cost: Software-calculated • Fuse: No calculation needed • Cables & Conduits • Size: Software-calculated based on cable length and load • Length: Measured from map

  27. Calculations (cont’d) • Cable Tension, ≤ 850 lbs. • Maximum Tension = 831 lbs. • Software-calculated

  28. Calculations (cont’d) • Transformer Size (Apartments) Equation 1

  29. Calculations (cont’d) • Transformer Size (Apartments) Calculated Total Load per Unit = 15.32 kVA Equation 2

  30. Calculations (cont’d) • Transformer Size (Subdivision)

  31. Project Cost

  32. Apartments Cost

  33. Apartments Cost (cont’d)

  34. Project Summary • All requirements were met • MLGW and the customer approved the final design • Project is currently under construction

  35. Questions

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