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Christian Brothers University 650 East Parkway S, Memphis TN 38104

Christian Brothers University 650 East Parkway S, Memphis TN 38104. MAESC CONFERENCE - 2005. Provisioning the Power System for the Porter Farms P.D. By: Marnelli Pascual. Overview. What is Porter Farms P.D.? Preliminary Designs Loop System Specifications Calculations Cost Analysis

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Christian Brothers University 650 East Parkway S, Memphis TN 38104

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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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