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Optimal Performance Strategies for 35kV System Evaluation

Review decisions on 35kV usage, comparing with 13kV. Assess performance, costs, and Navigant findings to maximize system efficiency. Align with EDS strategy and integrate Parks' assertions for reduced substations and feeders. Evaluate substation and distribution costs for reliability enhancement. Recommend distribution planning adjustments, protection upgrades, recloser installations, and automation integration.

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Optimal Performance Strategies for 35kV System Evaluation

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  1. 35kV Assessment SWEDE 2007 May 10, 2007

  2. Mission/Objective • Review original decisions to utilize 35kV • Review Oren E. Park Report from 1971 • Understand the comparison of 13 & 35kV • Performance, reliability & costs • Review Navigant Findings from 2003 • Review CPS Planning Guidelines for 35kV • Formulate an approach going forward to maximize performance and reliability to 35kV system • Align with EDS strategy

  3. Team Members • Les Barrow – Planning & Reliability Engineering • Albert Lara – Reliability Planning • Dwain Duke – Reliability Planning • Rick Maldonado – Substation & Dist Planning • Sam Le - Substation & Distribution Planning • George Tamez – Overhead Engineering • Blake Williams – Underground Engineering • Joe Rodriguez – Substation Design

  4. Major Items • Past system costs & expansion • Reliability • Linear capacity optimization • Automation • Backbone philosophy • Progress and performance measurement

  5. Parks’ Assertions • Reduce number of substations • Reduce number & size of feeders • Reduced transmission right-of-way needs • Lower reliability with higher voltage • “Standards of safety and reliability enter into the comparison, and they will temper to some degree the attractiveness of the higher voltage resulting from the economic gain.”

  6. Substation Statistics

  7. Estimated Costs • Substation & Transmission savings • 25 substations at $2M = $50M • 10.6 mile/substation at $500k = $132.5M • Distribution added costs • Overhead: 2435 miles at $6,500/mi = $15.8M • Underground: 2435 mi at $12,000/mi = $29.2M • Net $50M + $132.5M - $45M = $137.5M

  8. Reliability Statistics

  9. Reliability Drivers • Number of Customers • Protection Philosophy • Construction Standards • Others – length, equipment, procurement, conductor size, construction to engineering feedback

  10. Number of Customers • 35kV feeder approximately three times number of customers as 13kV • 35kV feeder approx. twice 13kV length • No significant protection differences • 3 times customer * 2 times length = 6 times • Reliability Indices concur

  11. Protection Philosophy • Breaker, fuses & sectionalizers • Limited use of reclosers • Large fuses for URD loops • Limited breaker reclosing

  12. Construction Standards • BIL of structures • Grounding • Topology • Stress due to faults

  13. Conceptual Feeder

  14. Conceptual Performance

  15. Capacity, Automation, Backbone • Linear capacity optimization - relationships of all physical components need to be reviewed for optimum utilization • Automation - utilize intelligent reclosers, switches & schemes • Backbone philosophy – required foundation • Progress and performance measurement

  16. Recommendations • Distribution Planning to review customer number/circuit • Protection changes • Aggressive recloser installation project • Smaller fuses on smaller URD loops • Review all sectionalizers • Concurs with multi-shot approach • Construction design standards review • Investigation of linear capacity optimization by Distribution Planning • Implement backbone philosophy with automation • Progress and performance measurement by Reliability Planning

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