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Enhancing Safety in Overhead Distribution: Arc Flash Solutions by PSO

This presentation, delivered by Dennis Keilbarth on May 8th, 2009, at PSO in Tulsa, covers the importance of arc flash safety in overhead distribution systems. It provides an overview of Public Service Company of Oklahoma's (PSO) Arc Hazard Program, focusing on engineering solutions, policy improvements, and ongoing initiatives aimed at reducing hazards and enhancing compliance with safety codes. With insights into technical parameters, incident energy calculations, personal protective equipment requirements, and ongoing training efforts, this session emphasizes consistent safety practices across all distribution operations.

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Enhancing Safety in Overhead Distribution: Arc Flash Solutions by PSO

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Presentation Transcript

  1. Overhead Distribution Arc Flash at PSO SWEDE Tulsa May 8th, 2009 Dennis Keilbarth

  2. Overview • Introduction/Background • Technical overview • Engineering and policy solutions • Ongoing work • Conclusion

  3. Public Service Company of Oklahoma • 527,000 Customers • 4405 MW Generation • 3700 mi Transmission • 21,857 mi Distribution • 1712 Employees • Headquarters in Tulsa • 96 Years Old

  4. American Electric Power • 5 Million Customers • 11 States • 38,000 MW Generation • 39,000 mi Transmission • 208,000 mi Distribution • 20,000 Employees • Headquarters in Columbus Ohio • 102 Years Old

  5. PSO’s Arc Hazard Program • Dedicated teams • Generation • Transmission and Substations • Network Distribution • Metering • Overhead Distribution and Underground Residential (URD)

  6. Overhead and URD Strategy • Purpose • Improve safety/reduce hazards • NESC National Electric Safety Code compliance • Considerations • Consistency across distribution operating districts • Consistency across GT&D business units • Trade-offs: don’t introduce new safety hazards

  7. Arc Flash Overview • Significant Parameters • Fault Current • Clearing Time • Distance • Voltage • Measured in cal/cm2 • “Incident Energy” • 1.2 cal/cm2 = 2nd degree burn on bare skin Image provided by Southern Company

  8. Technical Overview Calories/cm2 Calculations Clearing times 2 to 60 cycles Fault Current 1000 to 20,000 amps

  9. Arc Energy as Clothing Curves

  10. Fuse Curve vs Clothing Curves

  11. Recloser Curves vs Clothing Curves

  12. System Summary * NRO = Non-Reclose Order

  13. Solutions • Increase Distance • 6ft+ hotstick • Reduce Clearing Time • Place devices in non-reclose • Some electronic relays have fast trip settings • (Hot Line Tag) • Looking to deploy in high hazard zones

  14. Solutions • Cover-up • Reduce chances of poly-phase faults • Watch for damaged equipment while applying • PPE • Personal Protective Equipment • Last line of defense

  15. PPE Solutions Traditional PSO Requirements: • 4 cal/cm2 FR shirt, Hardhat, Safety Glasses New Additional Requirements: • 8 cal/cm2 (total) layered FR shirt system • Breaker zones require NRO unless a specific analysis has been performed on a breaker without an NRO, with a <= 8 cal result.

  16. Ongoing Work • Develop internal web resources for arc flash information • Training videos • Testing • Clothing system combinations • Effects of reclosing, HLT, and other devices

  17. Conclusion • Simple, consistent solutions that fit across a wide range of facilities and work practices • Achieve the largest safety gains possible while considering the big picture trade-offs • Be prepared to refine processes as new information becomes available • Always look to “engineer-out” the hazards

  18. Questions?

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