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OCS Design in Regions of EMI: University Link and Northgate Link Anya Grechka, PE

OCS Design in Regions of EMI: University Link and Northgate Link Anya Grechka, PE January 27, 2014. Overview. Link Light Rail Extensions Overview EMI Region EMI Introduction Testing Changes in Magnetic Field OCS Design for EMI Methodology Drawings Further Considerations.

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OCS Design in Regions of EMI: University Link and Northgate Link Anya Grechka, PE

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  1. OCS Design in Regions of EMI: University Link and Northgate Link Anya Grechka, PE January 27, 2014

  2. Overview • Link Light Rail Extensions • Overview • EMI Region • EMI Introduction • Testing • Changes in Magnetic Field • OCS Design for EMI • Methodology • Drawings • Further Considerations

  3. Link Light Rail ExtensionsOverview

  4. Link Light Rail ExtensionsEMI Region “Source: https://maps.google.com/

  5. EMI Introduction Source: http://gaussbusters.com/resources/articles/principles-of-magnetism/ Earth’s magnetic field Electromagnetic field B-field generation Effects on lab equipment

  6. EMI IntroductionTesting

  7. EMI IntroductionChanges in Magnetic Field Source: “Magnetic Field of Electrified Railway Line I Slovenia” by BojanCene • Current flowing for propulsion • Distance between dipole sources • Distance from source • Movement of ferrous materials through Earth’s magnetic field causing perturbation • Shielding • Active cancellation

  8. OCS Design for EMIMethodology • SCFT system in tunnels • Standard Sound Transit conductor sizes • MW only for mechanical support, no current • Feeder cable connected in parallel with CW • Riser cables at regular intervals • Optimized ratios to minimize B-field:

  9. OCS Design for EMIAssembly Drawings

  10. OCS Design for EMIAssembly Drawings

  11. OCS Design for EMIGeneral Arrangement

  12. Further Considerations Wear of the CW Material of MW Resistance of clamps and risers Installation tolerances Crossover design

  13. Thank You! Contact: agrechka@ltk.com

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