National Academies Press: OpenBook

Stray Current Control of Direct Current-Powered Rail Transit Systems: A Guidebook (2020)

Chapter: Appendix B - Responses from Transit Agencies

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Page 75
Suggested Citation:"Appendix B - Responses from Transit Agencies." National Academies of Sciences, Engineering, and Medicine. 2020. Stray Current Control of Direct Current-Powered Rail Transit Systems: A Guidebook. Washington, DC: The National Academies Press. doi: 10.17226/25768.
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Page 75
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Suggested Citation:"Appendix B - Responses from Transit Agencies." National Academies of Sciences, Engineering, and Medicine. 2020. Stray Current Control of Direct Current-Powered Rail Transit Systems: A Guidebook. Washington, DC: The National Academies Press. doi: 10.17226/25768.
×
Page 76
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Suggested Citation:"Appendix B - Responses from Transit Agencies." National Academies of Sciences, Engineering, and Medicine. 2020. Stray Current Control of Direct Current-Powered Rail Transit Systems: A Guidebook. Washington, DC: The National Academies Press. doi: 10.17226/25768.
×
Page 77
Page 78
Suggested Citation:"Appendix B - Responses from Transit Agencies." National Academies of Sciences, Engineering, and Medicine. 2020. Stray Current Control of Direct Current-Powered Rail Transit Systems: A Guidebook. Washington, DC: The National Academies Press. doi: 10.17226/25768.
×
Page 78
Page 79
Suggested Citation:"Appendix B - Responses from Transit Agencies." National Academies of Sciences, Engineering, and Medicine. 2020. Stray Current Control of Direct Current-Powered Rail Transit Systems: A Guidebook. Washington, DC: The National Academies Press. doi: 10.17226/25768.
×
Page 79

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75 Responses from Transit Agencies A P P E N D I X B

Serial # Question Transit Agency Name Transit Agency 1 Transit Agency 2 Transit Agency 3 Transit Agency 4 Transit Agency 5 1 Transit Agency Name, Contact Person Name, and Title 2 Mode used for power distribution, operational voltage, and the type of power for the system? Overhead Catenary – 750V dc Third Rail – 600V dc LRT = Overhead Catenary & HRT = Third Rail – 750V dc Third Rail – 1000V dc Overhead Catenary – 750V dc 3 Type and Length of each system (in miles), by type? 7.5 miles of LRT 660 miles of LRT 88 miles of LRT & 22.5 miles of HRT 110 miles of LRT (double track) 48 miles of LRT 4 What is the physical environment of your service area? Urban - Downtown & Business District Underground, Elevated & exclusive ROW Semi Urban, Urban shared & Urban exclusive ROW Urban exclusive ROW (Semi Urban) Urban, Semi Urban & railroad corridors 5 Is there an embedded section of track for the system? seYseYseYseYseY 6 What is the average spacing of substations on your system? > 1 but < 2 miles > 1 but < 1.25 miles > 1 but < 1.5 miles (depends on the configuration necessary) > 1 but < 2 miles (with few longer sections) > 1 but < 2 miles 7 Are the pedestrian stations located in the same area as traction power stations? seYseYoNseY 8 Was the baseline survey conducted for the system? seYoNseYoNecivreseuneverehtretfA 9 Do you routinely perform stray current control testing/monitoring for operating sections of your rail systems? Yes No, unless a stray current problem is suspected or reported No, unless a stray current problem is suspected or reported seYseY 10 What is the preferred track-to-earth resistance for your system? 250 ohms/1000 track feet 300 ohms/1000 track feet - Embedded track 500 ohms/1000 track feet - Ballasted track 500 ohms/1000 track feet 250 ohms/1000 track feet 11 Does the transit agency currently have stray current corrosion issues? wonkt’noDseYwonkt’noDoNoN 12 How would you rate your stray current corrosion mitigation effort/program? Very Good Good Good 13 What value would a rail transit stray current best practice guide document have to you? eulaVemoSeulavhgiHeulavemoSeulavemoS 14 Are you willing to participate in a more detailed questionnaire to provide further information about the stray current corrosion issues and mitigation methods? seYseYseYseYseY Response from Transit Agencies

Serial # Question Transit Agency Name 1 Transit Agency Name, Contact Person Name, and Title 2 Mode used for power distribution, operational voltage, and the type of power for the system? 3 Type and Length of each system (in miles), by type? 4 What is the physical environment of your service area? 5 Is there an embedded section of track for the system? 6 What is the average spacing of substations on your system? 7 Are the pedestrian stations located in the same area as traction power stations? 8 Was the baseline survey conducted for the system? 9 Do you routinely perform stray current control testing/monitoring for operating sections of your rail systems? 10 What is the preferred track-to-earth resistance for your system? 11 Does the transit agency currently have stray current corrosion issues? 12 How would you rate your stray current corrosion mitigation effort/program? 13 What value would a rail transit stray current best practice guide document have to you? 14 Are you willing to participate in a more detailed questionnaire to provide further information about the stray current corrosion issues and mitigation methods? Transit Agency 6 Transit Agency 7 Transit Agency 8 Transit Agency 9 Transit Agency 10 Overhead Catenary – 750V dc Third Rail & Overhead Catenary – 600V dc Overhead Catenary – 750V dc Third Rail & Overhead Catenary – 650V dc Overhead Catenary – 750V dc 58.5 miles of LRT 22 miles of LRT, 50 miles of HRT 42 miles of LRT 30 miles of LRT, 20 miles of HRT 60 miles of LRT Semi Urban, Urban shared, & Urban exclusive ROW Urban exclusive ROW Semi Urban, Urban shared, & Urban exclusive ROW Urban shared & exclusive ROW Semi Urban, Urban shared, & Urban exclusive ROW seYseYseYseYseY > 1 but < 2 miles < 1 mile > 1 but < 2 miles < 1 mile < 1 mile Yes No Yes Yes Some are seYoNseYseYseY Yes Yes Yes Periodic rail continuity testing of LRT Yes 500 ohms/1000 track feet 1000 ohms/1000 track feet 500 ohms/1000 track feet Not Specified 200 ohms/1000 track feet - Embedded track 500 ohms/1000 track feet - DF and Ballasted track seYseYwonk t’noDoNseY Poor Non-existent Poor Good Very Good High value Some value High value Some value High value seYseYoNseYseY Response from Transit Agencies

Serial # Question Transit Agency Name 1 Transit Agency Name, Contact Person Name, and Title 2 Mode used for power distribution, operational voltage, and the type of power for the system? 3 Type and Length of each system (in miles), by type? 4 What is the physical environment of your service area? 5 Is there an embedded section of track for the system? 6 What is the average spacing of substations on your system? 7 Are the pedestrian stations located in the same area as traction power stations? 8 Was the baseline survey conducted for the system? 9 Do you routinely perform stray current control testing/monitoring for operating sections of your rail systems? 10 What is the preferred track-to-earth resistance for your system? 11 Does the transit agency currently have stray current corrosion issues? 12 How would you rate your stray current corrosion mitigation effort/program? 13 What value would a rail transit stray current best practice guide document have to you? 14 Are you willing to participate in a more detailed questionnaire to provide further information about the stray current corrosion issues and mitigation methods? Transit Agency 11 Transit Agency 12 Transit Agency 13 Transit Agency 14 Overhead Catenary – 750V dc Third Rail – 750V dc Third Rail & Overhead Catenary – 750V dc Third Rail & Overhead Catenary – 600V dc 26 miles of LRT 103 miles of HRT 15 miles of HRT, 26 miles of LRT 189 miles of LRT, 42 miles of HRT Urban shared ROW Semi Urban & Urban exclusive ROW Semi Urban, Urban Shared ROW, and Urban Exclusive ROW Urban shared & exclusive ROW seYseYseYseY > 1 but < 2 miles > 1 but < 2 miles > 1 but < 2 miles > 1 but < 2 miles era emoSera emoSera emoSera emoS senil emos nOseYseY seYseYseY 100 ohms/1000 track feet - Embedded track 250 ohms/1000 track feet - Ballasted track 500 ohms/1000 track feet - Direct Fixation track 50 ohms/1000 track feet - Tie & Ballasted track 1000 ohms/1000 track feet 500 ohms/1000 track feet seYseYseYoN dooG yreVdooGdooGssalC dlroW High value Some value Some value High value seYseYseY Response from Transit Agencies

Serial # Question Transit Agency Name 1 Transit Agency Name, Contact Person Name, and Title 2 Mode used for power distribution, operational voltage, and the type of power for the system? 3 Type and Length of each system (in miles), by type? 4 What is the physical environment of your service area? 5 Is there an embedded section of track for the system? 6 What is the average spacing of substations on your system? 7 Are the pedestrian stations located in the same area as traction power stations? 8 Was the baseline survey conducted for the system? 9 Do you routinely perform stray current control testing/monitoring for operating sections of your rail systems? 10 What is the preferred track-to-earth resistance for your system? 11 Does the transit agency currently have stray current corrosion issues? 12 How would you rate your stray current corrosion mitigation effort/program? 13 What value would a rail transit stray current best practice guide document have to you? 14 Are you willing to participate in a more detailed questionnaire to provide further information about the stray current corrosion issues and mitigation methods? Transit Agency 15 Transit Agency 16 Transit Agency 17 Transit Agency 18 Transit Agency 19 Overhead Catenary – 650V dc Overhead Catenary – 750V dc Third Rail – 750V dc Third Rail – 750V dc LRT = Overhead Catenary – 650V dc, HRT = 1500V dc 15 miles of LRT 43 miles of LRT 20 miles of LRT (double track) 25.5 miles of HRT 497 miles of HRT, 311 miles of LRT Urban exclusive and shared ROW Urban exclusive and shared ROW Urban exclusive ROW Semi Urban Semi Urban, Urban shared, and Urban exclusive ROW seYoNseYseY seY > 1 but < 2 miles > 1 but < 2 miles (with one longer then 2 mile section) > 1 but < 2 miles < 1 mile > 1 but < 3 miles era emoSera emoSseYseYseY oNsenil emos nOseYsenil wen eht nO seYseYseYseYoN 500 ohms/1000 track feet Between 5 to 20 ohm km (single rail) As per European Standard EN 50122-2, conductance per unit length for a single track is 0.5 S/km seYseYoNoNseY dooG yreVdooGdooGdooG yreVtnetsixe-noN High value Some value Some value High value Some value seYseYoNseYseY Response from Transit Agencies

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Stray current and stray current–induced corrosion remain concerns among transit agencies, electrolysis committees, utility owners, providers, and electric railway carriers across the globe. It is easier to implement stray current isolation, mitigation, and collection options on a newer transit system with proper foresight and planning by following the logical sequence of the design process than to maintain a stringent maintenance and testing regime on an older system.

The TRB Transit Cooperative Research Program's TCRP Research Report 212: Stray Current Control of Direct Current-Powered Rail Transit Systems: A Guidebook allows transit agencies, design, and maintenance practitioners to influence new system construction, extensions, and maintenance and operation of existing systems.

Improving the Safety and Sustainability of Stray Current Control of DC-Powered Rail Transit Systems (PowerPoint slide deck) highlights the research review and guidebook development.

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