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EE 392 Stewardship

EE 392 Stewardship. Transmission Towers, Power Lines & Birds David Dukes Michael Harper. Basic Facts. Not only costly to birds but costly to power companies Actual statistics on bird death are hard to calculate

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EE 392 Stewardship

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  1. EE 392 Stewardship Transmission Towers, Power Lines & Birds David Dukes Michael Harper

  2. Basic Facts • Not only costly to birds but costly to power companies • Actual statistics on bird death are hard to calculate • US Forest Service estimates power lines to kill hundreds of thousands to 175 million birds per year • 10.7% of line outages are due to birds • 60% of bird deaths are from collisions with the overhead shield wire (OHSW) or optical ground wire (OPGW) • Power lines are estimated to electrocute tens of thousands to hundreds of thousands annually • Most of these electrocutions occur on distribution lines as opposed to transmission lines as the phases are spaced closer together • Birds like to use transmission structures as perches. It is common for osprey to build their nests on these structures.

  3. Prevention Methods • Perch Preventers • Flight Diverters • Nesting Platforms • Spiral Vibration Dampers (SVDs) • GreenJacket Cover Up • Removal of bird trap structures

  4. Zena Bird Perch Preventers • Prevent birds from perching and nesting on power structures • Reduces bird deaths • Reduces power outages • Environmentally friendly • Zenadesign.com

  5. FireFly Bird Flight Diverter • Reflective tag hung on OHSW or OPGW to increase visibility • Can also be installed on side guys and bridle guys • Glows in low light conditions for up to 12 hours • Rotates on the line in the wind • Installed live • Pr-tech.com

  6. Preformed Bird Flight Diverters • Increases visibility to reduce the number of bird collisions with power lines • Installed on OHSW or OPGW for high voltage applications • Can be installed directly on live conductors in low voltage applications • Also acts as a damper to reduced vibrations in the line • Preformed.com

  7. Nesting Platforms • Separate structures built away from power lines give birds a safer place to perch and nest • Similar designs to the one below have been made in which bird or even owl houses can be hung from the structure • Often constructed from salvaged power line material to cut costs

  8. Bird Trap Structures • Power structures like the one to the right are dangerous for birds • This design is mostly seen on distribution lines or lower voltage transmission lines (69kV) • Birds can perch on the lower cross arm and when they fly away are at a greater risk of colliding with 2 of the higher phases • Removal of structures like these will lead to less bird electrocutions • Alternative designs have been created

  9. CantegaGreenJacket Cover Up – “It fits” • 20% of substation outages are caused by wildlife prior to installation • After installation outages and wild life fatality were greatly reduced • Offers a solution to cover up energized areas in substations • Standard cover up available or they will come to your substation and provide a custom solution based on your needs • Live Installation • Cantega.com

  10. References • AltaLink (http://www.altalink.ca) • US Forestry Department (http://www.fs.fed.us) • Cantega Industries (http://www.cantega.com) • Preformed Line Products (http://www.preformed.com) • PR Tech (http://www.pr-tech.com) • Zena Design (http://www.zenadesign.com) • Analysis of Factors Contributing To Unexplained Transmission Line Faults on a High Voltage Transmission Network (Bekker, Hoch)

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