ee 392 stewardship
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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 - PowerPoint PPT PresentationTRANSCRIPT
EE 392 Stewardship
Transmission Towers, Power Lines & Birds
David DukesMichael Harper
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.
Prevention Methods
Perch Preventers Flight Diverters Nesting Platforms Spiral Vibration Dampers (SVDs) GreenJacket Cover Up Removal of bird trap structures
Zena Bird Perch Preventers
Prevent birds from perching and nesting on power structures
Reduces bird deaths Reduces power
outages Environmentally
friendly Zenadesign.com
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
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
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
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
Cantega GreenJacket 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
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 Tra
nsmission Line Faults on a High Voltage Transmission Network (Bekker, Hoch)