p 101 ep 3-f
TRANSCRIPT
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3F-01-P101-EP
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Lesson Objectives• Identify the basic components of the
utility power distribution system.
• Identify how powerlines can cause wildfires.
• List mitigation measures to prevent powerline related fire causes.
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Introduction
• Powerlines can pose a threat to ignition of wildfire in various fuel conditions.
• Fires of this cause are generally large and damaging.
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• Generally start during dry windy periods.
• High winds blow trees across power lines.
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• Some states have passed laws requiring fire safe precautions for powerlines.
• Fire protection agencies can work closely with utilities to minimize customer and public safety.
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Basic Electric Utility System
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Power Pole Levels
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Powerline Equipment Related Fire Causes
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Fire Causes• Resistance
• Fault• Arcing
• Overload
• Flashover3F-09-P101-EP
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Types of Fires
• Hardware function or malfunction
• Vegetation in contact with conductor
• Downed trees
• Animals
• Flashover3F-10-P101-EP
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Powerline Hardware With Ignition Potential
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http://osfm.fire.ca.gov/powerline.html
Power Line Fire Prevention Guide
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Fuses
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3F-15-P101-EP
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Solid Blade Disconnect
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Lightning
Arrester
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3F-19-P101-EP
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Hot Tap Clamps
Good design
Bad design
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Split Bolt Connectors
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Indicators Associated With Powerline Fires
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Line Conductors
•Overload
•Line tension
•Line sag or sway
•Change in elevation
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Conductor Failure
• Splice failure
• Heat arcing
• Contact with trees
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“ “Burner” Burner” Tree on lineTree on line
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Insulators
•Dirty Insulators• Salt spray, dust
•Humidity up•Dew
• Early morning or night
•Foggy conditions
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Birds and Small Animals
• Large birds• Snakes
• Flocks of birds
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Transformers
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Service Interruption
• Frequency
• Type of interruption
• Phase to phase
• Phase to ground
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Fire Fire PreventionPrevention Mitigation Mitigation MeasuresMeasures
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Clearance Requirements3F-33-P101-EP
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Annual meeting with utilities
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Discussion Items with Utility Discussion Items with Utility CompanyCompany
• Focus on high hazard, high risk areas
• Maintenance schedule
• Attention to high stress poles
• Conductor (powerline) inspection
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Summary and Review Lesson Objectives
• Identify the basic components of the utility power distribution system.
• Identify how powerlines can cause wildfires.
• List mitigation measures to prevent powerline related fire causes.
3F-36-P101-EP