Contact. Heat. Clearance.

Existing overhead lines face two connected challenges: electrical contact hazards and temperature-driven sag. Both can bring energized conductors into closer contact with vegetation.

Bare overhead distribution conductors on wooden crossarms

When bare lines meet their surroundings.

Vegetation, adjacent conductors, fallen lines, and conductive objects can create electrical contact hazards. Faults and arcing can become ignition sources when combustible material is nearby.

Distribution contact illustration: vegetation reaching a bare overhead conductorBare conductorVegetationContact hazard
Distribution contact illustration.

Hotter conductors can sag closer to vegetation.

As transmission lines heat up, conductors can expand and sag closer to vegetation. Improving heat rejection can help preserve clearance at a given electrical load, or provide additional capacity within an established temperature limit.

Transmission thermal sag illustration: a warmer conductor sags closer to vegetation, reducing clearanceLower temperatureHigher temperatureReducedclearance
Transmission thermal-sag illustration.

What we're testing.

Vegetation contact

Bare conductor

Kratos

Vegetation contacting an energized conductor can create an electrical fault and ignition risk.

Conductor slap

Bare conductor

Kratos

Wind can bring conductors together, creating a risk of electrical faults and arcing.

Downed lines

Bare conductor

Kratos

A downed conductor may remain energized. Contact with the ground or vegetation can create ignition and electrocution hazards.

Object contact

Bare conductor

Kratos

Conductive objects, including metallic balloons, can bridge conductors and cause faults or arcing.