What is the difference between ACSR and HTLS conductor?

What is an ACSR Conductor?
       conductor steel-reinforced cable (ACSR) is a type of high-capacity, high-strength stranded conductor typically used in overhead power lines.

      The outer strands are high-purity aluminium, chosen for its good conductivity, low weight and low cost.

      The center strand is galvanised steel for additional strength to help support the weight of the conductor and provide additional mechanical strength.

      Steel has higher strength than aluminium which allows for increased mechanical tension to be applied to the conductor.

What is HTLS Conductor?
      High-Temperature Low Sag Conductors (HTLS) can withstand operating temperatures of up to 210 °C, thus carrying higher power compared to conventional conductors.

Comparison between ACSR & HTLS Conductor?

Material CompositionAluminum conductor with steel coreComposite conductor with various materials, including aluminum, steel, and composite materials
Temperature RatingStandard temperature ratingHigher temperature rating, designed to handle elevated temperatures without significant sagging
Sag PerformanceMore susceptible to sagging under high temperatures and heavy loadsDesigned for low sag, maintaining structural integrity even at high temperatures and heavy loads
AmpacityLimited by temperature constraints and sag considerationsHigher ampacity due to enhanced thermal performance and lower sag
Corona PerformanceModerate corona performanceImproved corona performance, reducing energy losses and electrical discharge
Usage ConsiderationsCommon in regular transmission linesUsed in specific applications where high ampacity, low sag, and reduced corona loss are critical, often employed in reconductoring projects
CostGenerally more economicalUsually more expensive due to advanced design and materials, but the higher performance justifies the cost in certain scenarios
ApplicationsWidely used in various transmission scenariosSpecifically chosen for applications where the benefits of higher ampacity and reduced sag are essential, such as reconductoring projects and areas with right-of-way challenges
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