Braced line post ratings ieee t d r allen bernstorf hubbell power systems
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Braced Line Post Ratings IEEE T&D R. Allen Bernstorf Hubbell Power Systems. Why Use a Braced Line Post?. Line Compaction Fixed Conductor Position Controlled Transverse Loading Swing All achieved with a line post Mechanical Capabilities Vertical Loading Increased Over Standard Line Post

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Braced line post ratings ieee t d r allen bernstorf hubbell power systems

Braced Line Post RatingsIEEE T&D R. Allen BernstorfHubbell Power Systems


Why use a braced line post
Why Use a Braced Line Post?

  • Line Compaction

    • Fixed Conductor Position

    • Controlled Transverse Loading Swing

    • All achieved with a line post

  • Mechanical Capabilities

    • Vertical Loading

      • Increased Over Standard Line Post

      • Based Upon Strength of Components

    • Longitudinal Loading – Based Upon Design

      • Pivoting Design – Tensile Rating of Post

      • BLP – Cantilever Rating of Post

    • Transverse – Based Upon Post


Braced line posts
Braced Line Posts

Pc ≡ Post compressive loading

St ≡ Suspension tension loading

α ≡ Upsweep angle of post

(w/r to horizontal)

β ≡ Suspension angle

(w/r to horizontal)

V ≡ Vertical load to be sustained.


Calculations
Calculations

V=St*sin(β)+Pc*sin(α)

St*cos(β)=Pc*cos(α)

St=(V*cos(α))/((cos(α)*tan(β)+sin(α)) *cos(β))


Considerations

Suspension String Subassy.

Rating of Suspension

Rating of Series Hardware

Rating of Post Attachment Hole

ST≤ Any of These.

Considerations


Considerations1
Considerations

  • Line End Post Fitting

    • Tension

    • Vertical

    • Longitudinal

  • Combined Magnitude of Loads ≤ Cap Rating


Considerations2
Considerations

  • Line Post Compression Loading

  • Pc = St*cos(β)/ cos(α)

  • Buckling Becomes an Issue – Compression loading on Column

    • Euler’s Buckling Equations

    • Buckling load= π2*E*I k*l2

  • Porcelain – Increase I

  • Polymer – Work within Elastic Buckling Limit

    • What is “k”?




Fitted curves
Fitted Curves

  • Braced Line Post

    • Buckling load= (π2*E*I)/(1.33*L2)

  • Pivoting Horizontal Vee

    • Buckling load= (π2*E*I)/(1.03*L2)

  • Fixed Base Horizontal Vee

    • Buckling load= (π2*E*I)/(1.02*L2)




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