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Braced Line Post Ratings IEEE T&D R. Allen Bernstorf Hubbell Power Systems

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

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

  2. 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

  3. 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.

  4. 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))

  5. Suspension String Subassy. Rating of Suspension Rating of Series Hardware Rating of Post Attachment Hole ST≤ Any of These. Considerations

  6. Considerations • Line End Post Fitting • Tension • Vertical • Longitudinal • Combined Magnitude of Loads ≤ Cap Rating

  7. 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”?

  8. Buckling Loads

  9. Measured Values

  10. 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)

  11. Vertical Capabilities

  12. Questions?

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