# Braced Line Post Ratings IEEE T&D R. Allen Bernstorf Hubbell Power Systems - PowerPoint PPT Presentation

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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

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

### Why Use a Braced Line Post?

• Line Compaction

• Fixed Conductor Position

• All achieved with a line post

• Mechanical Capabilities

• Increased Over Standard Line Post

• Based Upon Strength of Components

• Pivoting Design – Tensile Rating of Post

• BLP – Cantilever Rating of Post

• Transverse – Based Upon Post

### Braced Line Posts

α ≡ Upsweep angle of post

(w/r to horizontal)

β ≡ Suspension angle

(w/r to horizontal)

V ≡ Vertical load to be sustained.

### 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))

Suspension String Subassy.

Rating of Suspension

Rating of Series Hardware

Rating of Post Attachment Hole

ST≤ Any of These.

### Considerations

• Line End Post Fitting

• Tension

• Vertical

• Longitudinal

• Combined Magnitude of Loads ≤ Cap Rating

### Considerations

• Pc = St*cos(β)/ cos(α)

• Euler’s Buckling Equations

• Porcelain – Increase I

• Polymer – Work within Elastic Buckling Limit

• What is “k”?

### Fitted Curves

• Braced Line Post

• Pivoting Horizontal Vee