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Overhead Conductor Tension Sags, and Guying of Poles

The design of overhead distribution system on public right-of-ways requires the selection of wood or concrete poles that will withstand wind and ice loading. With the introduction of Ontario Regulation 22/04, any new, changes, or addition to an existing pole line must be designed/verified to have sufficient mechanical strength in accordance with to CSA Standard C22.3 No. 1 (Overhead Systems).

This two-day customized course will outline the physical and mechanical characteristics of the overhead line components and show how to apply these to design pole lines that meets the Regulation. Reference Standards and applicable specifications will be given. Examples will be presented.

Various Excel spreadsheets will be demonstrated to assist in determining pole class and guying/anchoring requirements to meet the required Grades of Construction. Please bring your calculator.

Who Should Attend

Technicians, technologists, and engineers working for electrical utilities, communication organizations and consulting engineering firms dealing with the design of new, joint use or upgrading of overhead distribution lines.

What’s Included

Each participant will receive a comprehensive set of seminar notes, which can be used as reference design manual. Snacks, refreshments and lunch will be freely available to all attendees.

Instructors

Wallas H. Khella, Ph.D., P.Eng.

Wallas has spent 13 years in industrial plants, followed by 25 years with Ontario electrical utilities. He has a thorough knowledge of overhead and underground distribution systems, distribution substations and protective devices. Over the last 30+ years, Wallas has taught various courses in Power System Engineering as part of the Continuing Educational Program of The University of Toronto for the IEEE and to several professional development organizations in Canada and abroad.

Seminar Agenda

Workshop starts at 8:30 AM and concludes at 3:00 PM. Lunch and snacks are provided. Attendees will receive an email about a week before the start of seminar that will provide more details on the course.

Topics covered in the seminar include:

  • Characteristics of Overhead System Components
    • Distribution Poles
    • Insulators
    • Overhead Conductors
  • Forces on Poles
    • Conductor Tension
    • Climatic Forces
  • Grades of Construction
  • Loading Factors
    • Loading Factors for Poles
    • Loading Factors for Guy Assemblies
  • Conductor Sags and Tensions
    • Factors Affecting Sag and Tension
    • Sag–Tension Equations
  • Clearances
    • Factors Affecting Clearance Values
    • Clearances Above Other Circuits
    • Clearances From Swimming Pools
    • Clearances Above Ground
    • Special Clearance Requirements
    • Clearances Over Navigable Waterways
    • Conductor Swing
  • Guying of Poles
    • Guy Wires
    • Guy Wire Insulator Rods
    • Anchors, Anchor Rods, Three-Bolt Clamps
    • Soil Classifications
    • Anchors Holding Strength
    • Guying Calculations
  • Software Demo
    • Sags and Tension
    • Anchor Lead Calculations
  • Standards and Specifications
    • Canadian Transport Commission
    • Canadian National Railway
    • Canadian Standards Association
  • Examples and Assignments
    • Clearance Calculations
    • Pole Class Selection
    • Guying Calculations
    • Railway Crossing