S&C’s Power Systems Services in association with
IEEE Toronto Section present:

Overhead Conductor Tension and 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 one and a half day seminar is designed for Engineers, Technologists and Technicians working for electrical utilities, communication organizations and consulting engineering firms dealing with the design of new or upgrading of overhead distribution lines.

The seminar will outline the physical and mechanical characteristics of the overhead line components and shows how to apply these to design pole lines that meets the Regulation. Reference Standards and applicable specifications will be given.

Each participant will receive a comprehensive set of seminar notes, which can be used as reference design manual. Various Excel spreadsheets will be demonstrated to assist in determining the guying/anchoring requirements to meet the required Grades of Construction. Please bring your calculator.

What’s Included

A bound set of notes will be provided. Snacks, refreshments and lunch will be freely available to all attendees. Contact S&C for hotel rate code after registration.

Cancellation

Cancellations must be made two weeks prior to the seminar date to allow for an 90% refund. Alternate attendee(s) are acceptable but please advise name(s) in advance of seminar.

Instructor

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

For 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. In recognition of his contributions to professional education, the IEEE Toronto Section has named a scholarship in his honour. Wallas is a fellow of the Engineering Institute of Canada and a Senior Life Member of IEEE.

Course Outline

1. Characteristics of Overhead System Components
1. Distribution Poles
2. Insulators
3. Overhead Conductors
2. Forces on Poles
1. Conductor Tension
2. Climatic Forces
3. Grades of Construction
4. Loading Factors
1. Loading Factors for Poles
2. Loading Factors for Guy Assemblies
5. Conductor Sags and Tensions
1. Factors Affecting Sag and Tension
2. Sag–Tension Equations
6. Clearances
1. Factors Affecting Clearance Values
2. Clearances Above Other Circuits
3. Clearances From Swimming Pools
4. Clearances Above Ground
5. Special Clearance Requirements
6. Clearances Over Navigable Waterways
7. Conductor Swing
7. Guying of Poles
1. Guy Wires
2. Guy Wire Insulator Rods
3. Anchors, Anchor Rods, Three-Bolt Clamps
4. Soil Classifications
5. Anchors Holding Strength
6. Guying Calculations
8. Software
1. Sags and Tension
2. Anchor Lead Calculations
9. Standards and Specifications
1. Canadian Transport Commission
2. Canadian National Railway
3. Canadian Standards Association
10. Examples for Railway Crossings

For More Information

Contact: Ms. Kenisha Willis
Tel: (416) 249-9171, ext. 349
Email: kwillis@scelectric.ca
Fax: (416) 249-6051