Overhead Distribution Systems

5.0 1 Review SKU: TDODS00CENDuration: 60 Minutes

The purpose of this course is to teach the basic layout of overhead distribution systems, to explain how to identify circuits and equipment in the field, and to introduce delta- and wye-connected distribution systems. The basic theory underlying the operation of delta and wye systems is presented, and the differences between them are discussed. At the conclusion of this course, participants should be able to describe the basic layout of an overhead distribution system and identify circuits and equipment in the field. They should understand the basic characteristics of delta and wye systems and should be able to identify delta and wye circuits in the field. They should also understand the importance of identifying whether a system is connected delta or wye before any work is performed.

Course Details


Training Time: 60 minutes

Compatibility: Desktop Only

Based on: Industry Standards and Best Practices

Languages: English

Learning Objectives

  • Distribution Systems Layout
  • Identify the major components of a typical overhead distribution system.
  • Distinguish between primary and secondary distribution systems.
  • Identify common overhead distribution system layouts.
  • Identify the major line sections of an overhead distribution system.
  • Poles, Pole Hardware, and Conductors
  • Recognize and identify distribution poles and pole hardware.
  • Recognize and identify overhead distribution conductors.
  • Poletop Equipment
  • Recognize and identify the following types of distribution poletop equipment: transformers, voltage regulators, capacitors, reclosers, sectionalizers, fused cutouts, surge arrestors, static wires, and gang-operated air switches.
  • Delta and Wye Systems
  • Describe the winding connections for a substation transformer in a delta primary system.
  • Describe the winding connections for a distribution transformer in a wye primary system.
  • Explain how to distinguish between a delta systems and wye systems.
  • 34.5 KV Primary System
  • Recognize and identify a 34.5 KV primary distribution system.
  • Explain the function of a dual voltage transformer.
  • Troubleshooting
  • Describe some common steps for locating and isolating trouble on an overhead distribution system.

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