COURSE DESCRIPTION

This program covers the basic layout of overhead distribution systems. It explains how to identify circuits and equipment in the field and introduces delta- and wye-connected distribution systems. The basic theory underlying the operation of delta- and wye-connected distribution systems is also presented, and the differences between the two systems are discussed. The program also explains how to differentiate between 34.5 KV systems and 13.2 KV systems.

COURSE GOALS

• Describe the basic layout of an overhead distribution system.
• Identify circuits and equipment in the field.
• Outline the basic characteristics of delta and wye systems, and describe their distinguishing characteristics.
• Recognize and identify a 34.5 KV primary distribution system.

SUBJECTS AND 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 pole hardware.
• Recognize and identify overhead distribution conductors.

Pole Top Equipment

• Recognize and identify the following types of pole top equipment: transformers, voltage regulators, capacitors, reclosers, sectionalizers, fused cutouts, surge arresters, static wires, and gang-operated air switches.

Delta and Wye Primary Systems

• Describe the winding connections for a substation transformer in a delta primary system.
• Describe the winding connections for a substation transformer in a wye primary system.
• Explain how to distinguish between 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.