Handbook of Power System Engineering
Chapter One
Overhead Transmission Lines and
Their Circuit Constants
In order to understand fully the nature of power systems, we need to study the nature of transmission
lines as the first step. In this chapter we examine the characteristics and basic equations of three-phase
overhead transmission lines. However, the actual quantities of the constants are described in
Chapter 2.
1.1 Overhead Transmission Lines with LR Constants
1.1.1 Three-phase single circuit line without overhead
grounding wire
1.1.1.1 Voltage and current equations, and equivalent circuits
A three-phase single circuit line between a point m and a point n with only L and R and without an
overhead grounding wire (OGW) can be written as shown in Figure 1.1a. In the figure, [r.sub.g] and
[L.sub.g] are the equivalent resistance and inductance o ... read full excerpt from Handbook of Power System Engineering ebook
