Eight-wire Square Line

Author: Edmund A. Laport

This configuration (Fig. 4.15) is suitable for transmission of high power with low attenuation and where low characteristic impedance is desired. A simplified construction is indicated in Fig. 4.16, where only one post insulator is needed to support the four high-potential wires at each pole on a straight run. This is a relatively low cost assembly.

Fig. 4.15

The high-potential wires can be free-running through retaining holes in the metallic star so that transverse stress is minimized in the post insulator. When h >> a,

FIG. 4.16. Construction of type XII feeder.

Two sample sets of values for a line of this type for low characteristic impedance are the following: