IEEE Power & Energy Magazine - March/April 2020 - 33

* Power
* Voltage
* Structure Type
* Hardware
Configuration

Initial Concept

Optimized
Project
Conductor
Selection

* Electric Losses
* Maximum
Temperature
* EM Fields
* Material Costs

Final Tower
Geometry

Initial Tower
Geometry

Technical and
Economic
Analysis

Structural Weight

* Bundle
Optimization
* Insulation
Coordination

Minimum
Conductor Height
and Right of Way

figure 1. The workflow for the optimization of a transmission-line project.

march/april 2020	

(a)

ku = 1

(b)

4
SIL (Ground Wire)

insulator strings. The examined
weather conditions include a group
of stochastic parameters that must
be considered in a statistical analysis of design requirements, that is,
meeting criteria for allowable
✔✔ fundamental frequency overvoltages that permit no failures at maximum operating
voltage and consider the effects of wind and pollution
✔✔ overvoltages due to switching transients from energization or reclosing that
must meet prescribed risks
of failure
✔ ✔ over voltages caused by
lightning discharges related
to direct or indirect strikes
(back flashover) that consider a maximum number
of expected outages rela-
ted to the local lightningstrike density.

3
2
1

(c)
(e)

(c)

(d)

(b)
(a)

(d)
(e)

0
5

10

15

5m

ns

figure 2. The relation between SIL and number of subconductors, n s, for different
design approaches. (a) A conservative design using standard hardware and evenly
distributed spacing. (b) An EXB, still restricted to a regular shape. (c) A fully optimized
design with irregular bundles, resulting in a maximum SIL. (d) Another example of a
conservative design using standard hardware and evenly distributed spacing. (e) An
additional EXB design, still restricted to a regular shape.
ieee power & energy magazine 	

33



IEEE Power & Energy Magazine - March/April 2020

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - March/April 2020

Contents
IEEE Power & Energy Magazine - March/April 2020 - Contents
IEEE Power & Energy Magazine - March/April 2020 - Cover2
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IEEE Power & Energy Magazine - March/April 2020 - Cover3
IEEE Power & Energy Magazine - March/April 2020 - Cover4
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