IEEE Power & Energy Magazine - March/April 2020 - 35

For the design of a new transmission line, the optimization
of EM parameters can achieve a better field distribution and
a higher SIL, resulting in an increased transmission capacity.
230-kV double-circuit line with low series reactance was
installed on existing 500-kV structures. The four-subconductor bundles per phase were expanded, forming a double circuit with two subconductors per bundle (Figure 3).
This solution increased the power-carrying capability to
Fortaleza by 25%. The efficacy of the EXB solution was
proven through the reduced need for static compensation
and better current distribution in the corridor's transmission facilities. Finally, in 2000, the Presidente Dutra-Fortaleza line, 740 km long, was converted to 500 kV by using
EXB (Figure 4).
Today, several companies in Brazil employ EXB designs,
proving their acceptance. For instance, the 500-kV line Barreiras II-Rio das Éguas-Luziânia, with an EXB utilizing six
subconductors, was commissioned by Consórcio Paranaíba in
2018. Future applications of this technology looks promising.

(a)

With the increased use of HSIL technology, CHESF, Eletrobras, and CEPEL developed metrics for assessing these
projects. Measurements of EM levels are used to calibrate
the models and demonstrate the efficacy of the design to the
general public.
In 2003, Furnas installed its first HSIL/EXB 500-kV line
with four aluminum conductor steel reinforced (ACSR) rail
conductors (954 kcmil) per phase between the Cachoeira
Paulista and Adrianópolis substation; it is 350 km long and
uses a series of structures called cat face towers. This alternative increased the standard SIL from 900 to 1,200 MW by
employing a very light and flexible self-supporting structure
compared with other structural patterns of the same capacity.
In 2009, Furnas installed a 500-kV pilot line with a compact configuration, fully optimized with six ACSR rail conductors in a cross-rope tower. The asymmetric arrangement

(b)

figure 4. A 500-kV EXB HSIL line in northeastern Brazil. (a) and (b) Different angles from the same line. (Source: CHESF;
used with permission.)
march/april 2020	

ieee power & energy magazine 	

35



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
IEEE Power & Energy Magazine - March/April 2020 - 1
IEEE Power & Energy Magazine - March/April 2020 - 2
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IEEE Power & Energy Magazine - March/April 2020 - Cover3
IEEE Power & Energy Magazine - March/April 2020 - Cover4
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