Has anyone built 50kV SWER networks?

[Jonturner]

We run around 600 SWER networks in Queensland, Australia with the highest delivery voltage at 19.1kV. Some of these are +400km of line length with 200kVA isolating transformers. We are working with Universities to design SWER for the future and need to know if anyone is working with a higher voltage SWER for distribution.

 

[7anoter4]

Do you mean Single wire earth return system?I saw once upon a time 20 kV SWER but I don't see its advantage.

 

[7anoter4]

Sorry! What I saw is Two Wires and Earth [as a third conductor] for a three phase distribution overhead lines.
Somewhere in Georgia [Russia] Two Conductors and Earth System is much extended and in Russia, I heard, was even 110 KV line experiment.

 

[mgtrp]

Transpower in NZ has provisions for operating the DC link between the North and South Islands as a SWER system. NZ in general has a large amount of rural distribution via SWER lines, although I'm not aware of any at higher voltages than ~20 kV.

The Canadian utility that I work for now uses a number of single-phase VT's connected to its conventional 138 and 69 kV systems to supply single phase power (up to 100 kVA) to remote areas that are near a transmission line, essentially piggy-backing a SWER system onto a 3-phase system.