On 15/08/2022 09:53,peterm...@... wrote:
> 1500A on a 600V overhead, is not good in terms of voltage drop.  Ive

> not been to Melbourne for a while, is it still a single contact wire,

> or are there dual contact wires and additional feeder wires like

> railway approach to reduce voltage drop?

>

There are multiple feeder cables throughout the system and no places
that I am aware of where there is noticable voltage drop.

I was told at a safety briefing by Yarra that the trip current from a
substation is usually set at 2500A - meaning that up to 5000A is
available in a typical section fed from both ends.

There are no double contact wires that I am aware of, but there are
places where an extra set of contact wires is hung on the overhead as
feeders.  You can see them in my pic at: https://tdu.to/i/52233

The light rail lines to St Kilda and Port Melbourne still have the
heavier contact wire and catenary from railway days.

See my pic at: https://tdu.to/i/39803

Mal Rowe - who once knew a bit about Elec Eng