Hi Mick,
I have seen slower response time here in Ausgrid Area when I have reported
11kV down Live, it seems at the time your resoursing was good, Is it the
same today up there?
Railways are paranoid - too many managers empoyed from outside the
railways, and with no running line RISI etc experiance.
Yeaes ago with Overhead down at a teenager more aware than others, I have
jumped clear of an over head down train - U boat as they are known with
1500 triping and recolosing, I waited till it tripped and jumped clear and
ran before it reclosed.
But apparently I know to much as a Now electrical engineer.......
Peter
On Monday, 13 March 2023 at 11:35:43 UTC+11 Mick Topp wrote:
> To put this in perspective, some years ago I was a high voltage switching
> operator for an energy utility and my assistant and I got a call saying
> that an 11kV main had come down during a storm onto a car and caravan in an
> industrial area and was still energised as the HV feeder had automatically
> reclosed after the initial fault.
> We were there within 15 minutes and while we ensured that the occupants
> remained in the vehicle which was spectacularly discharging across the wet
> tyres, we ascertained that the fallen main was between the first air break
> switch on the feeder and the substation, so even as we were racing around
> to the sub to open the oil circuit breaker we were calling in on the radio
> to get the switching confirmed in case we had missed something in the
> crappy conditions. By the time it was confirmed we already had the OCB
> opened and disconnected and were back at the air break ready to open it as
> well.
>
> After testing that the main was de-energised we cut it clear of the
> vehicle and made sure that the couple and their kids in the car were OK.
>
> Within 5 minutes the overhead line crew arrived and started repairing the
> wire and we reversed the switching once they had finished.
>
> This all took less than an hour from receiving the call.
>
> A properly set up organisation should be prepared for these incidents and
> have expert crews instantly mobilised.
>
> They squawk about safety but the train incident is ridiculous. A well
> trained driver or guard should know that healthy people could jump clear
> and hop away with no ill effects as long as they didn’t walk normally, or
> they could use a fibreglass ladder or plank to get them out safely. Any
> elderly or infirm passengers could be carried out by a strong, healthy
> person or emergency services person and if they couldn’t, at least they
> wouldn’t be suffocating because the doors would be open.
>
> I don’t think sitting in a sealed train for hours in summer is good safety
> management by the operator.
>
>
>
> Cheers,
>
> Mick in Brisbane who has trained people in this stuff
>
>
>
> *From:*tramsdo...@... tramsdo...@...> *On
> Behalf Of *Matthew Geier
> *Sent:* Sunday, March 12, 2023 9:33 AM
> *To:*tramsdo...@...
> *Subject:* Re: [TramsDownUnder] Sydney Light Rail Outage: Overhead Wiring
> Issues Cause Commuter Chaos In Sydney
>
>
>
> I've been sent a photo of the failed bit of overhead - not at liberty to
> repost so don't ask.
>
> Looks like a piece of parafil or it's attachment gave way resulting in a
> dropper arm hanging below the contact wire in the Chinatown area.
>
> Had the failure not been noticed it could have easily ripped a pantograph
> off making the incident much more complex.
>
> After they started turning back cars at Central Chalmers, apparently one
> of the points at Central decided to die adding to their challenges.
>
> Points failures are happening so often there is a 'points reliability
> enhancement' project underway. Seems the mechanisms are too easily clogged
> up with dirt and sand.
>
>
>
> The Panania incident ripped off a pantograph AND a hatch cover. Not clear
> what order it happened, but they managed to pull down the catenary as well
> as the contact wire.
>
> As passengers couldn't be trusted not to 'self evacuate' into a space that
> had potentially live wires in reach, the passengers had to wait over an
> hour in a train with no ventilation, non openable windows and closed doors,
> till overhead crews could 'safe isolate' the accident site.
>
> It took them most of Saturday to repair the damage.
>
>
>
> On 12/3/23 10:09, Greg Sutherland wrote:
>
>
>
>
> https://vervetimes.com/sydney-light-rail-outage-overhead-wiring-issues-cause-commuter-chaos-in-sydney/
>
> L2/L3 CBD and South East Lines between Central and Circular Quay closed
> for 5 hours 30!
>
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