Re: Pantograph Operation - Melbourne
  Ronald Besdansky

Remember when an electric train stopped at Kensington with the pantograph
on the dead section - the arc burnt through the overhead and brought it
down, somewhat (!) disrupting the p.m. peak service.

On Thu., 10 Jan. 2019, 16:06 'Richard Youl' via TramsDownUnder < tramsdownunder@... wrote:

> I don’t recall seeing anybody reply to this.

>

> It looks to me like a basically standard break insulator, requiring the

> driver to cut power as the insulated material is almost certainly longer

> than the width of the pantograph.

>

> Usually bridging insulators have V shape wings to pick up the pantograph

> while it is still on the approach side section of overhead. These are quite

> common on the railways but there could be other designs more recently

> developed which I have not seen. I’ll have to keep an eye open in Melbourne

> next month.

>

> Regards,

>

> On 9 Jan 2019, at 9:01 pm, ma261065 mickalex@...> wrote:

>

> Is this a breaking or no-break insulator (on Queen's Bridge)?

>

> On Wednesday, January 9, 2019 at 9:37:33 PM UTC+11, Matthew Geier wrote:

>>

>>

>> On 9/1/19 9:25 pm, 'Richard Youl' via TramsDownUnder wrote:

>> > As the length of the insulating material in the centre of the SI is

>> greater than the length of the pantograph head to avoid bridging the two

>> sections, it is necessary to cut power to avoid an arc which burns the

>> insulating material and adjacent metal.

>>

>> I understand there are both breaking and no-break SIs and that no-break

>> ones are becoming more common. With 10kw or more air-conditioning load

>> even cutting off will still draw an arc.

>>

>> And with the interruption to power, the air con compressor stops and has

>> to go through an unload - restart cycle that takes a minute or so.

>>

>>

>>

>> > Regards,

>> >

>> > On 9 Jan 2019, at 7:48 pm, Ronald Besdansky shrdlu....@...>

>> wrote:

>> >

>> > Are drivers still required to cut-off at section insulators and

>> H-crossings?

>> >

>> > I remember Green Men noting down the numbers of trams drawing an arc as

>> they crossed Swamston St in Collins St - not wanting to lose momentum for

>> the climb beside the Town Hall?

>> >

>>

> --

> You received this message because you are subscribed to the Google Groups

> "TramsDownUnder" group.

> To unsubscribe from this group and stop receiving emails from it, send an

> email totramsdownunder+unsubscribe@....

> To post to this group, send email totramsdownunder@....

> For more options, visit https://groups.google.com/d/optout.

> <20171123_050324.jpg>

>

> --

> You received this message because you are subscribed to a topic in the

> Google Groups "TramsDownUnder" group.

> To unsubscribe from this topic, visit

> https://groups.google.com/d/topic/tramsdownunder/QHtpnFg0CA0/unsubscribe.

> To unsubscribe from this group and all its topics, send an email to

>tramsdownunder+unsubscribe@....

> To post to this group, send email totramsdownunder@....

> For more options, visit https://groups.google.com/d/optout.

>