Re: Pantograph Operation - Melbourne
  ma261065

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....@...

> <javascript:>> 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?

> >

>

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