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| New Tramway - Trams. - Other Areas. - Your Model Railway Club | ||||||||||
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MaxSouthOz Admin 
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I'm not too worried about the cable, Rick. You can see the wire I used in post 52. It's 0.70 mm galvanised tie wire and it doesn't look too bad. I was thinking more about the amount of work in the poles, guys and aerials to negotiate the bends and turnouts. I figure I'll go and look at our local tramway and copy their ideas, but it will be a bit of a job. Once the web of wires is up, then I have to sink the rare earth magnets into the roadbed to trigger the pan flash as the tram passes the occasional pole. ____________________ Max Port Elderley |
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Sol Former Member
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Max, as a young person when we had trams running around Adelaide, I don't remember flashing at each pole, only normally at the crossovers in the city and that was more with trolley pole than pantographs. | |||||||||
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MaxSouthOz Admin
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From what I can gather, Sol, the flash only happens if the tram is under load (e.g., accelerating). I understand that if it is coasting the flash doesn't happen. I'm not having magnets on every pole, just some to suggest the effect.
____________________ Max Port Elderley |
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Sol Former Member
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MaxSouthOz wrote: .............. If you pick up from the pantograpgh for one connection, then both track rails can be the return & you won't have to worry about live frog switching - known as LFS :exclam ( though for a bloke who plays with LEDs in his sleep, LFS will be a piece of cake). I think our Forum Index has articles on LFS but if not, then this site certainly describes it - http://www.brian-lambert.co.uk/Electrical-2.htm#Live%20frog%20%28Electrofrog%29%20points In your case, just substitute Tortoise for solenoids - all you need is a changeover switch. And if you still are/get confused, of course SSAS will be available ( Sol's Specialised Advice Service) |
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Gwiwer Former Member
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A trolley pole should not cause a flash on plain wire. The flash results from contact between the pole and the electricity supply being briefly interrupted such that the electricity tries to jump the gap in an arc. It is fairly normal to see small arcs as trams pass through intersections where there are crossing pans or frogs in the overhead. As well if a driver fails to shut off power while passing a section insulator then an arc will be drawn. In wet weather you might see small flashes from other areas of overhead due to a film of water accumulating on the trolley wire. But under normal operating conditions I would be wary of having a flash at each span wire. There is no reason for most of those flashes to occur. |
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Sol Former Member
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MaxSouthOz wrote: .............. I'm not having magnets on every pole, just some to suggest the effect. Ahhh, so Post #61 was a slight furphy trigger the pan flash as the tram passes each pole. We have got him at last  |
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MaxSouthOz Admin
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Settle down, Sol. The overhead is just going to be a dummy, like me.  Rick, our trams tended to flash at the suspension points along the wire, possibly because the pole wheel bounced downwards and broke contact for a second. Sol's right. Pantos rarely flash on the new trams, so it's all a bit academic, really. I'm just going to put a few magnets around the layout so there will be the occasional flash to keep the crowds of visitors entertained.  The layout is primarily for me to play with Rr&Co. ____________________ Max Port Elderley |
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MaxSouthOz Admin
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Sol wrote: MaxSouthOz wrote:.............. I'm not having magnets on every pole, just some to suggest the effect. . . . fixed. Bl***dy rivet counters :exclam ____________________ Max Port Elderley |
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MaxSouthOz Admin
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Sol wrote: MaxSouthOz wrote: . . . once again, you misunderstand me. When I said, "help", I meant, "come and do it for me." We both know people like that, don't we? ____________________ Max Port Elderley |
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Sol Former Member
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I will admit, the flash does look neat though, especially if irregular. because the pole wheel bounced downwards and broke contact for a second. - I had forgotten about that but I do remember now it happening a couple of times, tram came to a halt coz when it, the trolley pole, bounced back up, it missed the wire & the Connie had to get out & re-position it. |
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owen69 Former Member
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that happened with our trolley buses too Sol, they were like trams only had tyred wheels ,no track.   |
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Gwiwer Former Member
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Oddly enough I don't recall flashes from trolleybus overhead though there must have been some at times. I well remember trips on London, Portsmouth and Bournemouth trolleybuses and saw them in action in other places as well. Something like YouTube footage of moving ones shouldn't be hard to find for reference. |
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MaxSouthOz Admin
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As they phased out the suburban trams, they were replaced here with trolley buses, which had twin poles. I don't remember them flashing. Interestingly, the plan is now to replace all the buses on Adelaide suburban routes with, guess what - trams! I'm going to put all this flashing behind me now . . . ____________________ Max Port Elderley |
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MaxSouthOz Admin
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Sol wrote:
I got a job lot of Tortoise motors from a bloke whose hobby was building and tearing down layouts. There's no way I can afford solenoids compared to the price I got the Tortoises for.
____________________ Max Port Elderley |
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MaxSouthOz Admin
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Sol wrote:
I know I'm thick, Sol, but that's about as clear as mud. I can work it out, but I thought I'd save some time by copying someone who's done it. I'll look in the forum index. ____________________ Max Port Elderley |
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MaxSouthOz Admin
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Nope. Nothing in the index about Live Frog Wiring.
____________________ Max Port Elderley |
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MaxSouthOz Admin
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Is this what he means?  ____________________ Max Port Elderley |
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MaxSouthOz Admin
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. . . and are these the double slips?  It looks as though the frogs are switched by the opposite pair of points. Does anyone disagree with any of the propositions? ____________________ Max Port Elderley |
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Sol Former Member
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Max, I have responded to you via e-mail but the way you have drawn it is not ideal. http://yourmodelrailway.net/view_topic.php?id=1645&forum_id=6 |
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Sol Former Member
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Also have a look at this Max http://www.wiringfordcc.com/switches.htm |
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