Deleted
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Post by Deleted on Mar 4, 2017 10:20:44 GMT
New S-Stock Power Feed Receptacle Boxes.
On the new S-Stock, I noticed an ingenious new safety feature on its Power Feed Receptacle Boxes, where the Depot supply leads gets plugged in when off current rails in the depot. There is a 3 position lever beside the box marked <TRACK> , <OFF> , AND <DEPOT>, or words to that effect. I am surprised that they did not think of this system earlier, so that the current collection shoes would be isolated whenever the train is being powered from overhead power leads inside the depot's roads.
Does anyone know whether the depot supply leads are 415V AC instead of the 600V DC, now that modern trains use 415V AC Motors only?
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Post by domh245 on Mar 4, 2017 12:37:50 GMT
The motors themselves aren't driven directly by the rails, they're controlled by an inverter, which will take in the DC voltage* and generating a pseudo-AC voltage. Not to mention that there are plenty of other systems on board the train that won't use an AC voltage which probably won't take well to it. A couple of questions that I've thought of though, is the 3 position handle the normal system by which the train is isolated from the power rails (which might suggest that the ability to then work from shed leads is an easy further step from that). Also, will the shed leads stay at their current voltage, or will they go to 750V? I expect that they'll stay at their current voltage as it is plenty to get the train out of the shed and avoids the need for new risk assessments? *At least that is what I think happens. Dstock7080 might be able to clarify this
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Post by Dstock7080 on Mar 4, 2017 13:04:43 GMT
Does anyone know whether the depot supply leads are 415V AC instead of the 600V DC, now that modern trains use 415V AC Motors only? Shed receptacles are Line voltage 630/750vDC. S Stock brings in Traction supply to the MCMs (Motor Converter Module) on each car and to the ACM (Auxiliary Control Module) on the M1 car. Traction voltage bus-lines are only between adjacent cars. 400vAC then goes from the MCMs to the traction motors and the brake resistor on each car. 400vAC also goes from the ACM on M1 car to the compressor on the DM car. 400vAC also passes along the train, with bridging contactors in the middle to maintain supply. ACMs also produce 120vAC along the train and also for battery pack charging.
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Post by Deleted on Mar 4, 2017 14:02:10 GMT
I am surprised that they did not think of this system earlier... They did! All passenger stock from 92TS onwards has this feature, as does the D Stock RAT and the AIT (Asset Inspection Train).
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rincew1nd
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Post by rincew1nd on Mar 5, 2017 22:02:07 GMT
Has anybody got a picture they could share?
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Post by Deleted on Mar 5, 2017 22:16:52 GMT
Has anybody got a picture they could share? In this photo to the right of the cab steps (shown there in 'track' mode). This is the same type fitted to S Stock.
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Post by Deleted on Mar 6, 2017 21:38:31 GMT
Having a good thought about it, and I just realised that it might have been implemented after the Electricity at Work Regulations 1989 came onto force, hence WR24's mention of the 1992 stock having such a system. Of course it was the first new trains after the Electricity at Work Regulations 1989 was enacted...Now I know.
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