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Post by tubeprune on Oct 2, 2006 15:22:59 GMT
In a recent incident at St Johns Wood, a technician had to be set to a train stalled due to no air being available to close the HSCBs after current had been discharged for a while. He was sent with a foot pump. He had to use it to pump air into the system to close the HSCB before power could be accessed by the train to work the compressors etc.
Questions:
What should have been done, or is this a built-in design fault on all 9xTS?
Where would the air connection for the foot pump go?
Should TOs be issued with bicycle pumps? ;D
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Post by Deleted on Oct 2, 2006 15:25:19 GMT
My turn for a question! Whats a HSCB? |
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Post by johnb on Oct 2, 2006 15:33:41 GMT
My turn for a question! Whats a HSCB? An HSCB is a High Speed Circuit Breaker, used to protect the train's electrics from overload if things go wrong with the power supply. When it's closed, the train switches on. An HSBC is a kind of bank. When it's closed, the shareholders make more money.  John B |
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Post by Deleted on Oct 2, 2006 15:37:46 GMT
An HSCB is a High Speed Circuit Breaker, used to protect the train's electrics from overload if things go wrong with the power supply. When it's closed, the train switches on. Similar to a conventional MCB? An HSBC is a kind of bank. When it's closed, the shareholders make more money. HA HA! Like it..... |
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Post by Tubeboy on Oct 2, 2006 16:14:59 GMT
Cheers for that people! Never heard of this equipment before.
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Post by Deleted on Oct 2, 2006 16:43:12 GMT
Cheers for that people! Never heard of this equipment before. I have to say, neither did I! |
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Post by Deleted on Oct 2, 2006 16:48:02 GMT
should it be a punishment for a SPAD, that the drivers put air back into the brakes by foot pump?!
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Post by Deleted on Oct 2, 2006 18:27:42 GMT
Perhaps it should replace the slow speed circuit - instead of forcing the driver to go slowly after tripping past a signal, you can force him to spend time pumping up the main line air loss before proceeding |
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DWS
every second count's
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Post by DWS on Oct 2, 2006 19:36:22 GMT
Perhaps it should replace the slow speed circuit - instead of forcing the driver to go slowly after tripping past a signal, you can force him to spend time pumping up the main line air loss before proceeding Not likely, the Trade Unions would not have it ;D |
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Post by c5 on Oct 2, 2006 19:39:13 GMT
Perhaps it should replace the slow speed circuit - instead of forcing the driver to go slowly after tripping past a signal, you can force him to spend time pumping up the main line air loss before proceeding Not likely, the Trade Unions would not have it ;D The old Signal Release's used to be winding handels- now that's an incentive not to pull a wrong'un off!  |
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Post by Harsig on Oct 3, 2006 11:13:25 GMT
In a recent incident at St Johns Wood, a technician had to be set to a train stalled due to no air being available to close the HSCBs after current had been discharged for a while. He was sent with a foot pump. He had to use it to pump air into the system to close the HSCB before power could be accessed by the train to work the compressors etc. Questions: What should have been done, or is this a built-in design fault on all 9xTS? Where would the air connection for the foot pump go? Should TOs be issued with bicycle pumps? ;D I believe that it is possible to carry out certain isolations on the train to prevent this situation arising when the train is off juice for an extended period. However, not knowing exactly what is involved I don't know how practicable it is on a train in service or even whether the train operators have the necessary knowledge to do this. The only occasions I am aware of it being done it was carried out by a rolling stock technician in Stanmore sidings when traction current was to be discharged in the sidings overnight, something that does not normally happen. Of course the foot pump isn't the only solution. The alternative is to bring up the following train and couple up. The assisting train can then provide all the air required, and the two trains can then be uncoupled and depart separately. I recall one early turn I had a few years ago where this sort of thing took place all morning. It had snowed heavily the previous evening and there were half a dozen or more stalled trains on the Jubilee Line between West Hampstead and Stanmore that had been there all night. |
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