Home |
Search |
Today's Posts |
|
London Transport (uk.transport.london) Discussion of all forms of transport in London. |
|
LinkBack | Thread Tools | Display Modes |
#8
|
|||
|
|||
Signal failure at Victoria
In message , at 11:39:51 on Fri, 6 Jul 2018,
Anna Noyd-Dryver remarked: Roland Perry wrote: In message , at 11:50:20 on Thu, 5 Jul 2018, Anna Noyd-Dryver remarked: Roland Perry wrote: In message , at 09:58:26 on Thu, 5 Jul 2018, Graeme Wall remarked: Just when you thought it couldn't get any worse… https://www.bbc.co.uk/news/uk-england-london-44721415 I smell a rat. It's extremely unlikely that Network Rail has experienced the simultaneous failure of three separate incoming grid feeds, nor would it take all day to get just one of them re-instated. This sounds like the *Network Rail* equipment which merges the three feeds into the supply to the signalling centre has gone up in smoke. Any other electricity supply issues reported overnight in Stretham? Presumably you’re referring to the tweet referenced in that article “Passengers are advised not to travel from the South into London this morning due to total loss of signalling power that Network Rail has experienced on 3 separate supplies in Streatham area.”? I see no suggestion that it’s external rather than railway-internal power supplies which have failed. It's one signalling centre which is without power, thus the "three supplies" must be those for that centre. Here's another report from Network Rail (via Simon Calder): "A generator has been sourced to isolate the power feed and is expected to arrive at the signalling centre later this morning. Once the generator arrives, the situation will be re-assessed." Note, not three generators, one for each of hypothetically three separate sites. Right, here’s some Actual Facts copied from another forum. quote As I understand it, it was loss of all signalling power to Streatham Junction Remote Interlocking area. Ex-Southern Region area signalling installations usually have three seperate incoming power supply sources, but in this case there was a catastrophic failure of a part of common equipment. Other sources state that NR has had to bypass the equipment in hard wiring to get it working again, but before it could do that it first had to determine what had caused the original failure, and also monitor the temporary setup to make sure a hidden fault didn't reoccur and cause even more damage. Apparently the incident is subject to a formal inquiry which will report back to the NR Board and the DfT. Edit to add: This just in from GTR journeycheck: “The electrical supply that maintains this areas signalling system failed. The failure has been traced to a faulty power supply cable which feeds off the national grid.” Well, that must of given the changeover switchgear a good bang /quote And from another post in the same place: “Signal power feed triple redundant 3 input BUT the changeover swiitch (single point of failure) was what burnt out” That confirms everything I was saying about the cause, thanks. It appears to differ from Network Rail's originally announced quick-fix of generators, unless that's what they used ahead of working out it was safe to hard-wire one of the two remaining grid feeds. Thus they still have quite a big project ahead of them - reinstating the three-way failover equipment (as well as the grid having to make 3/3 rather than 2/3 of the supplies operational). -- Roland Perry |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Signal Failure | London Transport | |||
Piccadilly line signal failure | London Transport | |||
Signal failure on the central line? | London Transport | |||
How can you have a signal failure on an ATO system? | London Transport | |||
Why can't LU cope with a signal failure? | London Transport |