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Could isolation transformers prevent electrocution on LU tracks?
On Sep 21, 11:08*pm, Charles Ellson
wrote: On Tue, 21 Sep 2010 10:15:19 -0700 (PDT), The Gardener wrote: AIUI, only the Euston - Watford DC line And NLL (where still DC) and WLL ? uses only one running rail for traction return and this is why the redundant fourth rail remains north of Harrow and Wealdstone; it is bonded to the return rail to reduce the return circuit resistance. IMU rather to prevent increasing it IYSWIM (see also "chicken and egg") as it was originally designed as 4-rail with substations spaced appropriately. Agreed! Apologies for not responding to this one sooner: to confirm, the WLL is electrified on Southern principles and uses both running rails for traction return. The sole surviving DC section of the NLL (Acton Central to Gunnersbury Junction) uses one rail. One of the odd consequences of the re-electrification of the NLL was that the DC section to Gunnersbury is now isolated. A new twin-transformer/ rectifier substation had to be built at Acton Central as the original sub only had one transformer/rectifier unit, and there would then have been no contingency if that had failed. The logical (ISTM) solution of putting in a new sub in the Gunnersbury area and supplying it from the Southern's 33 kV distribution system was not, for some reason, considered. As a result, an 11 kV feeder runs from Acton Lane solely to supply Acton Central. |
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