ECML Power Supply Upgrade

Nicholas Lewis

Established Member
Joined
9 Aug 2019
Messages
1,344
Also worth remembering that Newcastle - Edinburgh was not part of the ECML electrification when it was first presented to the DfT for Authority. That was added on later, as an ‘even cheaper than chips’ extra.
Argh didn't know that it was already full scheme by the time i secured a position as a junior engineer on the project. At the end of the day there was limited grid points in Northumberland and Borders area so had to use what was on offer. CEGB were also quite worried at that time about the impact of Negative Phase Sequence currents arising from our unbalanced load and harmonic content especially in this area as there was limited generation to support the grid. This was why demand had to be constrained at some sites which was really only an issue under outage conditions. Unlike WCML the east coast EHV circuits ran a lot further inland so it wasn't practical to tap into that like WCML had done at Elvanfoot substation a decade earlier.
 
Sponsor Post - registered members do not see these adverts; click here to register, or click here to log in
R

RailUK Forums

Class 170101

Established Member
Joined
1 Mar 2014
Messages
6,647
Does taking all of the three phases (as opposed to just one or two) mean that distances between feeder stations can be increased due to higher power?
 

Nicholas Lewis

Established Member
Joined
9 Aug 2019
Messages
1,344
Does taking all of the three phases (as opposed to just one or two) mean that distances between feeder stations can be increased due to higher power?
No. The spacing of feeder stations is a factor of how frequently you want to run electric trains and the demand from each train and you also need to factor in perturbation situations. ie a half hourly service each way may only ever see 2 trains taking a load over a 40km long feeder section but if you get delays and the signalling system allows close headways you could find yourself with double the load. The ability to present a balanced three phase load to the electricity distribution system opens up where you can source a supply of electricity as you can connect at lower voltages down to 33Kv although I suspect this may result in more feeder stations rather than less as at this voltage level they may run up against supply constraints within the distribution network. Also a 2-3MW load may cause flicker issues with other consumers at this voltage level.
 

Top