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TLP Electrification and Signalling Interface Issues 1
Date 28-01-2014
Thameslink ProgrammeElectrification & Signalling Interface Issues
Martin Sigrist – Principal Design Engineer (E&P)
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 2
Content
• Introduction
• What is Thameslink
• Outline of Electrification on Thameslink
• Dual Electrification
• Autotransformer System
• Earthing and Bonding
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 3
What is Thameslink
• Thameslink Programme high level requirements for the route (s)
–12 car trains
–24 trains an hour (in each direction) within the Core Area
• Including up to 32 TPH in perturbation recovery
• E&P Requirements
–Electrification system capable of feeding the above
– Initial scope developed in 90’s under Thameslink 2000, but developed further under the current scheme
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 4
What is Thameslink
Bedford
Luton
St Albans
Farringdon
Blackfriars
Elephant & Castle
London Bridge
Wimbledon SuttonE Croydon
Brighton
Streatham
St Pancras Thameslink
WimbledonSevenoaks
Cambridge
Peterborough
Bedford
Luton
St Albans
Welwyn Garden City
St Pancras ThameslinkFarringdon
Blackfriars
Elephant & Castle
London BridgeBexleyheath
SidcupDartford
Sutton
Tattenham Corner
E Croydon
Horsham
Brighton
Caterham
East Grinstead
Ashford
Final Service pattern post–KO2
Initial service pattern
Sevenoaks
KO2 service still being finalised
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 5
Electrification on TLP
• The original system design identified a number of upgrades to both the AC and DC Systems, this mainly comprised of:
– 25kV Traction Enhancement on the MML due low volts at City Thameslink under outage (N-1)
– 750V DC System upgrades at know weak areas and for equipment overloading under outage (N-1)
– Extension of the Dual Electrified Area between Farringdon and City Thameslink, driven by operational requirements
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 6
Dual Electrified Area
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 7
Dual Electrified Area• Old Layout between Farringdon and Blackfriars with an 8 Car
Contactor Section
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 8
Dual Electrified Area• New layout between Farringdon and Blackfriars with an
extended DEA and 12 Car Contactor Section
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 9
Dual Electrified Area
• Issues arising:
–Design choice of track circuits – single or double
–Stray currents both AC and DC – effects to track circuits
–DC Stray currents – corrosion
–Track circuit reliability – new issue following commissioning was IRJ Arcing
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 10
Dual Electrified Area• Further investigations in to old issues like revisiting
stray current on Thameslink as part of the AC/DC interface
• Testing, monitoring and analyzing to better understand the drivers of stray current in order to predict the changes as the service level changes in future timetables
• An interim monitoring system is currently in use and this will be made permanent following out investigations:
–DC Stray Current (for corrosion and immunisation –to DC track circuits)
–AC Stray Current (for immunisation – to AC track circuits)
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 11
Resolving Issues - Examples on TLP
• IRJ Arcing?
• Not considered or known about during the initial design
• Currently being monitored and assessed
• Four solutions being investigated, including arc diverters and contactors installed closer to the IRJ
• Arc Diverter in Operation
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 12
Resolving Issues - Examples on TLP
BeforeAfter
• What happens to IRJ arcing when cables are shorten?
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 13
Autotransformer Upgrade on MML
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 14
AT Upgrade on MML• The original Thameslink 2000 concept removed Regents Canal
FS at St Pancras and added AT on MML and ECML (WIP?)
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 15
AT Upgrade on MML• Overview of the 25kV Classic fed system on the MML, with
convention bonding
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 16
AT Upgrade on MML
Kentish Town SATS Grahame Park MPATS
BorehamwoodATFS
Sandridge Road MPTSC
Cricklewood Depot
NGC 400kVNGC 400kV
• Overview of the TLP Autotransformer Upgrade Scheme on the MML, which required enhanced bonding over the complete length
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 17
Autotransformer Staging• The Thameslink Autotransformer installation was broken down into 7
key stages, these are:
– Stage 1 = Install Return Screen Conductor (RSC) & additional Cross Track Bonding (XTB)
– Stage 2 = Switchgear Renewal
– Stage 3 = Remove BT/RC System
– Stage 4 = 1st National Grid (NG) feed installed and commissioned
– Stage 5 = Borehamwood neutral section
– Stage 6 = Full AT System
– Stage 7 = 2nd NG feed installed and commissioned
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 18
Basic Conversion from…..Up
SlowDown Fast
F/02/66F/02/66
B/29/FB/26/S
F/06/22F/06/22
F/08/31F/08/31
F/11/16F/11/18
F/13/19F/13/19
F/16/26F/17/04
F/16/26F/16/31
F/19/33F/20/04
F/19/36F/20/07
F/21/10BF/21/10B
Kentish TownSATS
Grahame ParkFS
BorehamwoodFS
Down Slow
Up Fast
Example of how the BT/RC system was converted to a Rail Return with RSC
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 19
Via…..
Additional Cross Track Bonding and RSC
Removal of Booster Transformers
Each section defined between Mid-Point Connections (MPCs)
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 20
And…..
Installation of AT Aerial Feeder
Protection System Changed
Shows route of Telecoms cable that needs to be immunised
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 21
To……
Completed conversion from BT/RC to RSC/ATF
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 22
AT Upgrade on MML• Issues arising:
–Track circuit reliability – Implementation of enhanced bonding causing track circuit failures and bonding failures
–AT Safety Case – effects of AT system on track circuits considered various scenarios inc AC Immunisation at Blackfriars (via the DEA) and levels on DC components of AT transformer inrush. All of these are now included in the Generic Electrification Safety Case
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 23
AT Upgrade on MML
• Grahame Park bonding failure caused by Grid transformer failure at Borehamwood - operational issues in service reduction
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 24
Earthing and BondingChris Wilson
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 25
E&B Issues (1)
• Earthing and Bonding Issues in the Core Area
–Recent issues found currently being investigated
–The design of not just Electrification and Signalling disciplines needed
–Failure to understand the E&B completely could present track circuit reliability issues
• An example of the Thameslink Core Area – the Clerkenwell Tunnels
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 26
E&B Issues (2) – TRR and RC
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 27
E&B Issues (3) – Add EW
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 28
E&B Issues (4) – Station Earths
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 29
E&B Issues (5) – FSP Earthing
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 30
E&B Issues (6) – Telecoms RSC
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 31
E&B Issues (7) – Fire Main
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 32
E&B Issues (8) – Cable Tray
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 33
E&B Issues (9)
• The issue of parallel connections is not an issue just to consider for track circuit reliability.
• Earthing and Bonding
Date 28-01-2014 TLP Electrification and Signalling Interface Issues 34
Any Questions?
