Infrastructure Projects

1

Crossrail Programme

James Greatbanks – Designated Project EngineerNR Crossrail Traction Power Supply Upgrade

jgreatba@bechtel.com

Modelling &

Electrification

2

Crossrail

• Network Rail delivering £2.3bn enhancements:

– 28 station upgrades

– Electrification and power supply upgrade

– Signalling and telecom renewals

– Grade separation and junction improvements

• New journey opportunities and 10% increase in rail capacity

• Up to 24 tph, each train 200m carrying up to 1500 passengers

• £14.9bn contributing £42bn in benefits

3

Electrification and PSU

• 85 stkm Series 1 OLE

• 2 x 400kV supply points

• Autotransformer feeding: Stratford to Shenfield (30km) & Paddington to Maidenhead (40km)

• £200m KENSAL GREEN400kV Supply Point

PUDDING MILL LANE400kV Supply Point

Maidenhead MPATS

Slough ATSHayes SATS

West EalingATS

WestbourneParkATS

StepneyGreenSATS Plumstead ATS

Ilford SATS

Gidea Park SATS

Shenfield MPATS

4

Electrification Modelling• Supply point loads

• Equipment loading

• Voltage profile

• Rail voltage

• Induced voltage

• Stray current

• Conducted interference

• Radiated emissions

• Train performance

• Earth potential rise

• Earth leakage

• Electrolytic corrosion

• Thermal loads

• Resonance

• Screening

• Staging / phasing

• Import and export

• Failure modes

5

Project Lifecycle

GRIP – Governance for Railway Investment Projects

Staging Commissioning

Hazard Management

RatingsTimetable / Outputs

System Design

6

System Design

TimetableRoute

Standards + Policy400kV Grid

System Design

Options:- E&B Design

- HV Equipment-OLE Sectioning

-Telecoms-Signalling

Outline DesignAIP

Detailed Design

System DesignRolling Stock

7

System Design - Timetable

8

System Design - Demand

Kensal Green Supply Point

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Time of Day

Half H

our A

vera

ge Loa

d (M

VA)

30 MVA

67MVA65MVA

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System Design – Train Voltage

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System Design – Short Circuit

Kensal Green ATFS

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System Design – Rail Voltage

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System Design – Rail Voltage

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System Design – S&T Circuits

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AC/DC: South East Section

2km

Parallel AC and DC lines

New station

Engineering Connection

• Stray 50Hz

• Induced 50Hz

• Bridge bonding

• Stray DC / corrosion

15

AC/DC: Conclusions

• Corrosion Rates [ATS earth mat, OLE foundations, bridge foundations]: 3000 – 10000 years

• Negligible 50Hz

• No requirement for screening conductor on NKL

• No requirement for VLDs

• No insulation in OLE masts

• Isolation transformer at Abbey Wood station

• One new rectifier

• Measurments

16

Hazard Specific Modelling

• Inductive and conductive coupling to third parties

–London Underground

–DLR

–Heathrow baggage and air side services tunnels

• ATF cables

• Mark 3B OLE

• Reed track circuits

• Depot bonding

• Harmonic Resonance

17

Third Parties

•Joint Crossrail Ltd / Network Rail study•Multi-frequency coupling•Tailored to ‘victim’ equipment

18

Third Parties

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Third Parties

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ATF Cable

• Crossrail ATF is 12% cable

• Δ system design / outline design

• Earthing ATF cable at both ends

• ATF cable and S&T separation

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Distance from Paddington (km)

ATF

/ S&

T Se

para

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(m)

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ATF Cable

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Summary

• System Design as early as possible

• Change is inevitable, so build in allowances

• Change to scheme outputs = big impact

• Modelling required throughout the project lifecycle

• Engage sensitive third parties

• Use system boundaries rather than contract boundaries

• Limited number of suppliers

• Shortage of resource

• Modelling £ < Testing £££