Electrification and Power Supply
Andrea NardinocchiTechnological Design Department
Italferr S.p.A., Rome, Italy
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RAILWAY POWER SUPPLY
• Electrification systems in Europe
• Electrification design criteria – Standard ofInteroperability
• Italian High Speed line example
• Power supply for signalling
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Railway power supply: an integrated system to feed the train
HV POWER LINES SUBSTATIONS CONTACT LINE
REMOTE COMMAND AND CONTROL SYSTEM
TO GUARANTEE A GOOD OPERATION
TRAIN
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greater power/locomotive weight ratio;
less pollution; electricity may also beobtained from renewable sources;
lower locomotive maintenance, personneland energy costs;
greater acceleration and therefore fastercommercial speed with the same maximumspeed.
Main advantages: electrical versus diesel traction
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European electrification systems for conventional lines
3.000 V d.c.
1.500 V d.c.
25 kV 50 Hz
750 V d.c.
15 kV 16.7 Hz
Not electrified
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European electrification systems for high speed lines
25kV ac 50 Hz started in France anddeveloped in Belgium, Spain and Italysupplied directly from the high voltagenational provider network at industrialloads frequency;
15kV 16 2/3 Hz developed in Germanyand supplied from dedicated high voltagenetwork at “railway frequency”
Both of these systems are referred to the Technical Specification of Interoperability (TSI) forEnergy Systems issued by the European Union
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Electrification design criteria
TSI of the energy subsystem defines the main features of the electrictraction system in order to be certified as interoperable.
The main aspects to be evaluated in the electrical design should be:
• Quality of the power collection and voltage to thetrain during operation
• Quality of mechanical interaction between contactline and train pantograph at rated speed
• Reliability, availability during operation• Maintainability and management of the electrical
installations7
Quality of the power collectionThe quality of the power collection during operation should be evaluated withthe voltage values calculated by integrated simulation programs based onthe train circulation
Voltage CalculationPower absorbed by Train
Voltage Limits
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Quality of mechanical interactionThe quality of mechanical behaviour of the contact line with the train runs atmaximum rated speed should be simulated and measured before operation
Interaction force between overheadcontact line and pantograph
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Reliability, Availability during operationThe Reliability and Availability of the system have to guarantee normaloperation in case of substation or a part of the supply system fault
Redundancy of the powersupply system architecturein case of one substationout of service
Redundancy of thesubstation plant in case onecomponent is out of service
ESS 1 ESS 2 ESS 3 ESS 4 ESS 5 ESS 6
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