distribution of traction return current
TRANSCRIPT
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A seminar on
distribution of traction return current in AT
presented by
Manjeet Malav
EE final year
09EEJEE026
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contents• Introduction
• Track circuit
• Description of track circuit
• Longitudinal section of railway system
• System analysis
• conclusion
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introduction• Complexity of railway system increasing day by day
which requires simulation based technique to
ensure electrical compatibility of the whole
electrical system .
• New and old locomotives are in operation on the
same line.
• The path of traction return current flowing from
rolling stock axels back to the supply is composed
of traction rails.
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Track circuit
Double rail with insulating joints and impedance bondsTx = transmitterRx = receiver
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Description of track circuit
• Transmitter –
It applies a differential voltage to the rails.
• Receiver –
picks up the voltage across the rails at the other
end of the loop.
• Double rail track circuits with impedance bonds
use IRJs on both rails and the return current flows
back through the impedance bonds.
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Longitudinal section of railway system
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Modeled electrical parameters values
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System analysis• Variables which are computed
V1rr , V2rr = voltage b/w rails
Ier , Iir = current in the rails
Iro , Irg = current in return conductors
IE = stray current
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Fig. Rail current track 1
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conclusion• Only a small portion of the return current flows
through the rails.
• System resonance may occur inside the frequency
band.
• The amount of current leaving the system is
proportional to the conductance to earth.
• The earth resistivity does not influence the
distribution of the return current.
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Thank you All