IEEE Electrification Magazine - September 2013 - 5

- onclusions of this work can be directly extrapolated to
c
direct current (dc). Figure 1 shows the structure of the
electrification of a railway line in ac.
From an electrical standpoint, the railway line is
divided into sections that are electrically separated
from each other by short lengths without feeding,
which are called neutral zones. Generally, the highspeed lines are fed from the three-phase, high-voltage
network through traction substations, which usually
feed to two subsectors by separate transformers, as
depicted in Figure 1. Along the line, the phases, which
feed the consecutive subsectors, are swapped to reduce
imbalances in the grid. As previously stated, a sector is
defined as the extension of railway line fed by the same

traction substation. For the sake of reliability, the traction substations are designed to allow simultaneous
feeding to two subsectors using a unique transformer
so that each subsector supports the adjacent subsectors. In failure situations, the control center may perform the appropriate maneuvers to change the topology
of the electrification and thus isolate the fault. Regarding the magnitude of the consumption of the highspeed lines, the railway electrification is connected
to the transmission or delivery network (132, 220, or
400 kV depending on the national system) to reduce the
impact of railway loads on the network.
In the case of ac electrification, each of the subsectors
can employ either mono- or bivoltage feed systems. The
	

IEEE Electrific ation Magazine / s ep t em be r 2 0 1 3

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Table of Contents for the Digital Edition of IEEE Electrification Magazine - September 2013

IEEE Electrification Magazine - September 2013 - Cover1
IEEE Electrification Magazine - September 2013 - Cover2
IEEE Electrification Magazine - September 2013 - 1
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IEEE Electrification Magazine - September 2013 - Cover3
IEEE Electrification Magazine - September 2013 - Cover4
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https://www.nxtbook.com/nxtbooks/pes/electrification_december2017
https://www.nxtbook.com/nxtbooks/pes/electrification_september2017
https://www.nxtbook.com/nxtbooks/pes/electrification_march2018
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