Hitachi Relion 670 Series Applications Manual page 343

1MRK506375-UEN Rev. N
Distance-to-fault can be recalculated on the local HMI by using the measuring algorithm for different
fault loops.
15.10.3.2 Application of traction supply systems
Traction supply system supplies electrical power to the electric locomotive. AC electrification is used
for traction systems which spans for longer distances. Power collection is performed via the
overhead catenary conductor.
There are two types of feeding systems in AC electrification:
• Single phase feeding system
• Auto transformer feeding system
Table 40:
Settings
Outputs
Single phase feeding system
Single phase feeding system is a single phase system. The locomotive collects power from the
catenary and the return current flows back to the source through the rail and return conductor.
Generally, single traction transformer feeds 2-4 tracks in parallel. That is, the load current is shared
by the parallel catenary conductors. Hence, the impedance upto the load is reduced and therefore
the voltage is maintained (as the voltage drop reduces). The classical feeding system is always
operated radially. Example of classical single phase feeding and paralleling post is shown in Figure
165.
IEC17000213 V1 EN-US
Figure 165:
In this system, booster transformers are employed to force the return current to flow through return
conductor instead of the rail. Thus, interference with the communication systems reduces. Example
of classical single phase feeding with booster transformer is shown in Figure 166.
Railway application RER670
Application manual
Settings and outputs of RWRFLO related to traction supply system
SystemType = TractionAT
RC1, XC1, RF1, XF1, RR1, XR1 and TracLineLength are the settings considered
DISTL1E, FLTRL1E, FLTXL1E, DISTL2E, FLTRL2E, FLTXL2E, FLTRL1L2 and FLTXL1L2 are the
related outputs
3‐phase supply
Traction substration
SSP1
Classical single phase feeding diagram with paralleling of tracks at SSPs and SP
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SSP2
Track 1
Track 2
Section 15
Monitoring
GUID-C9BB6E2E-85E0-4273-A9B8-378BA2A62FC1 v2
GUID-4A1D0162-A962-470E-BFF4-65C221ABA267 v2
SP1
IEC17000213-1-en.vsdx
337