Arc resistance = 2 Ohm primary and Tower footing resistance = 10 Ohm Primary.
Therefore, RFPEFwZ1 should be minimum of 12 Ohm.
Since the RFPEStart is set to 50.16 Ohm to give more resistive coverage,
RFPEFwZ1 can be set at 0.8 x 50.16 = 40.13 Ohm. However, to avoid overreach
due to the remote end infeed, it is recommended that the resistive reach does not
exceed 4.5 times reactive reach.
Therefore,
RFPEFwZ1 may be set to 4.5 x X1FwZ1 = 4.5 x 5.6 = 25.52 Ohm.
RFPERvZ1: It may be set identical to RFPEFwZ1, which is 25.52 Ohm.
RFPPFwZ1: It should be set to cover the arc resistance for phase-to-phase faults. It
may be set identical to RFPEFwZ1, which is 25.52 Ohm.
RFPPRvZ1: It may be set identical to RFPPFwZ1, which is 25.52 Ohm.
TimerSelZ1: This is used to set the zone timer selection mode of zone 1. Set this to
Timers Separated.
OpModetPEZ1: Set this to On.
tPEZ1: Set this to 0.0s.
OpModetPPZ1: Set this to On.
tPPZ1: Set this to 0.0s.
Zone 2
GUID-5D2EB529-C387-4548-845F-D92D60384327 v1
OpZ2: Set this to On.
DirModeZ2: This is used to set the zone 2 direction mode. Set this to Forward.
PhSelModeZ2: This is used to enable the measuring loops of zone 2. Set this to
Phsel logic.
LEModeZ2: This is used to operate the load discrimination characteristic of zone 2.
Set this to On.
LCModeZ2: This is used to enable/disable the adaptive load compensation mode of
zone 2. Set this to Off.
X1FwZ2: This is used to set the forward positive sequence reactance reach of zone
2 in Ohm/p. This should be set to 120% of line 1 reactance.
Therefore, set the X1FwZ2 to 1.2 x 50 x 0.112 = 6.72 Ohm.
X1RvZ2: Set this identical to X1FwZ2 which is 6.72 Ohm.
REoverRLZ2: It provides zero sequence compensation for phase-to-earth faults.
1MRK 506 375-UEN A Section 7
Impedance protection
Railway application RER670 2.2 IEC 147
Application manual
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