ABB RER670 Applications Manual page 111

1MRK 506 375-UEN A
Railway application RER670 2.2 IEC
Application manual
X1FwZ2: This is used to set the forward positive sequence reactance reach of zone
2 in Ohm/p. The zone should never underreach the next section. The recommended
setting is 120% of the protected line length. Impact of the mutual coupling should
be considered for the double circuit lines.
X1RvZ2: This is used to set the reverse positive sequence impedance reach of zone
2 in Ohm/p. It may be set identical to X1FwZ2.
REoverRLZ2: This is used to set the earth return compensation factor for resistance
of zone 2. It provides zero sequence compensation for phase-to-earth faults.
XEoverXLZ2: This is used to set the earth return compensation factor for reactance
of zone 2. It provides zero sequence compensation for phase-to-earth faults.
RFPEFwZ2: This is used to set the forward fault resistive reach in Ohm/p for the
phase-to-earth faults in zone 2. This may be set identical to zone 1 setting. In case
of permissive overreach schemes used for short lines, this has to be set higher than
zone 1 resistive reach.
RFPERvZ2: This is used to set the reverse fault resistive reach in Ohm/p for phase-
to-earth faults in zone 2. This may be set identical to zone 1 setting.
RFPPFwZ2: This is used to set the forward fault resistive reach in Ohm/p for
phase-to-phase faults in zone 2. This may be set identical to zone 1 setting.
RFPPRvZ2: This is used to set the reverse fault resistive reach in Ohm/p for phase-
to-phase faults in zone 2. This may be set identical to zone 1 setting.
TimerSelZ2: This is used to set the zone timer selection mode of zone 2. i.e. Timers
separated, Timers linked, General start, PhSel start, Internal start and External
start. The default setting is Timers separated.
OpModetPEZ2: This is used to set the Off/On operation of the phase-to- earth timer
of zone 2. The default setting is Off.
tPEZ2: This is used to set the time delay to trip for phase-to-earth faults in zone 2.
It should be set to coordinate with the clearance of adjacent circuit fault with in
reach by the intended main protection or breaker fail protection. The default setting
is 0.4 s.
OpModetPPZ2: This is used to set the Off/On operation of the phase-to-phase timer
of zone 2. The default setting is Off.
tPPZ2: This is used to set the time delay to trip for phase-to-phase faults in zone 2.
It should be set to coordinate with the clearance of adjacent circuit fault with in
reach by the intended main protection or breaker fail protection. The default setting
is 0.4 s.
Zone 3
OpZ3: This is used for the Off/On operation of zone 3 and it is set to Off by default.
Section 7
Impedance protection
GUID-F4F460B5-ECB1-413F-B00A-0977580BD737 v2
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