ABB RER670 - Page 138

X1RvZ4: This is used to set the reverse positive sequence impedance reach of zone
4 in Ohm/p. It should be set less than zone 1 reach of distance protection for the
shortest line in the reverse direction.
REoverRLZ4: This is used to set the earth return compensation factor for resistance
of zone 4. It provides zero sequence compensation for phase-to-earth faults.
XEoverXLZ4: This is used to set the earth return compensation factor for reactance
of zone 4. It provides zero sequence compensation for phase-to-earth faults.
RFPEFwZ4: This is used to set the forward fault resistive reach in Ohm/p for the
phase-to-earth faults in zone 4. This may be set identical to RFPERVZ4.
RFPERvZ4: This is used to cover the zone 4 fault resistive reach in Ohm/p for
phase-to-earth faults in reverse direction. It should cover apparent phase-to-earth
bus fault resistance allowing for multiple infeed from other circuits. Therefore, it
should be set identical to zone 3 resistive reach setting.
RFPPFwZ4
: This is used to set the forward fault resistive reach in Ohm/p for
phase-to-phase faults in zone 4. This may be set identical to RFPPRVZ4.
RFPPRvZ4: This is used to cover the zone 4 fault resistive reach in Ohm/p for
phase-to-phase faults in reverse direction. It should cover apparent phase-to-phase
bus fault resistance allowing for multiple infeed from other circuits. Therefore, it
should be set identical to zone 3 resistive reach setting.
TimerSelZ4: This is used to set the zone timer selection mode of zone 4. i.e. Timers
separated, Timers linked, General start, PhSel start, Internal start and External
start. The default setting is Timers separated.
OpModetPEZ4: This is used to set the Off/On operation of the phase-to-earth timer
of zone 4. The default setting is Off.
tPEZ4: This is used to set the time delay to trip for phase-to-earth faults in zone 4.
It should be set identical to zone 2 timer setting.
OpModetPPZ4: This is used to set the Off/On operation of the phase-to-phase timer
of zone 4. The default setting is Off.
tPPZ4: This is used to set the time delay to trip for phase-to-phase faults in zone 4.
It should be set identical to zone 2 timer setting.
Zone 5
GUID-B9AD6153-0B91-4C1C-AAE1-E387AAC02A98 v2
OpZ5: This is used for the Off/On operation of zone 5 and it is set to Off by default.
This Zone can be used for the permissive overreach scheme along with a
communication channel.
DirModeZ5: This is used to set the zone 5 direction mode. It can be set to Non-
directional, Forward and Reverse. The default setting is Forward direction mode.
Section 7 1MRK 506 375-UEN A
Impedance protection
132 Railway application RER670 2.2 IEC
Application manual