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.
1MRK 506 375-UEN A
Section 7
Impedance protection
Railway application RER670 2.2 IEC
121
Application manual
Summary of Contents for RELION RER670
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