Hitachi Relion 670 Series Applications Manual page 112

Section 7
Impedance protection
RFPEFwZ3: To set the forward fault resistive reach in Ohm/p for the phase-to-earth faults in zone 3.
This may be set identical to zone 2 setting resistive reach.
RFPERvZ3: To set the reverse fault resistive reach in Ohm/p for phase-to-earth faults in zone 3. This
may be set identical to zone 2 setting resistive reach.
RFPPFwZ3: To set the forward fault resistive reach in Ohm/p for phase-to-phase faults in zone 3.
This may be set identical to zone 2 setting resistive reach.
RFPPRvZ3: To set the reverse fault resistive reach in Ohm/p for phase-to-phase faults in zone 3.
This may be set identical to zone 2 setting resistive reach.
TimerSelZ3: To set the zone timer selection mode of zone 3. i.e. Timers separated, Timers linked,
General start, PhSel start, Internal start and External start. The default setting is Timers separated.
OpModetPEZ3: To set the Off/On operation of the phase-to-earth timer of zone 3. The default setting
is Off.
tPEZ3: To set the time delay to trip for phase-to-earth faults in zone 3. It should be set so that it
provides discrimination with the operating time of relays provided in subsequent sections which zone
3 reach of relay being set, overlaps. The default setting is 0.7 s.
OpModetPPZ3: To set the Off/On operation of the phase-to-phase timer of zone 3. The default
setting is Off.
tPPZ3: To set the time delay to trip for phase-to-phase faults in zone 3. It should be set so that it
provides discrimination with the operating time of relays provided in subsequent sections which zone
3 reach of relay being set, overlaps. The default setting is 0.7 s.
Zone 4
OpZ4: For the Off/On operation of zone 4 and it is set to Off by default. This can be used as reverse
zone.
DirModeZ4: To set the zone 4 direction mode. It can be set to Non-directional, Forward and Reverse.
PhSelModeZ4: To enable the measuring loops of zone 4. It can be set to Phsel logic, Release L1E,
ReleaseL2E, Release PE, Release L1L2 and Release PE&PP modes. The default setting is Phsel
logic mode.
LCModeZ4: To enable/disable the adaptive load compensation mode of zone 4. It avoids
overreaching of the zone in to the next section in case of resistive fault due to remote end feed.
Generally, this setting is not needed for zone 4. The default setting is Off.
X1FwZ4: To set the forward positive sequence reactance reach of zone 4 in Ohm/p. It may be set
identical to X1RvZ4.
X1RvZ4: 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: To set the earth return compensation factor for resistance of zone 4. It provides zero
sequence compensation for phase-to-earth faults.
XEoverXLZ4: To set the earth return compensation factor for reactance of zone 4. It provides zero
sequence compensation for phase-to-earth faults.
RFPEFwZ4: 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: 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.
106
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1MRK506375-UEN Rev. N
GUID-E42EF947-C601-494A-B561-390BBF616356 v4
Railway application RER670
Application manual