ABB RER670 - Page 112

DirModeZ3: This is used to set the zone 3 direction mode. It can be set to Non-
directional,
Forward and Reverse. The Forward direction mode is set by default.
PhSelModeZ3: This is used to enable the measuring loops of zone 3. 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.
LEModeZ3: This is used to operate the load discrimination characteristic of zone 3.
The default setting is Off.
LCModeZ3: This is used to enable/disable the adaptive load compensation mode of
zone 3. 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 3. The
default setting is Off.
X1FwZ3: This is used to set the forward positive sequence reactance reach of zone
3 in Ohm/p. It should be set to overreach the remote terminal of the longest
adjacent line by 20% for all fault conditions.
X1RvZ3: This is used to set the reverse positive sequence impedance reach of zone
3 in Ohm/p. It may be set identical to X1FwZ3.
REoverRLZ3: This is used to set the earth return compensation factor for resistance
of zone 3. It provides zero sequence compensation for phase-to-earth faults.
XEoverXLZ3: This is used to set the earth return compensation factor for reactance
of zone 3. It provides zero sequence compensation for phase-to-earth faults.
RFPEFwZ3: This is used 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: This is used 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: This is used 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: This is used 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: This is used 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: This is used to set the Off/On operation of the phase-to-earth timer
of zone 3. The default setting is Off.
tPEZ3: This is used 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
Section 7 1MRK 506 375-UEN A
Impedance protection
106 Railway application RER670 2.2 IEC
Application manual