ABB RER670 - Page 123

LCModeZ1: This is used to enable/disable the adaptive load compensation mode of
zone 1. It avoids overreaching of the zone in to the next section in case of resistive
fault due to remote end feed. The default setting is Off.
X1FwZ1: This is used to set the forward positive sequence reactance reach of zone
1 in Ohm/p. It should be set so that it never overreaches the protected line. The
recommended setting is 80% of the protected line length.
X1RvZ1: This is used to set the reverse positive sequence impedance reach of zone
1 in Ohm/p. It may be set identical to X1FwZ1.
REoverRLZ1: This is used to set the earth return compensation factor for resistance
of zone 1. It provides zero sequence compensation for phase-to-earth faults.
XEoverXLZ1: This is used to set the earth return compensation factor for reactance
of zone 1. It provides zero sequence compensation for phase-to-earth faults.
RFPEFwZ1: This is used to set the forward fault resistive reach in Ohm/p for the
phase-to-earth faults in zone 1. It should be set to give maximum coverage
considering the line resistance, arc resistance and tower footing resistance. In
general, resistive reach should be set to give maximum coverage subject to check
possibility against load point encroachment considering minimum expected voltage
and maximum load. In case of short lines, consideration has to be given to
overreach due to remote end infeed and reach in resistance direction is restricted.
RFPERvZ1: This is used to set the reverse fault resistive reach in Ohm/p for phase-
to-earth faults in zone 1. It may be set identical to RFPEFwZ1.
RFPPFwZ1: This is used to set the forward fault resistive reach in Ohm/p for
phase-to-phase faults in zone 1. It should be set to cover the arc resistance for
phase-to-phase faults.
RFPPRvZ1: This is used to set the reverse fault resistive reach in Ohm/p for phase-
to-phase faults in zone 1. It may be set identical to RFPPFwZ1.
TimerSelZ1
: This is used to set the zone timer selection mode of zone 1. i.e. Timers
separated, Timers linked, General start, PhSel start, Internal start and External
start. The default setting is Timers separated.
OpModetPEZ1: This is used to set the Off/On operation of the phase-to-earth timer
of zone 1. The default setting is Off.
tPEZ1: This is used to set the time delay to trip for phase-to-earth faults in zone 1.
The default setting is 0.0s.
OpModetPPZ1: This is used to set the Off/On operation of the phase-to-phase timer
of zone 1. The default setting is Off.
tPPZ1: This is used to set the time delay to trip for phase-to-phase faults in zone 1.
The default setting is 0.0s.
1MRK 506 375-UEN A Section 7
Impedance protection
Railway application RER670 2.2 IEC 117
Application manual