ABB RER670 Applications Manual page 110

Section 7
Impedance protection
104
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.
Zone 2
OpZ2: This is used for the Off/On operation of zone 2 and it is set to Off by default.
DirModeZ2: This is used to set the zone 2 direction mode. It can be set to Non-
directional, Forward and Reverse. The Forward direction mode is set by default.
PhSelModeZ2: This is used to enable the measuring loops of zone 2. 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.
LEModeZ2: This is used to operate the load discrimination characteristic of zone 2.
The default setting is Off.
LCModeZ2: This is used to enable/disable the adaptive load compensation mode of
zone 2. 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 2. The
default setting is Off.
1MRK 506 375-UEN A
GUID-DD64B7C1-6337-4AC5-995C-8C068E1E379D v2
Railway application RER670 2.2 IEC
Application manual