Hitachi Relion 670 Series Applications Manual page 100

Section 7
Impedance protection
ArgDir: The angle of setting in the fourth quadrant. The default setting is 15 deg and it should not be
changed unless system studies show the necessity.
Zone 1
OpZ1: For the Off/On operation of zone 1 and it is set to On by default.
DirModeZ1: To set the zone 1 direction mode. It can be set to Non-directional, Forward and Reverse.
The Forward direction mode is set by default.
PhSelModeZ1: To enable the measuring loops of zone 1. 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.
LCModeZ1: 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: 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: To set the reverse positive sequence impedance reach of zone 1 in Ohm/p. It may be set
identical to X1FwZ1.
REoverRLZ1: To set the earth return compensation factor for resistance of zone 1. It provides zero
sequence compensation for phase-to-earth faults.
XEoverXLZ1: To set the earth return compensation factor for reactance of zone 1. It provides zero
sequence compensation for phase-to-earth faults.
RFPEFwZ1: 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: 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: 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: 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: 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: To set the Off/On operation of the phase-to-earth timer of zone 1. The default setting
is Off.
tPEZ1: To set the time delay to trip for phase-to-earth faults in zone 1. The default setting is 0.0s.
OpModetPPZ1: To set the Off/On operation of the phase-to-phase timer of zone 1. The default
setting is Off.
tPPZ1: To set the time delay to trip for phase-to-phase faults in zone 1. The default setting is 0.0s.
Zone 2
OpZ2: For the Off/On operation of zone 2 and it is set to Off by default.
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