Start
GUID-0305F9F3-4C8A-488C-AA8F-BBCB055FF479 v2
CharStartZ<
: It is used to select the underimpedance start characteristic. Set this to
Quadrilateral
.
X1Start
: This is to set positive sequence reactance reach of the starting element
quadrilateral characteristic. It will be set to operate for all faults within the
protected area.
Therefore, set the
X1Start
to 150% of zone 3 reach. Zone 3 reach being 20.16
Ohm, set
X1Start
to 1.5 x 20.16 = 30.24 Ohm.
RFPEStart
: This is used to set the forward and reverse resistive reach for PE
starting element. It will be set to operate for all faults within the protected area. To
provide maximum coverage for the high resistive faults, it may be set as high as
possible subject to check of possibility against load point encroachment.
Therefore, set this to 80% of the setting
RLd
resistive reach of the starter. The
setting
RLd
being 62.7 Ohm, the
RFPEStart
can be set to 0.8 x 62.7 = 50.16 Ohm.
I0MinOp
: This is the minimum operating current of residual overcurrent start as %
of
IBase
. Set this to 10%
IB
.
KI0Stab
: The stabilizing factor to prevent operation of the residual overcurrent start
caused by an unbalance or dissimilar CT behaviour in the event of high short
circuit currents. Set this to 0.8.
Direction
GUID-464CA6EE-24D9-4F19-972C-F1EE1D4B9FFE v2
ArgNegRes
: This is the angle for blinder in the second quadrant. Set this to 120
deg.
ArgDir
: This is the angle of setting in the fourth quadrant. Set this to 15 deg.
Zone 1
GUID-A055E2EB-4480-4116-BAC4-7132823BD663 v2
OpZ1
: Set this to
On
.
DirModeZ1
: This is used to set the zone 1 direction mode. Set this to
Forward
.
PhSelModeZ1
: This is used to enable the measuring loops of zone 1. Set this to
Phsel logic
.
LEModeZ1
: This is used to operate the load discrimination characteristic of zone 1.
Set this to
On
.
LCModeZ1
: This is used to enable/disable the adaptive load compensation mode of
zone 1. Set this to
On
.
X1FwZ1
: This is used to set the forward positive sequence reactance reach of zone
1 in Ohm/p. The recommended setting is 90% of the protected line length.
Therefore, set the
X1FwZ1
to 0.9 x 50.0 x 0.112 = 5.6 Ohm.
REoverRLZ1
: It provides zero sequence compensation for phase-to-earth faults.
Section 7
1MRK 506 375-UEN A
Impedance protection
138
Railway application RER670 2.2 IEC
Application manual
Summary of Contents for RELION RER670
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