ABB RER670 - Page 151

OpDirEnd2: This is used to select the direction mode of the end zone 2. Set this to
Non-directional.
tEnd2
: This is used to set the time delay for the second stage trip. Set this after the
tEnd1 has operated. Since the tEnd1 is set to 2.5s, set it to 3.0s.
OpModeGenSt: This is used to select On/Off of zone timers start by general start
signal. Set this to On.
ZoneCharSym: This is used to set On/Off of the zone symmetry. Set this to
Nonsymmetry.
Start
GUID-E54FB09E-04E4-4290-9F8E-6A1EA0840D37 v1
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.
RFPPStart: This is used to set the forward and reverse resistive reach for PP
starting element. This may be set equal to RFPEStart, which is 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.
REOverRLStart: This is used to set the earth return compensation factor for
resistance of the starting element.
28.01
097.0
151.0
2
1
1
2
1
1
0

















R
R
R
R
L
E
IECEQUATION15052 V1 EN-US (Equation 26)
XEOverXLStart: This is used to set the earth return compensation factor for
reactance of the starting element.
1MRK 506 375-UEN A Section 7
Impedance protection
Railway application RER670 2.2 IEC 145
Application manual