ABB RER670 - Page 109

I0MinOp: This is the minimum operating current of residual overcurrent start as %
of IBase. It should be set to detect all earth faults, but above any continuous
residual current under normal operating conditions. The default value is 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. The default setting is 0.8.
REOverRLStart: This is used to set the earth return compensation factor for
resistance of the starting element. It is not applicable for compensated and high
impedance earthed systems.
XEOverXLStart: This is used to set the earth return compensation factor for
reactance of the starting element. It is not applicable for compensated and high
impedance earthed systems.
Direction
GUID-02B0EB72-B881-4FFC-A488-AC5014820F7C v2
Ar
gNegRes: This is the angle for blinder in the second quadrant. The default setting
is 120 deg and it should not be changed unless system studies show the necessity.
Ar
gDir: This is 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
GUID-5889A738-43EE-47DC-85C9-EFD9D837C123 v2
OpZ1: This is used for the Off/On operation of zone 1 and it is set to On by default.
DirModeZ1: This is used 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: This is used 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.
LEModeZ1: This is used to operate the load discrimination characteristic of zone 1.
The default setting is Off.
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.
1MRK 506 375-UEN A Section 7
Impedance protection
Railway application RER670 2.2 IEC 103
Application manual