ABB RER670 - Page 159

input card is used to automatically convert the measured secondary input signals to
primary values used in ZGTPDIS.
Default values mentioned below should be validated for each application and
appropriate setting values should be adopted.
Parameters for ZGTPDIS application function are set via local HMI or Protection
and Control Manager PCM600.
Common base IED values for primary current (IBase), primary voltage (UBase)
and primary power (SBase) are set in the global base values for settings function
GBASVAL.
GlobalBaseSel
: This is used to select GBASVAL function for reference of base
values.
Operation: This is used for underimpedance protection Off/On.
ImpCharAng: This is to set the common characteristic angle for all three zones of
underimpedance element. ImpCharAng should match the associated transformer
impedance angle.
IMinOp: This is to select the minimum operating current for underimpedance
element. If the minimum current is exceeded, underimpedance protection
calculates the impedance. A default setting of 10% of IB is recommended.
Zone 1
OpModeZ1: This is to select the operating characteristic of zone 1 underimpedance
element. This can be selected as Off/Mho offset/Quad non-dir.
Z1Fwd: This is to set the zone 1 forward positive sequence impedance reach in
ohm/p. It is recommended to set this to 70% of transformer impedance.
Z1Rev: This is to set the zone 1 reverse positive sequence impedance reach in
ohm/p. This should be set as 1% of transformer impedance or lower for better
security in case of reverse faults.
RFFwZ1: This is to set the zone 1 forward fault resistive reach in ohm/p when
quadrilateral characteristic is chosen. It should be set to give maximum coverage of
fault resistance and the load encroachment (R
Ldmax
).
max
min
max
I
U
R
Ld

IECEQUATION226 V2 EN-US (Equation 34)
RFRevZ1: This is to set the zone 1 reverse fault resistive reach in ohm/p when
quadrilateral characteristic is chosen. It may be set identical to RFFwZ1.
tZ1: This is to set the zone 1 time delay to trip. Default setting is 0.0s.
Zone 2
1MRK 506 375-UEN A Section 7
Impedance protection
Railway application RER670 2.2 IEC 153
Application manual