ABB REG670 Applications Manual page 266

Section 8
Impedance protection
260
These settings, two per zone (x=1,2..5&RV), with options {Off, Quadrilateral, Mho,
Offset}, are used to set the operation and characteristic for phase-to-earth and phase-
to-phase faults, respectively.
For example, in one zone it is possible to choose Mho characteristic for the three Ph-
Ph measuring loops and Quadrilateral characteristic for the three Ph-E measuring
loops.
DirModeZx
These settings define the operating direction for Zones Z3, Z4 and Z5 (the
directionality of zones Z1, Z2 and ZRV is fixed). The options are Non-directional,
Forward or Reverse. The result from respective set value is illustrated in figure
below, where positive impedance corresponds to the direction out on the protected
line.
X
Non-directional
IEC05000182 V2 EN
Figure 133: Directional operating modes of the distance measuring zones 3 to 5
tPPZx, tPEZx, TimerModeZx, ZoneLinkStart and TimerLinksZx
Refer to chapter Simplified logic schemes in Technical Manual for the application of
these settings.
OperationSC
Choose the setting value SeriesComp if the protected line or adjacent lines are
compensated with series capacitors. Otherwise maintain the NoSeriesComp setting
value.
CVTtype
If possible, the type of capacitive voltage transformer (CVT) that is used for
measurement should be identified. Note that the alternatives are strongly related to the
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
X
R
Forward
1MRK 502 071-UEN -
X
R
Reverse
IEC05000182-2-en.vsdx
Application manual
93
R