Directional Earth-Fault Characteristics - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.2.2.9
428
Table 483: Reset time characteristics supported by different stages
Reset curve type DEFLPDEF
(1) Immediate
(2) Def time reset
(3) Inverse reset

Directional earth-fault characteristics

Phase angle characteristic
The operation criterion phase angle is selected with the Operation mode setting using
the value "Phase angle".
When the phase angle criterion is used, the DIRECTION output indicates on which
operating sector the operating quantity is measured. The FAULT_DIR output
indicates in which operation sector the fault current is measured. The output is
operational once the function is started.
The forward and reverse sectors are defined separately. The forward operation area is
limited with the Min forward angle and Max forward angle settings. The reverse
operation area is limited with the Min reverse angle and Max reverse angle settings.
The sector limits are always given as positive degree values.
In the forward operation area, the Max forward angle setting gives the clockwise
sector and the Min forward angle setting correspondingly the counterclockwise
sector, measured from the Characteristic angle setting.
In the reverse operation area, the Max reverse angle setting gives the clockwise sector
and the Min reverse angle setting correspondingly the counterclockwise sector,
measured from the complement of the Characteristic angle setting (180 degrees phase
shift) .
The relay characteristic angle (RCA) is set to positive if the operating current lags the
polarizing quantity. It is set to negative if it leads the polarizing quantity.
DEFHPDEF
x x
x x
x x
1MRS759142 C
Note
Available for all operate time curves
Available for all operate time curves
Available only for ANSI and user
programmable curves
Technical Manual
REX640