Table 536: Reset time characteristics supported by different stages
Reset curve type DEFLPDEF DEFHPDEF Note
(1) Immediate x x Available for all operate time curves
(2) Def time reset x x Available for all operate time curves
(3) Inverse reset x x Available only for ANSI and user pro-
grammable curves
4.2.2.9 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.
1MRS759142 F
Protection functions
REX640
Technical Manual
465
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