Table 407: 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 re-
set
x
x
Available for all operate time curves
(3) Inverse reset
x
x
Available only for ANSI and user
programmable curves
4.2.2.8
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 function indicates with the
DIRECTION
output whether the operating quantity is within the forward or reverse operation
sector or within the non-directional sector.
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.
1MRS757644 H
Protection functions
620 series
Technical Manual
401
