Table 350:
Reset time characteristics supported by different stages
Reset curve type
67/51N
67/50N
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
programmable curves
4.2.2.8
Directional ground-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.
Section 4
1MAC059074-MB A
Protection functions
340
615 series ANSI
Technical Manual
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