Directional Ground-Fault Characteristics - ABB 615 series Technical Manual

Section 4
Protection functions
4.2.2.8
340
Table 350: Reset time characteristics supported by different stages
Reset curve type 67/51N
(1) Immediate
(2) Def time reset
(3) Inverse reset

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.
67/50N
x x
x x
x x
1MAC059074-MB A
Note
Available for all operate time curves
Available for all operate time curves
Available only for ANSI and user
programmable curves
615 series ANSI
Technical Manual