ABB 615 Series ANSI, Technical Manual

Page: 183 / 713

Section 4
1MAC050144-MB C
Protection functions
176 615 series ANSI
Technical Manual
Table 163: Reset time characteristics supported by different stages
4.1.6.8 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 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.
In the forward operation area, the Max forward angle setting gives the clockwise sector
and the Min forward angle setting correspondingly the anti-clockwise 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 anti-clockwise 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.
Reset curve type
Supported by
67/51N and 67/50N-1 67/50N-2 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
The sector limits are always given as positive degree values.