ABB REG316 4 Series - Page 305

REG 316*4 1MRB520049-Uen / Rev. F ABB Switzerland Ltd
3-267
F. Setting instructions
Settings: Current and voltage inputs
A three-phase group must be used for the current input.
The following can be set for the voltage input:
· single-phase input using U
RS
· three-phase delta group
· three-phase star group.
Setting: Phi
The angle Phi determines the angle of the slip line and is moni-
tored to detect slip. The impedances Z
A
,
Z
B
and Z
C
lie on this
line.
Phi is also used to check power direction, i.e. the polarity of the
c.t’s:
60°... 90° c.t. neutral on the line side
i.e. connection according to Fig. 12.4
240°...270° c.t. neutral on the generator side.
Setting: Z
A
Z
A
is the impedance of the slip line and marks the limit of zone 2.
It is also used for measuring phase-angle (see ‘WarnAngle’ and
‘TripAngle’).
Z
A
should be set to the impedance between the location of the
protection and the off-load voltage of the equivalent circuit for the
entire power system.
Setting: Z
B
Z
B
is the impedance of the slip line in the reverse direction and
marks the limit of zone 1. It is also used for measuring phase-
angle (see ‘WarnAngle’ and ‘TripAngle’).
Z
B
should be set to the generator reactance X
d
' in the reverse di-
rection (negative sign).
Setting: Z
C
Z
C
divides the slip line into two zones. Zone 1 lies between Z
B
and Z
C
and zone 2 between Z
C
and Z
A
.
Z
C
should be set to the impedance from the location of the pro-
tection up to the first busbar.