ABB RELION RET670, Applications Manual

Page: 472 / 1016

Configure the functional input PUZMUR to the pickup output of the instantaneous
underreaching distance protection zone (usually PICKUP of distance protection zone
1). The function will determine whether the pickup signal of this zone is permitted to
be used in further logic or not, dependent on time difference on appearance of
overreaching distance protection zone (usually zone 2).
Configure for this reason the functional output signal PUZMURPS to the pickup
output of the overreaching distance protection zone (usually PICKUP of distance
protection zone 2).
Functional output PUZMLL replaces the pickup (and trip) signals of the distance
protection zone 1 in all following logic. Configure it accordingly within the logic.
Functional output signal BLKZMOR should be configured to block the overreach
distance protection zone (generally zone 2) in order to prevent its maloperation during
the first swinging of the system. Configure it accordingly to BLOCK functional input
of distance protection zone 2.
Setting calculations
SEMOD131360-70 v1
Setting of the differentiating timer tDZ influences to a great extent the performance of
the protection during the power swings, which develops by occurrence and clearance
of the faults on adjacent power lines. It is necessary to consider the possibility for the
faults to occur close to the set reach of the underreaching distance protection zone,
which might result in prolonged operate times of zone 1 (underreaching zone)
compared to zone 2 pickuped time (overreaching zone). A setting between 80 and 150
ms is generally sufficient.
The release timer tZL permits unconditional operation of the underreaching zone, if the
measured impedance remains within its operate characteristic longer than the set time
tZL . Its setting depends on the expected speed of the initial swings and on the setting of
the time delay for the overreaching zone 2. The release timer must still permit selective
tripping of the distance protection within the complete network. A setting between 200
and 300 ms is generally sufficient.
8.16 Pole slip protection PSPPPAM (78)
SEMOD156709-1 v2
8.16.1 Identification
SEMOD158949-2 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Pole slip protection PSPPPAM U
cos
78
Section 8
1MRK 504 163-UUS A
Impedance protection
466 Transformer protection RET670 2.2 ANSI
Application manual