Pole Slip Protection Pspppam - ABB REL670 2.2 IEC Applications Manual

1MRK 506 369-UEN B
8.16
8.16.1
8.16.2
Line distance protection REL670 2.2 IEC
Application manual
Functional output PUZMLL replaces the start (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
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 starting 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.

Pole slip protection PSPPPAM

Identification
Function description
Pole slip protection
Application
Normally, the generator operates synchronously with the power system, that is, all
the generators in the system have the same angular velocity and approximately the
same phase angle difference. If the phase angle between the generators gets too
large the stable operation of the system cannot be maintained. In such a case the
generator loses the synchronism (pole slip) to the external power system.
The situation with pole slip of a generator can be caused by different reasons.
A short circuit occurs in the external power grid, close to the generator. If the fault
clearance time is too long, the generator will accelerate so much, so the
Impedance protection
IEC 61850 IEC 60617
identification identification
PSPPPAM U
cos
Section 8
SEMOD131360-70 v1
SEMOD156709-1 v2
SEMOD158949-2 v4
ANSI/IEEE C37.2
device number
78
SEMOD143248-4 v3
423