ABB RET670 - Setting Parameters; Pole Slip Protection PSPPPAM (78); Application

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.
3.6.12.3 Setting parameters
Table 80: ZMRPSL Group settings (basic)
Name Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Disable/Enable Operation
tDZ 0.000 - 60.000 s 0.001 0.050 Permitted max oper time diff between higher
and lower zone
tDZMUR 0.000 - 60.000 s 0.001 0.200 Delay for oper of underreach zone with
detected diff in oper time
tCS 0.000 - 60.000 s 0.001 0.100 Conditional timer for sending the CS at power
swings
tTrip 0.000 - 60.000 s 0.001 0.100 Conditional timer for tripping at power swings
tBlkTr 0.000 - 60.000 s 0.001 0.300 Timer for blocking the overreaching zones trip
3.6.13 Pole slip protection PSPPPAM (78)
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Pole slip protection PSPPPAM U
cos
78
3.6.13.1 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.
Section 3 1MRK504116-UUS C
IED application
374
Application manual