Configure for this reason the STZMPSD to the functional output signal of ZMRPSB function,
which indicates the measured impedance within its external boundaries.
STZML
BLOCK
&
STMZH
STZMPSD
STPSD
t
tDZ
t
tZL
&
>1
&
&
&
-loop
>1
STZMLL
BLKZMH
&
en06000237.vsd
IEC06000237 V1 EN-US
Figure 245: Blocking and tripping logic for evolving power swings
No system oscillation should be detected in power system. Configure for this reason the
STPSD functional input to the START functional output of ZMRPSB function or to any binary
input signal indicating the detected oscillations within the power system.
Configure the functional input STZMUR to the start output of the instantaneous
underreaching distance protection zone (usually START of distance protection zone 1). The
function will determine whether the start 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 STZMURPS to the start output of the
overreaching distance protection zone (usually START of distance protection zone 2).
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
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 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.
1MRK 505 343-UEN B
Section 7
Impedance protection
377
Application manual
Содержание Relion 670 series
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