0.8
2
z
n
v tnPE
RFPE
×
=
×
EQUATION1539 V1 EN-US
(Equation 447)
Here is factor 0.8
considered for safety
reasons and:
RFPE
n
phase-to-earth resistive reach setting for a power swing distance protection zone n
in Ω
RFPP
n
phase-to-phase resistive reach setting for a power swing distance protection zone
n in Ω
tnPE
time delay for phase-to-earth fault measurement of power swing distance
protection zone n in
s
tnPP
time delay for phase-to-phase fault measurement of power swing distance
protection zone n in
s
Time-delay for the overreaching power swing zone
SEMOD131360-43 v2
Time delay for the overreaching power swing zone is not an important parameter, if the zone
is used only for the protection purposes at power-swings.
Consider the normal time grading, if the overreaching zone serves as a time delayed back-up
zone, which is not blocked by the operation of Power swing detection (ZMRPSB) function.
Timers within the power swing logic
SEMOD131360-47 v3
Settings of the timers within Power swing logic (PSLPSCH) depend to a great extent on the
settings of other time delayed elements within the complete protection system. These
settings differ within different power systems. The recommended settings consider only the
general system conditions and the most used practice at different utilities. It is always
necessary to check the local system conditions.
The carrier send timer
tCS is used for safety reasons within the logic. It requires continuous
presence of the input signal STPSD, before it can issue a carrier send signal. A time delay
between 50 and 100 ms is generally sufficient.
The trip timer
tTrip is used for safety reasons within the logic. It requires continuous presence
of the input signal STPSD, before it can issue a tripping command during the power swings. A
time delay between 50 and 100 ms is generally sufficient.
The blocking timer
tBlkTr prolongs the presence of the BLKZMOR output signals, which can be
used to block the operation of the power swing zones after the detected single-phase-to-earth
faults during the power swings. It is necessary to permit the O/C EF protection to eliminate
the initial fault and still make possible for the power swing zones to operate for possible
consecutive faults. A time delay between 150 and 300 ms is generally sufficient.
7.15.3.2
Blocking and tripping logic for evolving power swings
SEMOD131360-55 v3
The second part of a complete Power swing logic (PSLPSCH) functionality is a blocking and
tripping logic for evolving power swings, see figure
. The simplified logic is
presented in figure
. The logic controls the operation of the underreaching distance
protection zone (Zone 1) at power swings, caused by the faults and their clearance on the
adjacent power lines. The logic should generally be configured between distance protection
zones 1 and 2.
Configuration
SEMOD131360-60 v2
The fault impedance should be detected within the external boundary of Power Swing
Detection (ZMRPSB) function without power swing detected during the entire fault duration.
Section 7
1MRK 505 343-UEN B
Impedance protection
376
Application manual
Содержание Relion 670 series
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