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1MRK 504 165-UEN Rev. K
condition. It can be done by increasing current in one of the phases without disturbing healthy
phase currents.
3.
With this condition, I0CHECK connected to STPE output of FDPSPDIS, FRPSPDIS, ZMFPDIS
or ZMFCPDIS function, will be activated and I0CHECK should be activated before the
expiration of timer tR1.
4.
By doing this, the output START will be disappeared after a set time delay of tR1.
5.
If required to block inhibit of start output by the presence of residual current, BLKI02 must be
configured to TRUE and thereby, the output signal START will be maintained as long as the
power swing condition exists.
Inhibit START output by the presence of slow power swings
Preconditions
The input signal BLKI01, block inhibit of the start output for slow power swings is connected to
FALSE.
1.
Create a test sequence such that the power swing should be detected . This can be done by
referring to steps 5, 6, and 7 described in section
ZMBURPSB
all three phases. With this condition, the output signal START will be activated.
2.
After expiration of the set time delay by a timer tR2, the output START will disappear.
3.
If required to block inhibit of start output by the presence of slow power swings, BLKI01 must
be configured to TRUE. Thereby, the output signal START will be maintained as long as the
power swing condition exists.
Inhibit START output by the single pole reclosing
Preconditions
The input signal I0CHECK, residual current (3I0) detection used to inhibit the start output, must be
configured to the output signal STPE on the FDPSPDIS, FRPSPDIS, ZMFPDIS or ZMFCPDIS
function.
The input signal BLKI02, block inhibit of the start output for subsequent residual current detection
and BLKI01, block inhibit of the start output for slow power swings must be connected to TRUE.
1.
Create a phase-to-earth fault such that the input signal I0CHECK will be activated and a trip
signal from any impedance protection function will be generated.
2.
With this condition, the input signal TRSP connected to a tripping function is activated.
3.
Clear the fault by injecting zero current magnitude in the fault phase and maintain healthy
conditions in other phases. With this, I0CHECK and TRSP will be deactivated.
4.
Make a test sequence to create power swing condition in healthy phases in accordance with
steps 5, 6, and 7 described in section
With this condition, the output signal START will be activated.
5.
Repeat step
6.
Steps
exist a two phase power swing during single pole autoreclosing time and then switched-on-to
the persistent phase-to-earth fault after single pole autoreclosing time.
7.
By doing this, the output signal START will be inhibited.
8.
If I0CHECK appears the expiration of a timer tEF, the condition will be seen as power swing
and thereby, the output signal START will be maintained as long as the power swing exists in
the power system.
Testing the power swing unblocking logic
Preconditions
The following output signals shall be configured to binary outputs: FLTL1, FLTL2, FLTL3, FLT1PH,
FLT2PH, FLT3PH and START.
Transformer protection RET670
Commissioning manual
and inject voltage in one of the phases accordingly by keeping constant current in
1
to create phase-to-earth fault and thereby, I0CHECK will be activated again.
4
and
5
must be performed before the expiration of set time delay of tEF. There may
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Testing the power swing detection logic
Testing the power swing detection logic ZMBURPSB
Section 11
Testing functionality by secondary injection
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GUID-B7B8DBCE-9945-4C1A-8319-96920DC31DCA v1
GUID-1B635221-493D-4DB3-938C-6C61461E3B16 v1
.
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