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1MRK 511 366-UUS -
11.8.2.3
Commissioning manual
2
×
=
+
×
3
V
V
a V
2
A
B
EQUATION1818-ANSI V1 EN
Where:
V V
V
and
A
B
C
EQUATION1820-ANSI V1 EN
p ×
2
j
= ×
= -
a
1
e
0, 5
3
IECEQUATION00022 V2 EN
4.
Compare the result with the set value of the negative-sequence operating voltage
(consider that the set value 3V2PU is in percentage of the base voltage VBase).
5.
Repeat steps
1
and 2. Then slowly increase the measured current in one phase until
the BLKV signal disappears.
6.
Record the measured current and calculate the corresponding negative-sequence
current according to the equation (observe that the currents in the equation are
phasors):
×
=
+
2
×
+ ×
3
I
I
a
I
2
A
B
ANSIEQUATION00021 V1 EN
Where:
,
I
I and I
A
B
C
ANSIEQUATION00020 V1 EN
p ×
2
j
= ×
= -
a
1
e
0, 5
3
IECEQUATION00022 V2 EN
7.
Compare the result with the set value of the negative-sequence operating current.
Consider that the set value 3I2< is in percentage of the base current IBase.
Measuring the trip value for the zero-sequence function
Measure the trip value for the zero-sequence function, if included in the IED.
1.
Simulate normal operating conditions with the three-phase currents in phase with
their corresponding phase voltages and with all of them equal to their rated values.
2.
Slowly decrease the measured voltage in one phase until the BLKV signal appears.
3.
Record the measured voltage and calculate the corresponding zero-sequence voltage
according to the equation (observe that the voltages in the equation are phasors):
Testing functionality by secondary injection
+ ×
a V
C
are the measured phase voltages
3
+
.
j
2
a I
C
are the measured phase currents
3
+
.
j
2
Section 11
(Equation 94)
(Equation 97)
151
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