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2
3
3
1
0, 5
2
j
a
e
j
p
×
= ×
= -
+
.
IECEQUATION00022 V2 EN-US
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
.
9.4.2.3
Measuring the operate value for the zero-sequence function
M1405-72 v11
Measure the operate 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 BLKU 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):
3 U
0
×
U
L1
U
L2
U
L3
+
+
=
IEC00000276 V1 EN-US
(Equation 3)
Where:
U
L1
, U
L2
and U
L3
IEC00000275 V1 EN-US
are the measured phase voltages
4.
Compare the result with the set value of the zero-sequence operating voltage
(consider that the set value
3U0>
is in percentage of the base voltage.)
5.
. Then slowly increase the measured current in one phase
until the BLKU signal disappears.
6.
Record the measured current and calculate the corresponding zero-sequence
current according to the equation (observe that the currents in the equation are
phasors):
0
L1
L2
L3
3
=
I
I
I
I
×
+
+
IECEQUATION00019 V1 EN-US
(Equation 4)
Where:
1
2
3
L
L
L
I
I and I
,
IECEQUATION00020 V1 EN-US
are the measured phase currents
7.
Compare the result with the set value of the zero-sequence operate current.
Consider that the set value
3I0<
is in percentage of the base current
IBase
.
1MRK 511 425-UEN A
Section 9
Testing functionality by secondary injection
Bay control REC650 2.2 IEC
75
Commissioning manual
Содержание RELION REC650
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