2
2
3
A
B
C
V
V
a V
a V
×
=
+
×
+ ×
EQUATION1818-ANSI V1 EN
(Equation 13)
Where:
A
B
C
and
V V
V
EQUATION1820-ANSI V1 EN
= the measured phase voltages
a
1 e
j
2
p
×
3
-----------
×
0 5 j
3
2
-------
+
,
–
=
=
EQUATION709 V1 EN
4.
Compare the result with the set value (consider that the set value
3V2PU
is in
percentage of the base voltage
VBase
) of the negative-sequence operating voltage.
6.7.2.3
Measuring the operate value for the zero-sequence function
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.
0
3
A
B
C
V
V
V
V
×
=
+
+
EQUATION1819-ANSI V1 EN
(Equation 16)
Where:
A
B
C
and
V V
V
EQUATION1820-ANSI V1 EN
= the measured phase voltages.
4.
Compare the result with the set value (consider that the set value
3V0Pickup
is in
percentage of the base voltage of the zero-sequence operating voltage.
6.7.2.4
Checking the operation of the dv/dt and di/dt based function
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.
Change the voltages in all three phases simultaneously.
The voltage change must be greater than the set value for
DVPU
and the current
constant below the set value for
DIPU
.
1MRK 506 331-UUS A
Section 6
Testing functionality
101
Commissioning Manual
Содержание Relion 650 Series REL650
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