![ABB Relion REQ650 Скачать руководство пользователя страница 96](http://html1.mh-extra.com/html/abb/relion-req650/relion-req650_commissioning-manual_3400279096.webp)
6.6.2.2
Measuring the operate value for the negative 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 negative-sequence
voltage according to the equation.
Observe that the voltages in the equation are phasors.
2
2
3
A
B
C
V
V
a V
a V
×
=
+
×
+ ×
EQUATION1818-ANSI V1 EN
(Equation 22)
Where:
A
B
C
and
V V
V
EQUATION1820-ANSI V1 EN
= the measured phase voltages
2
3
3
1
0, 5
2
j
a
e
j
p
×
= ×
= -
+
IECEQUATION00022 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.
5.
Repeat steps
. 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
2
3
A
B
C
I
I
a I
a I
×
=
+
×
+ ×
ANSIEQUATION00021 V1 EN
(Equation 25)
Where:
A
B
C
I
I and I
,
ANSIEQUATION00020 V1 EN
= the measured phase currents
2
3
3
1
0, 5
2
j
a
e
j
p
×
= ×
= -
+
IECEQUATION00022 V1 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.
6.6.2.3
Measuring the operate value for the zero-sequence function
Section 6
1MRK 505 293-UUS A
Testing functionality
88
Commissioning manual