Measuring The Operate Value For The Zero-Sequence Function - ABB RET650 Series Commissioning Manual
Relion 650 series transformer protection
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Also See for RET650 Series:
- Technical manual (670 pages) ,
- Applications manual (392 pages) ,
- Commissioning manual (110 pages)
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Section 7
Testing functionality
Observe that the currents in the equation are phasors.
×
3
ANSIEQUATION00021 V1 EN-US
Where:
I
ANSIEQUATION00020 V1 EN-US
a
IECEQUATION00022 V1 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.
7.7.1.3
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.
×
3
EQUATION1819-ANSI V1 EN-US
Where:
V V
EQUATION1820-ANSI V1 EN-US
4.
Compare the result with the set value (consider that the set value
of the base voltage of the zero-sequence operating voltage.
5.
Repeat steps
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.
×
3
ANSIEQUATION00019 V1 EN-US
Where:
I
ANSIEQUATION00020 V1 EN-US
7.
Compare the result with the set value of the zero-sequence operating current. Consider that
the set value 3I0< is in percentage of the base current IBase.
72
=
+
×
+ ×
2
I
I
a
I
a I
2
A
B
C
,
I and I
A
B
C
p ×
2
3
j
= ×
= -
+
1
e
0, 5
j
3
2
=
+
+
V
V
V
V
0
A
B
C
V
and
A
B
C
1
and 2. Then slowly increase the measured current in one phase until the BLKV
+
+
I
=
I
I
I
0
A
B
C
,
I and I
A
B
C
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= the measured phase currents
= the measured phase voltages
3V0Pickup is in percentage
= the measured phase currents
Transformer protection RET650
1MRK 504 136-UUS B
(Equation 22)
M1405-72 v7
(Equation 25)
(Equation 27)
Commissioning manual
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