Measuring The Trip Value For The Zero-Sequence Function - ABB RET670 Commissioning Manual

1MRK 504 154-UUS B
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):
×
3
EQUATION1818-ANSI V1 EN-US
Where:
V V
EQUATION1820-ANSI V1 EN-US
a
IECEQUATION00022 V2 EN-US
4. Compare the result with the set value of the negative-sequence operating voltage (consider
that the set value
5. Repeat steps
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):
×
3
ANSIEQUATION00021 V1 EN-US
Where:
I
ANSIEQUATION00020 V1 EN-US
a
IECEQUATION00022 V2 EN-US
7. Compare the result with the set value of the negative-sequence operating current. Consider
that the set value
10.9.2.3

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):
Commissioning manual
2
= + × + ×
V V a V a V
2 A B C
V
and
A B C
p ×
2
j
= × = - +
1 e 0, 5 . j
3
3V2PU is in percentage of the base voltage VBase ).
1 and 2. Then slowly increase the measured current in one phase until the BLKV
= + 2 × + ×
I I a I a I
2
A B C
,
I and I
A B C
p ×
2
j
= × = - +
.
1 e 0, 5 j
3
3I2< is in percentage of the base current IBase .
are the measured phase voltages
3
2
are the measured phase currents
3
2
Testing functionality by secondary injection
(Equation 103)
(Equation 106)
Section 10
M1405-72 v10
183