Measuring The Trip Value For The Negative Sequence Function - ABB Relion 670 Series Commissioning Manual

1MRK 511 403-UUS Rev. K
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5. Disconnect the dc voltage from the MCBOP binary input terminal.
6. Disconnect one of the phase voltages and observe the logical output signals on the binary outputs
of the IED.
BLKV and BLKZ signals should appear simultaneously wether the BLKV and BLKZ reset depends
on the setting SealIn "on" or "off". If "on" no reset, if "off" reset.
7. After more than 5 seconds disconnect the remaining two-phase voltages and all three currents.
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8. Establish normal voltage and current operating conditions simultaneously and observe the
corresponding output signals.
They should change to logical 0 as follows:
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11.9.2.2

Measuring the trip value for the negative sequence function

Measure the trip value for the negative 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 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 3V2PU is in percentage of the base voltage VBase).
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
Bay control REC670
Commissioning manual
The BLKVand BLKZ signals should appear without any time delay.
All undervoltage-dependent functions must be blocked.
There should be no change in the high status of the output signals BLKV and BLKZ.
The signal 3PH will appear.
Signal 3PH after about 25ms
Signal BLKV after about 50ms
Signal BLKZ after about 200ms
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
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
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are the measured phase voltages
3
2
Section 11
Testing functionality by secondary injection
(Equation 38)
(Equation 39)
M1405-46 v12
159