Measuring The Operate Value For The Negative Sequence Function - Hitachi Relion 670 Series Commissioning Manual

1MRK 511 403-UEN Rev. L
6. Disconnect one of the phase voltages and observe the logical output signals on the binary
outputs of the IED.
BLKU and BLKZ signals should appear simultaneously wether the BLKU 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.
•
•
8. Establish normal voltage and current operating conditions simultaneously and observe the
corresponding output signals.
They should change to logical 0 as follows:
•
•
•
11.9.2.2

Measuring the operate value for the negative sequence function

Measure the operate 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 BLKU 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
EQUATION707 V2 EN-US
Where:
IEC00000275 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 3U2> is in percentage of the base voltage UBase).
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
IECEQUATION00021 V1 EN-US
Where:
I
IECEQUATION00020 V1 EN-US
Bay control REC670
Commissioning manual
There should be no change in the high status of the output signals BLKU and BLKZ.
The signal 3PH will appear.
Signal 3PH after about 25ms
Signal BLKU after about 50ms
Signal BLKZ after about 200ms
⋅ U = U + a 2 ⋅ U + ⋅ a
2 L 1 L2
U , U and U
L1 L2 L3
p ×
2
j
= × = - +
1 e 0, 5 . j
3
1 and 2. Then slowly increase the measured current in one phase until the BLKU
× = + × + ×
2
I I a I a I
2
L 1 L 2 L
,
I and I
L 1 L 2 L 3
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U
L3
are the measured phase voltages
3
2
3
are the measured phase currents
Section 11
Testing functionality by secondary injection
(Equation 37)
(Equation 38)
M1405-46 v12
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