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

Section 11
Testing functionality by secondary injection
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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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11.8.2.2

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
5. Repeat steps
BLKU 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
a
IECEQUATION00022 V2 EN-US
7. Compare the result with the set value of the negative-sequence operating current.
Consider that the set value
136
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
2
⋅ U = U + a ⋅ 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
× = + 2 × + ×
I I a I a I
2
L 1 L 2 L
,
I and I
L 1 L 2 L 3
p ×
2
j
= × = - +
1 e 0, 5 . j
3
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U
L3
are the measured phase voltages
3
2
3U2> is in percentage of the base voltage UBase ).
3
are the measured phase currents
3
2
3I2< is in percentage of the base current IBase .
1MRK 511 403-UEN E
M1405-46 v12
(Equation 27)
(Equation 28)
Bay control REC670
Commissioning manual