Measuring The Operate Value For The Zero-Sequence Function - ABB RELION 670 Series Commissioning Manual

1MRK 505 345-UEN 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 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
10.9.2.3

Measuring the operate value for the zero-sequence function

Measure the operate 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 BLKU 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
⋅ 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
× = + 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
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 .
Testing functionality by secondary injection
(Equation 100)
(Equation 103)
Section 10
M1405-72 v10
167