ABB Relion REG670, Commissioning Manual

Page: 207 / 262

12.9.2.2 Measuring the operate value for the negative sequence function
M1405-46 v11
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
2 1
2 ⋅ + ⋅ + ⋅ U U U U
L L2 L3
= a a
EQUATION707 V2 EN-US
(Equation 105)
Where:
U
L1
, U
L2
and U
L3
IEC00000275 V1 EN-US
are the measured phase voltages
2
3
3
1 0, 5
2
j
a e j
p
×
= × = - +
.
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 1 and 2 . Then slowly increase the measured current in one phase until the
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):
2
1 2 3
2
3
L L L
I I a I a I
× = + × + ×
IECEQUATION00021 V1 EN-US
(Equation 108)
Where:
1 2 3 L L L
I I and I
,
IECEQUATION00020 V1 EN-US
are the measured phase currents
2
3
3
1 0, 5
2
j
a e j
p ×
= × = - +
.
IECEQUATION00022 V2 EN-US
7. Compare the result with the set value of the negative-sequence operating current.
Consider that the set value 3I2< is in percentage of the base current IBase.
12.9.2.3 Measuring the operate value for the zero-sequence function
M1405-72 v10
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):
1MRK 502 067-UEN B Section 12
Testing functionality by secondary injection
201
Commissioning manual