Measuring The Operate Value For The Zero-Sequence Function; Checking The Operation Of The Du/Dt And Di/Dt Based Function - ABB Relion 650 Series Commissioning Manual

1MRK 505 264-UEN A
Observe that the voltages in the equation are phasors.
3 U
EQUATION707 V1 EN-US
Where:
EQUATION708 V1 EN-US
EQUATION709 V1 EN-US
4. Compare the result with the set value (consider that the set value
of the base voltage
7.6.1.3

Measuring the operate value for the zero-sequence function

Measure the operate value for the zero-sequence function.
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.
3 U
IEC00000276 V1 EN-US
Where:
IEC00000275 V1 EN-US
4. Compare the result with the set value (consider that the set value
of the base voltage of the zero-sequence operating voltage.
7.6.1.4

Checking the operation of the du/dt and di/dt based function

Check the operation of the du/dt and di/dt based function.
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. Connect the nominal dc voltage to the CBCLOSED binary input.
3. Change the voltages and currents in all three phases simultaneously.
The voltage change should be greater then set
less than the set
•
•
4. Apply normal conditions as in step 3.
The BLKU, BLKZ and 3PH signals should reset, if activated, see step
5. Change the voltages and currents in all three phases simultaneously.
Busbar protection REB650
Commissioning manual
2
× ×
U a U a
= + +
2 L 1 L 2
U U and
L1 L2
2 p ×
---------- -
j
3
× ,
------ -
a = 1 e = – 0 5 + j
2
UBase ) of the negative-sequence operating voltage.
×
= U + U + U
0 L1 L2 L3
U , U and U
L1 L2 L3
DI< .
The BLKU and BLKZ signals appear without any time delay. The BLKZ signal will be
activated, only if the internal deadline detection is not activated at the same time.
3PH should appear after 5 seconds, if the remaining voltage levels are lower than
UDLD< of the DLD function.
the set
© Copyright 2011 ABB. All rights reserved
×
U
L3
U
L3
3
DU> and the current change should be
Section 7
Testing functionality
(Equation 1)
= the measured phase voltages
3U2> is in percentage
M1405-72 v5
(Equation 4)
= the measured phase voltages.
3U0> is in percentage
M1405-96 v5
1 and 3.
49