Measuring The Operate Value For The Zero-Sequence Function; Checking The Operation Of The Du/Dt And Di/Dt Based Function - ABB REQ650 1.3 IEC Commissioning Manual

Section 7
Testing functionality
3
IECEQUATION00021 V1 EN-US
Where:
I
IECEQUATION00020 V1 EN-US
a
IECEQUATION00022 V1 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.
7.6.2.3

Measuring 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.
5. Repeat steps
BLKU signal disappears.
6. Record the measured current and calculate the corresponding zero-sequence current
according to the equation.
Observe that the currents in the equation are phasors.
3
IECEQUATION00019 V1 EN-US
Where:
I
IECEQUATION00020 V1 EN-US
7. Compare the result with the set value of the zero-sequence operating current. Consider
that the set value 3I0< is in percentage of the base current IBase.
7.6.2.4

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

76
× = + 2 × + ×
I I a I a I
2
L 1 L 2 L
,
I and I
L 1 L 2 L 3
p ×
2
3
j
= × = - +
1 e 0, 5 j
3
2
×
= U + U + U
0 L1 L2 L3
U , U and U
L1 L2 L3
1 and 2. Then slowly increase the measured current in one phase until the
× + +
I = I I I
0 L1 L2 L3
,
I and I
L 1 L 2 L 3
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3
= the measured phase currents
= the measured phase currents
1MRK 505 293-UEN B
(Equation 25)
M1405-72 v7
(Equation 28)
= the measured phase voltages
3U0> is in percentage
(Equation 30)
M1405-96 v8
Breaker protection REQ650
Commissioning manual