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

Section 11
Testing functionality by secondary injection
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
11.9.2.3

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):
3 U
IEC00000276 V1 EN-US
Where:
IEC00000275 V1 EN-US
4. Compare the result with the set value of the zero-sequence operating voltage (consider
that the set value
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 operate current. Consider
that the set value
206
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 + U + U
0 L1 L2 L3
U , U and U
L1 L2 L3
are the measured phase voltages
3U0> is in percentage of the base voltage.)
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
3I0< is in percentage of the base current IBase .
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3
are the measured phase currents
3
2
3I2< is in percentage of the base current IBase .
are the measured phase currents
1MRK 504 165-UEN E
(Equation 108)
M1405-72 v11
(Equation 109)
(Equation 110)
Transformer protection RET670
Commissioning manual