Measuring The Trip Value For The Zero-Sequence Function - ABB REG670 Commissioning Manual

1MRK 502 073-UUS A
13.9.2.3
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
2
× = + ×
3 V V a V
2 A B
EQUATION1818-ANSI V1 EN-US
Where:
V V V
and
A B C
EQUATION1820-ANSI V1 EN-US
p ×
2
j
= × = -
a 1 e 0, 5
3
IECEQUATION00022 V2 EN-US
4. Compare the result with the set value of the negative-sequence operating voltage
(consider that the set value 3V2PU is in percentage of the base voltage VBase).
5. Repeat steps 1 and 2. Then slowly increase the measured current in one phase
until the BLKV 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 × + ×
3 I I a I
2
A B
ANSIEQUATION00021 V1 EN-US
Where:
,
I I and I
A B C
ANSIEQUATION00020 V1 EN-US
p ×
2
j
= × = -
a 1 e 0, 5
3
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.

Measuring the trip value for the zero-sequence function

Measure the trip value for the zero-sequence function, if included in the IED.
Testing functionality by secondary injection
+ ×
a V
C
are the measured phase voltages
3
+
. j
2
a I
C
are the measured phase currents
3
+
. j
2
Section 13
(Equation 107)
(Equation 108)
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