ABB REG670 - Measuring the Trip Value for the Zero-Sequence Function

2
2
3
A B C
V V a V a V× = + × + ×
EQUATION1818-ANSI V1 EN-US (Equation 107)
Where:
A B C
andV V V
EQUATION1820-ANSI 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 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
2
3
A B C
I I a I a I× = + × + ×
ANSIEQUATION00021 V1 EN-US (Equation 108)
Where:
A B C
I I and I ,
ANSIEQUATION00020 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.
13.9.2.3 Measuring the trip value for the zero-sequence function
M1405-72 v11
Measure the trip value for the zero-sequence function, if included in the IED.
1MRK 502 073-UUS A Section 13
Testing functionality by secondary injection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 243
Commissioning manual