Measuring The Operating Limit Of Set Values - ABB Relion 670 Series Commissioning Manual
Transformer protection
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1MRK 504 165-UUS Rev. J
Test point
4
5
6
7
8
9
10
11
12
13
11.4.8.3
Measuring the operating limit of set values
Procedure:
1.
Subject the IED to healthy normal load conditions for at least two seconds.
2.
Apply the fault condition and slowly decrease the measured impedance to find the operating value
of the phase-to-phase fault for zone 1 according to test point 1 in figure and table . Compare the
result of the measurement with the set value.
3.
Repeat steps
Observe that the zones that are not tested have to be blocked and the zone that is tested has to be
released.
4.
Repeat steps
and table .
Transformer protection RET670
Commissioning manual
Reach
Value
X
0.5 x (2 x X1
+ R0
set
R
0.5 x (2 x R1
+R0
set
RFPGZx
set
X
0.85 x RFPGZx
set
tan(LdAngle
)
set
R
0.85 x RFPGZx
X
RLdFwdset x tan(LdAngleSet)
R
RLdFwd
set
X
0
R
RLdFwd
set
X
–02143 x RLdFwd
R
0.8 x RLdFwd
set
X
–0.8 x RLdFwd
set
tan(ArgDir=20°)
R
0.8 x RLdFwd
set
X
0.17 x (2 x X1
+ X0
set
R
-0.36 x (2 x X1
+ X0
set
X
0.27 x (2 x X1
+X0
set
R
–0.57 x (2 x X1
set
X
0.5 x (2 x X1
+ X0
set
R
0.5 x (2 x R1
+ R0
set
X
0
R
1
to
2
to find the operating value for test points 2, 3 in table .
1
to
3
to find the operating value for the phase-to-ground fault C-G according to figure
Test points 8, 9, 10 and 11 are intended to test the directional lines of impedance
protection. Since directionality is a common function for all seven measuring
zones, it is only necessary to test points 8, 9, 10 and 11 once, in the forward
direction in order to test the accuracy of directionality (directional angles).
Directional functionality testing (trip inside, no-trip outside) should always be made
for all impedance zones set with directionality (forward or reverse).
© 2017 - 2021 Hitachi Power Grids. All rights reserved
Comments
)/3
set
)/3 +
set
x
LdAngle = angle for the maximal load transfer
Exact: 0.8 x RFPGZx x tan (ArgDir=20°)
set
x
)
Exact: 0.5 x (2 x X1
set
)
Exact: 0.5 x (2X1
set
)
Exact: 0.8 x (2 x X1
set
+ X0
)
Exact: 0.8 x (2X1
set
)/3
set
)/3
set
Testing functionality by secondary injection
X0
)/3
set
set
+ X0
)/(3 x tan(AgNegDir=30°)
set
set
+ X0
)/3
set
set
+ X0
)/(3 x tan(AgNegDir=30°)
set
set
GUID-24FEBCE7-3409-4204-AA15-A1E0A1605866 v4
Section 11
131
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