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1MRK 504 165-UEN Rev. K
Test point
7
8
9
10
11
12
13
11.4.1.1
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
Compare the result of the measurement with the set value.
3.
Repeat steps 1 to 2 to find the operating value for test points 2, 3 in table 20.
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 1 to 3 to find the operating value for the phase-to-earth fault L3–E according to
figure
11.4.1.2
Measuring the operating time of distance protection zones
Procedure:
1.
Subject the IED to healthy normal load conditions for at least two seconds.
2.
Apply the fault condition to find the operating time for the phase-to-phase fault according to test
point 12 in figure
setting t1PP.
3.
Repeat steps 1 to 2 to find the operating time for the phase-to-earth fault according to test point
12 in figure
4.
Repeat steps 1 to 3 to find the operating time for all other used measuring zones.
Transformer protection RET670
Commissioning manual
Reach
Value
X
0
R
RLdFw
set
X
–0.1072 x RLdFw
R
0.4 x RLdFw
set
X
–0.8 x RLdFw
set
R
0.8 x RLdFw
set
X
0.17 x (2 x X1
set
R
-0.36 x (2 x X1
X
0.27 x (2 x X1
set
R
–0.57 x (2 x X1
X
0.5 x (2 x X1
set
R
0.5 x (2 x R1
set
X
0
R
RFPE
26
and table 21.
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 5 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).
25
and table
20
26
and table 21. Compare the result of the measurement with the setting t1PE.
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Comments
Exact: 0.4 x RFPE x tan (ArgDir=20°)
set
x tan(ArgDir=20°)
+ X0
)
Exact: 0.5 x (2 x X1
set
+ X0
)
Exact: 0.5 x (2X1
set
set
+X0
)
Exact: 0.8 x (2 x X1
set
+ X0
)
Exact: 0.8 x (2X1set + X0set)/(3 x
set
set
tan(AgNegDir=30°)
+ X0
)/3
set
+ R0
)/3
set
Only used when RLdFw > RFPE
for zone 1. Compare the result of the measurement with the
Section 11
Testing functionality by secondary injection
X0
)/3
set
set
+ X0
)/(3 x tan(AgNegDir=30°)
set
set
+ X0
)/3
set
set
25
and table 20.
M14944-126 v8
M14944-154 v6
105
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