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1MRK 506 355-UEN A
10.4.7.1
10.4.7.2
Line distance protection REL670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
Test point
Reach
Value
9
X
R
10
X
R
11
X
R
12
X
R
13
X
R
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
24
and table 27. Compare the result of the measurement with the set
value.
3.
Repeat steps
1
to
2
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
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 six measuring zones, it is only necessary to test
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).
Measuring the operating time of distance protection zones
Procedure:
–0.8 x RLdFw
x tan(ArgDir=20°)
set
–0.8 x RLdFwd
x tan(ArgDir=20°)
set
0.8 x RLdFw
set
0.17 x (2 x X1
+ X0
)
set
set
-0.36 x (2 x X1
+ X0
)
set
set
0.27 x (2 x X1
+X0
)
set
set
–0.57 x (2 x X1
+ X0
)
set
set
0.5 x (2 x X1
+ X0
)/3
set
set
0.5 x (2 x R1
+ R0
)/3
set
set
0
RFPE
to find the operating value for test points 2, 3 in table
to find the operating value for the phase-to-earth fault L3-E
25
and table 28.
Section 10
Comments
Exact: 0.5 x (2 x X1
X0
)/3
set
set
Exact: 0.5 x (2X1
+ X0
)/(3 x
set
set
tan(AgNegDir=30°)
Exact: 0.8 x (2 x X1
+ X0
set
set
Exact: 0.8 x (2X1set + X0set)/(3 x
tan(AgNegDir=30°)
)/3
27
111
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