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1MRK 506 355-UEN A
10.4.5.1
Line distance protection REL670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
Test point
Reach
Value
4
X
R
5
X
R
6
X
R
7
X
R
8
X
R
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
20
and table 23. 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 above to find the operating value for the phase-to-earth fault
L3-E 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 5 measuring zones, it is only necessary to test
0.5 x (2 x X1
+ R0
)/3
set
set
0.5 x (2 x R1
+R0
)/3 + RFPE
set
set
0.85 x RFPE
x tan(ArgLdset)
set
0.85 x RFPE
RLdFwset x tan(ArgLdSet)
RLdFw
set
0
RLdFw
set
–02143 x RLdFw
set
0.8 x RLdFw
set
–0.8 x RLdFw
x tan(ArgDir)
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 table23.
21
and table 24.
Section 10
Comments
set
ArgLd = angle for the maximal load
transfer.
Exact: 0.8 x RFPE x tan (ArgDir)
Exact: 0.5 x (2 x X1
X0
set
Exact: 0.5 x (2X1
+ X0
set
tan(AgNegDir90)
Exact: 0.8 x (2 x X1
+ X0
set
Exact: 0.8 x (2X1set + X0set)/(3 x
tan(AngNegDir 90))
)/3
set
)/(3 x
set
)/3
set
103
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