X1+XN
X
R (Ohm/loop)
50%
80%
1
2
3
4
5
6
7
8
9
10
11
80% of RLdFw
40% of RLdFw
RFPE
12
13
c
b =
Ar
gLD
alt. 80% of
RFPE (Load
encroachment)
120°
20°
a
IEC05000369-3-en.vsd
IEC05000369 V3 EN
Figure 25:
Distance protection characteristic with test points for phase-to-earth
measurements
Table
is used in conjunction with figure
Table 28:
Test points for phase-to-earth L3-E (Ohm/Loop)
Test point
Reach
Value
Comments
1
X
(2 x X1
set
+X0
set
)/3
R
0
2
X
(2 x X1
set
+ X0
set
)/3
R
2 x R1
set
+ R0
set
)/3
3
X
0.8 x (2 x X1
set
+ X0
set
)/3
R
0.8 x (2 x R1
set
+ R0
set
)/3 +RFPE
set
4
X
0.5 x (2 x X1
set
+ R0
set
)/3
R
0.5 x (2 x R1
set
+R0
set
)/3 + RFPE
set
5
X
0.85 x RFPE
set
x tan(ArgLdset)
ArgLd = angle for the maximal load
transfer
R
0.85 x RFPE
6
X
RLdFwset x tan(ArgLdSet)
R
RLdFw
set
7
X
0
R
RLdFw
set
8
X
–02143 x RLdFw
set
Exact: 0.8 x RFPE x tan (ArgDir=20°)
R
0.8 x RLdFw
set
Table continues on next page
Section 10
1MRK 506 355-UEN A
Testing functionality by secondary injection
110
Line distance protection REL670 2.1 IEC
Commissioning manual
Summary of Contents for Relion 670 Series REL670
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