When the load current compensation is inactive, the dotted lines and
test point 13 are valid. Test points 5, 6, and 7 are not valid for this
measurement.
X1
X
R (Ohm/phase)
50%
80%
1
2
3
4
5
6
7
8
9
10
11
80% of RLdFw
40% of RLdFw
0.5 x RFPP
12
13
120°
20°
a
c
IEC05000368-3-en
b
=
A
r
g
L
D
IEC05000368 V3 EN
Figure 20: Distance protection characteristic with test points for phase-to-phase
measurements
Table 23 is used in conjunction with figure 20.
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
=
A
r
g
L
D
alt. 80% of
RFPE (Load
encroachment)
120°
20°
a
IEC05000369-3-en.vsd
IEC05000369 V3 EN
Figure 21: Distance protection characteristic with test points for phase-to-earth
measurements
1MRK 506 355-UEN A Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC 101
Commissioning manual
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