ABB REL670 Installation And Commissioning Manual page 92

Test point
1
2
3
4
5
6
7
8
84
Distance protection
11
X1+XN
10
40% of RLdFw
80% of RLdFw
alt. 80% of
RFPE (Load
encroachment)
Figure 27: Distance protection (ZM) characteristic with test points for phase to earth mea-
surements
Table 16 is used in conjunction with
Table 15: Test points for phase-to-phase loops L1-L2 (Ohm/Loop)
Reach Set value
X X1
set
R 0
X X1
set
R R1
set
X 0.8 x X1
set
R 0.8 x R1 + RFPP/2
set
X 0.5 x X1
set
R 0.5 x R1 + RFPP/2
set
X 0.85 x RFPP x tan (ArgRLd)
R 0.85 x RFPP
X RLdFw x tan (ArgLd)
R RLdFw
X RLdFw x tan (ArgLd)
R 0
X –0.2143 x RFPP/2
R 0.8 x RFPP/2
X
2
1
80%
3
50%
4
12
5
6
7 13
9
8
RFPE
en05000369.vsd
figure 27.
Comments
ArgRLd = angle for the maximal load transfer
Exact: 0.8 x RFPP/2 (ArgDir)
Verifying settings by secondary
(Ω / loop)
R
Chapter 11
injection