ABB RET670 Commissioning Manual page 120

Section 11
Testing functionality by secondary injection
114
1
11
X1
10
40% of RLdFwd
80% of RLdFwd
ANSI05000368 V1 EN
Figure 23: Distance protection characteristic with test points for phase-to-phase
measurements
Table 18: Test points for phase-to-phase loops L1-L2 (Ohm/Loop)
Test point Reach Set value
1 X X1
R 0
2 X X1
R R1
3 X 0.8 x X1
R 0.8 x R1
4 X 0.5 x X1
R 0.5 x R1
5 X 0.85 x RFPP x tan (ArgRLd)
R 0.85 x RFPP
6 X RLdFw x tan (ArgLd)
R RLdFw
7 X 0
R RLdFw
8 X –0.2143 x RFPP/2
R 0.8 x RFPP/2
Table continues on next page
X
2
80%
3
50%
4
12
120°
a
5
6
R
7 13
9
c 20°
8
0.5 x RFPP
ANSI05000368-1-en.vsd
set
set
set
set
+ RFPP/2
set
set
+ RFPP/2
set
1MRK 504 165-UUS -
(O/phase)
Comments
ArgLd = angle for the maximal load
transfer
Exact: 0.8 x RFPP/2 (ArgDir=20°)
Transformer protection RET670 2.2 ANSI
Commissioning manual