ABB RET670 Commissioning Manual page 131

1MRK 504 165-UUS -
Transformer protection RET670 2.2 ANSI
Commissioning manual
1
11
X1
10
40% of RLdFwd
80% of RLdFwd
ANSI05000368 V1 EN
Figure 29: Distance protection characteristic with test points for phase-to-phase
measurements
Table 24 is used in conjunction with figure 29.
1
11
10
40% of RLdFwd
80% of RLdFwd
alt. 80% of
RFPG (Load
encroachment)
ANSI05000369 V2 EN
Figure 30: Distance protection characteristic with test points for phase-to-ground
measurements
Table 25 is used in conjunction with figure 30.
Testing functionality by secondary injection
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
2
80%
3
50%
4
12
5
120°
a
6
7 13
9
20°
8
RFPG
ANSI05000369-2-en.vsd
Section 11
(O/phase)
125