ABB RET670 - Page 139

X1
R
X
(O/phase)
50%
80%
1
2
3
4
5
6
7
8
9
10
11
80% of RLdFwd
40% of RLdFwd
0.5 x RFPP
12
ANSI05000368-1-en.vsd
13
b
120°
20°
a
c
ANSI05000368 V1 EN
Figure 33: Distance protection characteristic with test points for phase-to-phase
measurements
Table 28: Test points for phase-to-phase loops A-B (Ohm/Loop)
Test point
Reach Set value Comments
1 X X1
set
R 0
2 X X1
set
R R1
set
3 X 0.8 x X1
set
R 0.8 x R1
set
+ RFPPZx/2
4 X 0.5 x X1
set
R 0.5 x R1
set
+ RFPPZx/2
5 X 0.85 x RFPPZx x tan (LdAngle) LdAngle = angle for the maximal load
transfer
R 0.85 x RFPPZx
6 X RLdFwd x tan (LdAngle)
R RLdFwd
7 X 0
R RLdFw
8 X –0.2143 x RFPPZx/2 Exact: 0.8 x RFPPZx/2 (ArgDir=20°)
R 0.8 x RFPPZx/2
Table continues on next page
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 133
Commissioning manual