ABB RET670 Commissioning Manual page 111

1MRK 504 154-UUS B
• One phase-to-phase fault
• One phase-to-ground fault
The shape of the operating characteristic depends on the values of the setting parameters.
X1
40% of RLdFwd
80% of RLdFwd
ANSI05000368 V1 EN-US
Figure 26: Distance protection characteristic with test points for phase-to-phase
Table 29: Test points for phase-to-phase loops A-B (Ohm/Loop)
Test point
1
2
3
4
Table continues on next page
Commissioning manual
The figures illustrating the characteristic for the distance protection function can
be used for settings with and without load encroachment. The solid lines designate
the diagram applicable when the load current compensation is active. The solid line
and all test points except 13 are valid for this case.
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.
X
2
1
80%
11
50%
10
12
120°
a
6
7
9
8
0.5 x RFPP
measurements
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
3
4
5
(O/phase)
R
13
c
20°
ANSI05000368-1-en.vsd
Comments
Testing functionality by secondary injection
Section 10
105