ABB RET670 Commissioning Manual page 99

1MRK 504 154-UUS B
Measure operating characteristics during constant current conditions. Keep the measured current
as close as possible to its rated value or lower. But make sure it is higher than 30% of the rated
current.
Ensure that the maximum continuous current in an IED does not exceed four times its rated value,
if the measurement of the operating characteristics runs under constant voltage conditions.
The test procedure has to take into consideration that the shaped load encroachment
characteristic is active. It is therefore necessary to check the setting. To verify the settings with
the shaped load encroachment characteristic the test should be carried out according to
figures 20
activated tests according to the adjusted figures should be carried out.
To verify the settings for the operating points according to the following fault types should be
tested:
• 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 20: Distance protection characteristic with test points for phase-to-phase
Table 23
Commissioning manual
and 21 and tables 23 and 24. In cases where the load encroachment characteristic is
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.
Test points 5, 6, and 7 are not valid for this measurement.
X
2
1
80%
11
50%
10
12
120°
a
9
8
0.5 x RFPP
measurements
is used in conjunction with figure 20.
3
4
5
6
(O/phase)
R
7 13
c
20°
ANSI05000368-1-en.vsd
Testing functionality by secondary injection
Section 10
93