ABB RED670 Commissioning Manual page 108

Section 11
Testing functionality by secondary injection
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 the set minimum operating
current.
Ensure that the maximum continuous current to the 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
and 22. In cases where the load encroachment characteristic is 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.
X1set
ANSI05000368 V2 EN-US
Figure 23:
102
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
10
12
9
8
25% of RFPPZx/2
50% of RFPPZx/2
RFPP/2
Distance protection characteristic with test points for phase-to-phase measurements
© 2017 - 2021 Hitachi Power Grids. All rights reserved
3
50%
4
5
ArgLd
6
(Ω/phase)
R
7 13
ArgDir
ANSI05000368-2-en.vsdx
1MRK 505 378-UUS Rev. J
23 and 24 and tables
Line differential protection RED670
Commissioning manual
21