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Section 11
Testing functionality by secondary injection
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
27
and 28. 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-earth fault
The shape of the operating characteristic depends on the values of the setting parameters.
X1set
IEC05000368 V5 EN-US
Figure 29:
Table
27
108
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
R1set
2
1
11
10
12
9
8
25% of RFPPZx/2
50% of RFPPZx/2
RFPPZx/2
Distance protection characteristic with test points for phase-to-phase
measurements
is used in conjunction with figure 29.
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80%
3
50%
4
5
6
R (Ohm/phase)
7
13
ArgDir
IEC05000368-5-en.vsdx
1MRK 505 378-UEN Rev. K
29
and
30
and tables
Line differential protection RED670
Commissioning manual
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