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Section 10
Testing functionality by secondary injection
108
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.
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.
1
11
X1
10
40% of RLdFw
80% of RLdFw
IEC05000368 V3 EN
Figure 24:
Distance protection characteristic with test points for phase-to-phase
measurements
Table 27:
Test points for phase-to-phase loops L1-L2 (Ohm/Loop)
Test point
Reach
Set value
1
X
X1
R
0
2
X
X1
R
R1
Table continues on next page
X
2
80%
3
50%
4
12
120°
a
5
6
R (Ohm/phase)
7
13
9
c
20°
8
0.5 x RFPP
IEC05000368-3-en
set
set
set
1MRK 506 355-UEN A
Comments
Line distance protection REL670 2.1 IEC
Commissioning manual
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