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.
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.
X1set
R
X
(Ω/phase)
50%
80%
1
2
3
4
5
6
7
8
9
10
11
50% of RFPPZx/2
25% of RFPPZx/2
RFPP/2
12
ANSI05000368-2-en.vsdx
13
ArgDir
ArgLd
ANSI05000368 V2 EN-US
Figure 25: Distance protection characteristic with test points for phase-to-phase measurements
Table 20: Test points for phase-to-phase loops L1-L2 (Ohm/Loop)
Test point
Reach Set value Comments
1 X X1
set
R 0
2 X X1
set
R R1
set
3 X 0.8 x X1
set
R 0.8 x R1
set
+ RFPP/2
4 X 0.5 x X1
set
R 0.5 x R1
set
+ RFPP/2
Table continues on next page
1MRK 504 165-UUS Rev. J Section 11
Testing functionality by secondary injection
Transformer protection RET670 107
Commissioning manual
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