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.
X1Zx
X
R (Ohm/phase)
50%
80%
1
2
3
4
5
6
7
8
9
10
11
80% of RLdFw
40% of RLdFw
12
13
120°
20°
a
c
IEC05000368-4-en.vsdx
0.5 x RFPPZx
IEC05000368 V4 EN-US
Figure 35: Distance protection characteristic with test points for phase-to-
phase measurements
Table 32: 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
+ RFPPZx/2
4 X 0.5 x X1
set
R 0.5 x R1
set
+ RFPPZx/2
5 X 0.85 x RFPPZx x tan (ArgLd)
ArgLd
= angle for the maximal load
transfer
R 0.85 x RFPPZx
Table continues on next page
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 137
Commissioning manual
To Next Page
Loading...
