ABB RET670 Commissioning Manual page 137

1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
11
X1Zx+XNZx
10
40% of RLdFw
80% of RLdFw
alt. 80% of
RFPEZx (Load
encroachment)
IEC05000369 V4 EN-US
Figure 34: Distance protection characteristic with test points for phase-to-
earth measurements
Table 31 is used in conjunction with figure 34.
Table 31: Test points for phase-to-earth L3-E (Ohm/Loop)
Test point Reach Value
1 X
R
2 X
R
3 X
R
4 X
R
5 X
R
6 X
R
7 X
R
8 X
R
Table continues on next page
X
2
1
80%
3
50%
4
12
5
120°
a
6
7 13
9
20°
8
RFPEZx
IEC05000369-4-en.vsdx
(2 x X1 +X0 )/3
set set
0
(2 x X1 + X0 )/3
set set
2 x R1 + R0 )/3
set set
0.8 x (2 x X1 + X0 )/3
set set
0.8 x (2 x R1 + R0 )/3
set set
+RFPEZx
set
0.5 x (2 x X1 + R0 )/3
set set
0.5 x (2 x R1 +R0 )/3 +
set set
RFPEZx
set
0.85 x RFPEZx x tan(ArgLdset)
set
0.85 x RFPEZx
RLdFwset x tan(ArgLdSet)
RLdFw
set
0
RLdFw
set
–02143 x RLdFw
set
0.8 x RLdFw
set
Section 11
R (Ohm/loop)
Comments
ArgLd = angle for the maximal load
transfer
Exact: 0.8 x RFPEZx x tan
(ArgDir=20°)
131