ABB RET670 Commissioning Manual page 129

1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
Table 26: 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
3 X 0.8 x X1
R 0.8 x R1
4 X 0.5 x X1
R 0.5 x R1
5 X 0.85 x RFPP x tan (ArgRLd)
R 0.85 x RFPP
6 X RLdFw x tan (ArgLd)
R RLdFw
7 X RLdFw x tan (ArgLd)
R 0
8 X –0.2143 x RFPP/2
R 0.8 x RFPP/2
9 X –0.4 x RLdFw x tan(ArgDir)
R 0.4 x RLdFw
10 X 0.5 x X1
R –0.23 x X1
11 X 0.8 x X1
R –0.37 x X1
12 X 0.5 x X1
R 0.5 x R1
13 X 0
R 0.5 x RFPP
Table 27: Test points for phase-to-earth L3-E (Ohm/Loop)
Test point Reach Value
1 X
R
2 X
R
3 X
R
Table continues on next page
set
set
set
set
+ RFPP/2
set
set
+ RFPP/2
set
set
set
set
set
set
set
(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
+RFPE
set
Section 11
Comments
ArgRLd = angle for the maximal
load transfer
Exact: 0.8 x RFPP/2 (ArgDir)
Exact –0.5 x R1 x
set
tan(ArgNegRes-90)
Exact –0.5 x R1 x
set
tan(ArgNegRes-90)
OperationLdCmp
Only used when
setting is 0 (Off)
Comments
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