ABB RED670 Commissioning Manual page 109

1MRK 505 378-UUS Rev. J
Table 21:
Test point
1
2
3
4
5
6
7
8
9
10
11
12
13
Table 21
Line differential protection RED670
Commissioning manual
Test points for phase-to-phase loops L1-L2 (Ohm/Loop)
Reach Set value
X X1
set
R 0
X X1
set
R R1
set
X 0.8 x X1
set
R 0.8 x R1 + RFPP/2
set
X 0.5 x X1
set
R 0.5 x R1 + RFPP/2
set
X 0.85 x RFPP x tan (ArgRLd)
R 0.85 x RFPP
X RLdFw x tan (ArgLd)
R RLdFw
X 0
R RLdFw
X –0.2143 x RFPP/2
R 0.8 x RFPP/2
X –0.4 x RLdFw x tan(ArgDir=20°)
R 0.4 x RLdFw
X 0.5 x X1
set
R –0.23 x X1
set
X 0.8 x X1
set
R –0.37 x X1
set
X 0.5 x X1
set
R 0.5 x R1
set
X 0
R 0.5 x RFPP
is used in conjunction with figure 23.
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Testing functionality by secondary injection
Comments
ArgLd = angle for the maximal load transfer
Exact: 0.8 x RFPP/2 (ArgDir=20°)
Exact –0.5 x R1 x tan(ArgNegRes=30°)
set
Exact –0.5 x R1 x tan(ArgNegRes=30°)
set
Only used when RLdFw > 0.5 x RFPP
Section 11
103