Dead Line Detection - ABB REL650 Technical Manual
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1MRK 506 382-UEN A
10.2.7.3
Line distance protection REL650 2.2 IEC
Technical manual
20 ms
20 ms
DeltaIL1
t
t
20 ms
20 ms
DeltaIL2
t
t
20 ms
20 ms
DeltaIL3
t
t
20 ms
DeltaUL1
t
20 ms
DeltaUL2
t
20 ms
DeltaUL3
t
IEC12000165 V1 EN-US
Figure 163:
Internal signals DeltaU or DeltaI and the corresponding output
signals
Dead line detection
A simplified diagram for the functionality is found in figure 164. A dead phase
condition is indicated if both the voltage and the current in one phase is below their
respective setting values UDLD< and IDLD<. If at least one phase is considered to
be dead the output DLD1PH and the internal signal DeadLineDet1Ph is activated.
If all three phases are considered to be dead the output DLD3PH is activated
Secondary system supervision
intBlock
AND
STDIL1
AND
OR
STDIL2
AND
STDIL3
AND
STDU
AND
STDUL1
AND
OR
OR
STDUL2
AND
STDUL3
AND
IEC12000165-1-en.vsd
Section 10
STDI
M13679-44 v4
327
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