ABB RELION 670 Series Technical Manual page 744

Section 13
Secondary system supervision
DeltaIA
DeltaIB
DeltaIC
DeltaVA
DeltaVB
DeltaVC
ANSI12000165 V2 EN-US
Figure 393: Internal signals DeltaV or DeltaI and the corresponding output signals
13.2.7.3 Dead line detection
A simplified diagram for the functionality is found in figure 394. A dead phase condition is
indicated if both the voltage and the current in one phase is below their respective setting values
VDLDPU and IDLDPU . 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
738
0
20 ms
0
20 ms
0
20 ms
0
20 ms
0
20 ms
0
20 ms
intBlock
PU_DI
AND
AND
PU_DI_A
OR
PU_DI_B
AND
PU_DI_C
AND
PU_DV
AND
PU_DV_A
AND
OR OR
PU_DV_B
AND
PU_DV_B
AND
ANSI12000165-2-en.vsd
1MRK 502 066-UUS B
M13679-44 v4
Technical manual