ABB REB650 - Delta Current and Delta Voltage Detection

IA
IB
IC
Zero
sequence
filter
Negative
sequence
filter
VA
VB
VC
Zero
sequence
filter
Negative
sequence
filter
CurrZeroSeq
CurrNegSeq
a
b
a>b
a
b
a>b
a
b
a>b
a
b
a>b
3I0PU
3I2PU
VoltZeroSeq
VoltNegSeq
AND
AND
FuseFailDetZeroSeq
FuseFailDetNegSeq
Sequence Detection
3V0PU
3V2PU
3I0
3I2
3V0
3V2
ANSI10000036-2-en.vsd
0
100 ms
0
100 ms
ANSI10000036 V2 EN
Figure 58: Simplified logic diagram for sequence detection part
The calculated values 3V
0
, 3I
0
, 3I
2
and 3V
2
are available as service values on local
HMI and monitoring tool in PCM600.
9.1.7.2 Delta current and delta voltage detection
A simplified diagram for the functionality is found in figure
59. The calculation of the
change is based on vector change which means that it detects both amplitude and phase
angle changes. The calculated delta quantities are compared with their respective set
values DIPU and DVPU and the algorithm, detects a fuse failure if a sufficient change
in voltage without a sufficient change in current is detected in each phase separately.
The following quantities are calculated in all three phases:
• The change in voltage DV
• The change in current DI
The internal FuseFailDetDVDI signal is activated if the following conditions are
fulfilled for a phase:
1MRK 505 277-UUS C Section 9
Secondary system supervision
149
Technical Manual