Delta Current And Delta Voltage Detection - ABB REL650 series Technical Manual

1MRK 506 335-UUS A
10.2.7.2
Technical manual
Sequence Detection
3I0PU
IA
Zero
sequence
filter
IB
Negative
sequence
IC
filter
3I2PU
3V0PU
VA
Zero
sequence
filter
VB
Negative
sequence
VC
filter
3V2PU
ANSI10000036 V2 EN
Figure 158: Simplified logic diagram for sequence detection part
The calculated values 3V
and monitoring tool in PCM600.

Delta current and delta voltage detection

A simplified diagram for the functionality is found in figure 159. 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:
Secondary system supervision
a
a>b 100 ms
b
0
a
a>b 100 ms
b
0
a
a>b
b
a
a>b
b
, 3I , 3I and 3V are available as service values on local HMI
0 0 2 2
Section 10
CurrZeroSeq
CurrNegSeq
FuseFailDetZeroSeq
AND
FuseFailDetNegSeq
AND
VoltZeroSeq
VoltNegSeq
ANSI10000036-2-en.vsd
3I0
3I2
3V0
3V2
337