Delta Current And Delta Voltage Detection - ABB REG650 Technical Manual

1MRK 502 048-UEN A
11.1.7.2
Technical manual
Sequence Detection
3I0<
IL1
Zero
sequence
filter
IL2
Negative
sequence
IL3
filter
3I2<
3U0>
UL1
Zero
sequence
filter
UL2
Negative
sequence
UL3
filter
3U2>
IEC10000036 V2 EN
Figure 157: Simplified logic diagram for sequence detection part
The calculated values 3U
HMI and monitoring tool in PCM600.

Delta current and delta voltage detection

A simplified diagram for the functionality is found in figure 158. 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 DI< and DU> 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 DU
• The change in current DI
The internal FuseFailDetDUDI signal is activated if the following conditions are
fulfilled for a phase:
• The magnitude of the phase-earth voltage has been above UPh> for more than 1.5
cycle
• The magnitude of DU is higher than the setting DU>
• The magnitude of DI is below the setting DI>
and at least one of the following conditions are fulfilled:
Secondary system supervision
100 ms
a
a>b
t
b
100 ms
a
a>b
t
b
a
a>b
b
a
a>b
b
, 3I , 3I and 3U are available as service values on local
0 0 2 2
Section 11
CurrZeroSeq
3I0
CurrNegSeq
3I2
FuseFailDetZeroSeq
AND
FuseFailDetNegSeq
AND
VoltZeroSeq
3U0
VoltNegSeq
3U2
IEC10000036-2-en.vsd
311