IL1
IL2
IL3
Zero
sequence
filter
Negative
sequence
filter
UL1
UL2
UL3
Zero
sequence
filter
Negative
sequence
filter
CurrZeroSeq
CurrNegSeq
a
b
a>b
a
b
a>b
a
b
a>b
a
b
a>b
3I2<
t
100 ms
t
100 ms
VoltZeroSeq
VoltNegSeq
AND
AND
FuseFailDetZeroSeq
FuseFailDetNegSeq
Sequence Detection
3U0>
3U2>
3I0
3I2
3U0
3U2
IEC10000036-2-en.vsd
3I0<
IEC10000036 V2 EN
Figure 157:
Simplified logic diagram for sequence detection part
The calculated values 3U
0
, 3I
0
, 3I
2
and 3U
2
are available as service values on local
HMI and monitoring tool in PCM600.
11.1.7.2
Delta current and delta voltage detection
A simplified diagram for the functionality is found in figure
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:
1MRK 502 048-UEN A
Section 11
Secondary system supervision
311
Technical manual
Summary of Contents for REG650 ANSI
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