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10.2.6
Monitored data
PID-3492-MONITOREDDATA v8
Table 186:
FUFSPVC Monitored data
Name
Type
Values (Range)
Unit
Description
3I0
REAL
-
A
Magnitude of zero
sequence current
3I2
REAL
-
A
Magnitude of negative
sequence current
3U0
REAL
-
kV
Magnitude of zero
sequence voltage
3U2
REAL
-
kV
Magnitude of negative
sequence voltage
10.2.7
Operation principle
10.2.7.1
Zero and negative sequence detection
M13677-3 v5
The zero and negative sequence function continuously measures the currents and
voltages in all three phases and calculates, see figure
•
the zero-sequence voltage 3U0
•
the zero-sequence current 3I0
•
the negative sequence current 3I2
•
the negative sequence voltage 3U2
The measured signals are compared with their respective set values
3U0>
and
3I0<
,
3U2>
and
3I2<
.
The function enable the internal signal FuseFailDetZeroSeq if the measured zero-
sequence voltage is higher than the set value
3U0>
and the measured zero-
sequence current is below the set value
3I0<
.
The function enable the internal signal FuseFailDetNegSeq if the measured
negative sequence voltage is higher than the set value
3U2>
and the measured
negative sequence current is below the set value
3I2<
.
A drop out delay of 100 ms for the measured zero-sequence and negative sequence
current will prevent a false fuse failure detection at un-equal breaker opening at the
two line ends.
Section 10
1MRK 506 382-UEN A
Secondary system supervision
322
Line distance protection REL650 2.2 IEC
Technical manual
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