Operating instructions
7SV512
V1
81
C53000---G1176---C91
6.3.6 Settings for measured value monitoring --- address block 29
The different monitoring functions of the protective
relay are described in Section 4.5.4. They partly
monitor the relay itself and partly the steady-state
measured values of the transformer circuits.
The sensitivity of the measured value monitoring can
be changed in block 29. The factory settings are
suitable in most cases. If particularly high operation-
al asymmetries of the currents are expected, or if,
during operation, one or more monitoring functions
reacts sporadically, then sensitivity should be re-
duced.
NOTE
: Prerequisite for correct functioning of the
measured value monitors is the proper setting of the
general power system data (Section 6.3.3), espe-
cially the parameters concerning earth current
matching.
2 9 0 0
M E A S . V A L U E
S U P E R V I S I O N
Beginning of block ”Measured value supervision”
2 9 0 3
S Y M . I t h r e s
0 . 5 0
I / I n
Current threshold above which the symmetry moni-
toring is effective (refer to Figure 4.21)
Smallest setting value:
0.10
¡
I
N
Largest setting value:
1.00
¡
I
N
2 9 0 4
S Y M . F a c t . I
0 . 5 0
Symmetry factor for the current symmetry = slope of
the symmetry characteristic (see Figure 4.21)
Smallest setting value:
0.10
Largest setting value:
0.95
2 9 0 5
S U M . I t h r e s
0 . 1 0
I / I n
Current threshold above which the summation moni-
toring (refer to Figure 4.20) reacts (absolute content,
referred to I
N
only)
Smallest setting value:
0.05
¡
I
N
Largest setting value:
2.00
¡
I
N
2 9 0 6
S U M . F a c t . I
0 . 1 0
Relative content (related to the maximum conductor
current) for operation of the current summation mon-
itoring (refer Figure 4.20)
Smallest setting value:
0.00
Largest setting value:
0.95
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