Operating instructions7SV512
V1
81C53000---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.
Thesensitivity ofthemeasured valuemonitoringcan
be changed in block 29. The factory settings are
suitable in most cases. Ifparticularly 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 ofthe
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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