
Functions
2.8 Monitoring Functions
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
138
For applications in which an opposite phase sequence is expected, the protective relay should be adjusted via
a binary input or the respective parameter
PHASE SEQ.
(address
209
). If the phase sequence is changed in
the device, phases B and C internal to the relay are reversed, and the positive and negative sequence currents
are thereby exchanged (see also Section 2.15.2). The phase-related messages, malfunction values, and mea-
sured values are not affected by this.
2.8.1.5
Setting Notes
Measured Value Monitoring
The sensitivity of measured value monitor can be modified. Default values are set at the factory, which are suf-
ficient in most cases. If an extremely high operational unbalance of the currents is to be expected in the specific
application, or if during operation monitoring functions are operated sporadically, the relevant parameters
should be set less sensitive.
Address
8104
BALANCE I LIMIT
determines the limit current, above which the current symmetry monitor is
effective. Address
8105
BAL. FACTOR I
is the associated symmetry factor; that is, the slope of the symmetry
characteristic curve.
Address
8106
Σ
I THRESHOLD
determines the limit current, above which the current sum monitor is activated
(absolute portion, only relative to
I
Nom
). The relative portion (relative to the maximum conductor current) for ac-
tivating the current sum monitor is set at address
8107
Σ
I FACTOR
.
Note
Current sum monitoring can operate properly only when the residual current of the protected line is fed to the
fourth current input (
I
N
) of the relay (see
Power System Data 1
). Furthermore, the fourth current input (
I
N
)
may not be sensitive.
Note
The connections of the ground paths and their adaption factors were set when configuring the general Power
System Data. These settings must be correct for the measured values monitoring to function properly.
Measured value monitoring can be turned
ON
or
OFF
at address
8101
MEASURE. SUPERV
.
Содержание SIPROTEC 7SJ61
Страница 368: ...Technical Data 4 22 Dimensions SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 368 ...
Страница 436: ...Appendix A 11 Measured Values SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 436 ...
Страница 438: ...Literature SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 438 ...
Страница 450: ...Glossary SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 450 ...
Страница 454: ...Index SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 454 ...