Setting Notes - Siemens siprotec SJ62 User Manual

2 Functions

2.11.1.6 Setting Notes

General
Measured Value
Monitoring
191
Measured value monitoring can be turned ON or OFF at address 8101 MEASURE.
SUPERV.
The fuse–failure monitor can be set ON or OFF at address 5301 FUSE FAIL MON..
Note
On systems where the ground fault current is very small or absent (e.g. ungrounded
supply transformers), fuse failure monitoring must not be used!
The sensitivity of the measured value monitor can be modified. Default values which
are sufficient in most cases are preset. If especially high operating asymmetry in the
currents and/or voltages are to be expected during operation, or if it becomes apparent
during operation that certain monitoring functions activate sporadically, then the
setting should be less sensitive.
Address 8102 BALANCE V-LIMIT determines the limit voltage (phase-to-phase),
above which the voltage symmetry monitor is effective. Address 8103 BAL. FACTOR
V is the associated symmetry factor; that is, the slope of the symmetry characteristic
curve.
Address 8104 BALANCE I LIMIT determines the limit current, above which the
current symmetry monitor is effective. Address 8105 BAL. FACTOR I is the associ-
ated 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
ative to the maximum conductor current) for activating 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
Note
The connections of the ground paths and their adaption factors were set when config-
uring the general station data. These settings must be correct for the measured value
monitoring to function properly.
). The relative portion (rel-
N
) of the relay.
N
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015