Address 8106
Σ I THRESHOLD
determines the limit current above which the current sum monitoring is acti-
vated (absolute portion, only relative to
Ι
Nom
). The relative portion (relative to the maximum conductor
current) for activating the current sum monitor is set at address 8107
Σ I FACTOR
.
i
i
NOTE
Current sum monitoring can operate properly only when the residual current of the protected line is fed to
the fourth current input (
Ι
N
) of the relay (see Power System Data 1). Furthermore, the fourth current input
(
Ι
N
) may not be sensitive.
i
i
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 prop-
erly.
Measured value monitoring can be set to
ON
or
OFF
at address 8101
MEASURE. SUPERV
.
Fuse Failure Monitor (FFM)
Via address 5301
FUSE FAIL MON.
you select under which system conditions the FFM works. Depending on
that, make the required settings in the grounded system via the parameters 5302, 5303 and 5308. In a
grounded/isolated system, only the parameter 5308 is relevant.
The settings for the fuse failure monitor must be selected in such manner that reliable activation occurs if a
phase voltage fails, but that false activation does not occur during ground faults in a grounded network.
Address 5303
FUSE FAIL RESID
must be set as sensitive as required (with ground faults, below the smallest
fault current).
The FFM picks up if the ground voltage V
N
is higher than the set limit value under address 5302
FUSE FAIL
3Vo
and if the ground current IN lies below the set limit value under address 5303
FUSE FAIL RESID
.
In order to detect a three-phase failure, the progress in time of current and voltage is monitored. If the voltage
sinks below the threshold value without a change in the current value, a three-phase failure is detected. This
threshold value of the current element must be set under address 5308 FFM Idiff (3ph). The threshold value
should be identical with the definite time overcurrent protection.
Under address 5310
BLOCK PROT.
it can be determined whether the protection functions should be blocked
upon pickup by the FFM.
i
i
NOTE
The setting under address 5310
BLOCK PROT.
has no effect on the flexible protection functions. A sepa-
rate blocking can be selected for that purpose.
The function may be disabled in address 5301
FUSE FAIL MON.
, e.g. when performing asymmetrical tests.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
The table indicates region-specific presettings. Column C (configuration) indicates the corresponding secon-
dary nominal current of the current transformer.
Addr.
Parameter
C
Setting Options
Default Setting
Comments
5201
VT BROKEN WIRE
ON
OFF
OFF
VT broken wire supervision
5202
Σ V>
1.0 .. 100.0 V
8.0 V
Threshold voltage sum
5203
Vph-ph max<
1.0 .. 100.0 V
16.0 V
Maximum phase to phase
voltage
5204
Vph-ph min<
1.0 .. 100.0 V
16.0 V
Minimum phase to phase
voltage
2.12.1.9
Functions
2.12 Monitoring Functions
SIPROTEC 4, 7SJ62/64, Manual
191
C53000-G1140-C207-8, Edition 08.2016
Summary of Contents for SIPROTEC 4
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