Functions
6-170
7SJ63 Manual
C53000-G1140-C120-1
the data are stored for an adjustable period of time, but not more than 5 seconds. Up
to 8 fault records can be recorded in this buffer. The memory is automatically updated
with every new fault, so no acknowledgment for previously recorded faults is required.
Waveform capture can also be started with protection pickup, via binary input, via PC-
interface, or SCADA.
Using the PC-interface or the rear service port, data can be retrieved by a personal
computer and processed, using the protective data processing program DIGSI
®
4,
and the graphics program DIGRA
®
4. DIGRA
®
4 graphically prepares the data gener-
ated during the fault, and calculates additional quantities, such as impedance or rms
values, from the delivered measured values. The currents and voltages can be repre-
sented as primary or secondary quantities. In addition, relay sequence of events sig-
nals are recorded as well.
Fault data may be retrieved via the serial interface of a PC. Data evaluation is per-
formed by the PC using the respective programs. For this, the currents and voltages
are related to their maximum values, are standardized to the nominal value, and pre-
pared for graphical display. Additionally, events such as the pickup of a relay element
or the initiation of a trip signal can be displayed as well.
If configured in SCADA, data are transferred automatically to the SCADA computer.
6.19.4 Programming Settings
Average Calcula-
tion
The selection of the time period for measured value averaging is set at address
'0',QWHUYDO
. The first number specifies the averaging time window in minutes
while the second number gives the frequency of updates within the time window. A set-
ting of
0LQ6XEV
, for example, means that time average generation occurs
for all measured values that arrive within 15 minutes, and that output is updated three
times during the 15 minute window, or every 15/3 = 5 minutes.
The point in time where averaging begins (on the hour, on the half hour, etc.) is set at
address 8302
'0'6\QF7LPH
. If the settings for averaging are changed, then the
measured values stored in the buffer are deleted, and new results for the average cal-
culation are only available after the set time period has passed.
Minimum and
Maximum Values
The tracking of minimum and maximum values can be reset automatically at a pro-
grammable point in time. To select this feature, address 8311
0LQ0D[F\F5(6(7
should be set to
<HV
. The point in time when reset is to take place (the minute of the
day in which reset will take place) is set at address 8312
0L0D5(6(77,0(
. The
reset cycle in days is entered at address 8313
0L0D5(6(7&<&/(
, and the beginning
date of the cyclical process, from the time of the setting procedure (in days), is entered
at address 8314
0LQ0D[5(667$57
.
Limit Values
Phase currents and the averages of the currents and powers can be monitored. These
are stationary monitors that cannot be used as pre-warning levels by time-overcurrent
protection, for example. The percentages are relative to the nominal device quantities.
Furthermore, it is possible to monitor the power factor, and connected 20 mA values
(if any).
The settings are entered under
0($685(0(17
in the sub-menu
6(732,17609
by
overwriting the existing values.
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