Control During Operation
7-137SA6 Manual
C53000-G1176-C156-2
7.1.2 Switching Statistics
The messages in switching statistics are counters for the accumulation of interrupted
currents by each of the breaker poles, the number of trips issued by the device to the
breaker. The interrupted currents are in primary terms.
Switching statistics can be viewed on the LCD of the device, or on a PC running
DIGSI
®
4 and connected to the operating or service interface.
A password is not required to read switching statistics; however, a password is re-
quired to change or delete the statistics.
In 7SA6 the statistics register the data of the protection communication. The transmis-
sion time of the information from device to device via protection data interfaces (com-
ing and going) is measured steadily and registered in the folder “Statistic”. The avail-
bility of the means of transmission is also indicated. The availability is indicated in %/
min and %/h. This enables the user to assess the transmission quality.
7.1.2.1 Viewing the Switching Statistics
For each trip command initiated by a protective element of the device, the magnitude
of interrupted current for each circuit breaker pole is determined and stored. The cur-
rent magnitudes are added to previously interrupted currents, and the accumulated
values are stored.
In devices with automatic reclosure the number of reclosure commands is counted,
i. e. separately according to single-pole (if available) and three-pole automatic reclos-
ure cycles as well as separately according to the first and all further automatic reclos-
ures.
The memories are protected against auxiliary voltage failure.
From the
DeviceFront
With a device ready for operation, first press the key. The MAIN MENU appears.
The first menu item
Annunciation is marked.
Press the key to enter the
ANNUNCIATION sub-menu (see Figure 7-1).
Usethe keytoselecttheitem
Statistic, and switch to the list of statistics values
using the key. The
STATISTIC list appears. See Figure 7-15.
Figure 7-15 Switching statistics viewed from the front display —example
From PC with
DIGSI
®
4
Under Annunciation (Figure 7-2), the switching statistics can be found by double
clicking. Double click on
Statistic. The contents of the statistic counters is dis-
played in another window. See Figure 7-16.
MENU
STATISTICS 1/05
---------------------
Σ IL1= 0.00kA
Σ IL2= 0.00kA
Etc.
:
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