Function Description - Siemens SIPROTEC 7SA522 Manual

2 Functions

2.21.2.1 Function Description

Counters and
Memories
Number of Trips
Number of Auto-
matic Reclosing
Commands
Breaking Currents
Transmission Sta-
tistics
2.21.2.2 Setting Notes
Reading/Set-
ting/Resetting
2.21.2.3 Information List
No. Information
1000 # TRIPs=
1001 TripNo L1=
1002 TripNo L2=
1003 TripNo L3=
Σ IL1
1027 =
350
The counters and memories of the statistics are saved by the device. Therefore, the
information will not get lost in case the auxiliary voltage supply fails. The counters,
however, can be reset to zero or to any value within the setting range.
They can be viewed on the device front and read out using the DIGSI
a PC via the operator or service interface.
A password is not required to read counter and stored values but it is necessary to
change or delete them. You will find further details in the SIPROTEC
scription (Order no. E50417-H1176-C151)
The number of trips initiated by the device 7SA522 are counted. If the device is
capable of single-pole tripping, a separate counter for each circuit breaker pole is pro-
vided.
If the device is equipped with the integrated automatic reclosure, the automatic close
commands are also counted, separately for reclosure after single-pole tripping, after
three-pole tripping as well as separately for the first reclosure cycle and other reclo-
sure cycles.
Following each trip command the device registers the value of each current phase that
was switched off in each pole. This information is then provided in the trip log and sum-
mated in a register. The maximum current that was switched off is also stored. Mea-
sured values are indicated in primary values.
In 7SA522 the protection communication is registered in statistics. The delay times of
the information between the devices via interfaces (transmit and receive) are mea-
sured continuously. The values are kept stored in the Statistic folder. The availability
of the transmission media is also specified. The availability is indicated in % / min and
% / h. This enables an evaluation of the transmission quality.
®
The SIPROTEC 4 System Description describes how to read out the statistical
counters via the device front panel or DIGSI
counters takes place under the menu item Annunciation -> STATISTIC by overwrit-
ing the counter values displayed.
Type of In-
formation
OUT
OUT
OUT
OUT
OUT
®
. Setting or resetting of these statistical
Comments
Number of breaker TRIP commands
Number of breaker TRIP commands L1
Number of breaker TRIP commands L2
Number of breaker TRIP commands L3
Accumulation of interrupted current L1
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4 software on
®
4 System De-
7SA522 Manual
C53000-G1176-C155-3