Information To A Substation Control Center; Statistics; Description - Siemens SIPROTEC 7SJ62 Manual

2.23.1.3 Information to a Substation Control Center

If the device has a serial system interface, stored information may additionally be transferred via this interface
to a centralized control and storage device. Transmission is possible via different transmission protocols.
2.23.2

Statistics

The number of trips initiated by the 7SJ62/64, the number of close commands initiated by the AR and the op-
erating hours under load are counted. An additional counter allows the number of hours to be determined in
which the circuit breaker is positioned in the „open" condition. Further statistical data can be gained to optimize
the intervals for circuit breaker maintenance.
Furthermore, if the device is utilized as motor protection, statistical values regarding the operation of the motor
as well as the last 5 motor startups are available.
The counter and memory levels are secured against loss of auxiliary voltage.
During the first start of the protection device the statistical values are pre-defined to zero.

2.23.2.1 Description

Number of Trips
In order to count the number of trips of 7SJ62/64, the 7SJ62/64 relay has to be informed of the position of the
circuit breaker auxiliary contacts via binary inputs. Hereby, it is necessary that the internal pulse counter is al-
located in the matrix to a binary input that is controlled by the circuit breaker OPEN position. The pulse count
value "Number of TRIPs CB" can be found in the "Statistics" group if the option "Measured and Metered Values
Only" was enabled in the configuration matrix.
Number of Automatic Reclosing Commands
The number of reclosing commands initiated by the automatic reclosing function is summed up in separate
counters for the 1st and ≥ 2nd cycle.
Operating Hours
The operating hours under load are also stored (= the current value in at least one phase is greater than the
limit value BkrClosed I MIN set under address 212).
Hours Meter "CB open"
A meter can be realized as a CFC application if it adds up the number of hours in state „Circuit Breaker open"
similarly to the operating hours meter. The universal hours meter is linked to a respective binary input and
counts if the binary input is active. Alternatively, the undershooting of the parameter value 212 BkrClosed I
MIN may be used as a criterion for starting the meter. The meter can be set or reset. A CFC application example
for such meter is available on the Internet (SIPROTEC Download Area).
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
Functions
2.23 Auxiliary Functions
339