Functions
2.49 Auxiliary Functions
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
331
Statistics
The annunciations in statistics are counters for breaker switching operations instigated by the 7UM62 as well
as for accumulation of short-circuit currents involved in disconnections caused by the device protection func-
tions. The interrupted currents are in primary terms.
Statistics can be viewed on the LCD of the device, or on a PC running DIGSI, and connected to the operator
or service interface.
A password is not required to read counter and stored values but is required to change or delete them.
Information to a Control Centre
If the device has a serial system interface, stored information may additionally be transferred via this interface
to a centralised control and storage device. Transmission is possible via different transmission protocols.
2.49.2 Statistics
The trip commands initiated by the device are counted. Currents of the last disconnections initiated by the
device are recorded. Disconnected fault currents are accumulated for each breaker pole.
2.49.2.1 Functional Description
Number of Trips
The number of trips initiated by the 7UM62 is counted, as long as the position of the circuit breaker is monitored
via breaker auxiliary contacts and binary inputs. To use this function, the internal pulse counter „#of TRIPs=“
has to be masked in the matrix to a binary input that is controlled by the circuit breaker OPEN position. The
pulse metered value „#of TRIPs=“ can be found in the "Statistics" group if the option "Measured and
Metered Values Only" was enabled in the configuration matrix.
Switch-Off Values (at Trip)
Additionally, the following switch-off values appear in the fault indications for each trip signal:
• If earth differential protection is configured, an indication „I0-Diff:“ and „I0-Stab:“ is issued in I/I
nO
.
• the total of the primary fault currents per phase and side in kA
• the primary currents in all three phases in kA, individually for side 1 and side 2
• If differential protection is configured, the differential and stabilization (restraint) currents of all three phases
are indicated.
• the three phase-to-earth voltages in kV
• primary active power P in MW (precisely averaged power)
• primary reactive power Q in MVAR (precisely averaged power)
• Frequency in Hz
Operating Hours
The operating hours under load are also stored (= current value in at least one phase is greater than the limit
value BkrClosed I MIN set under address 281) are also accumulated.
To Next Page
Loading...
