2.35 Ancillary Functions
209
7UM61 Manual
C53000-G1176-C127-3
The device is equipped with several event buffers, for operational messages, circuit
breaker statistics, etc., which are protected against loss of the auxiliary voltage by a
buffer battery. These indications can be displayed on the LCD at any time by keypad
selection, or transferred to the PC via the serial service. Readout of indications during
operation is described in detail in the SIPROTEC 4 System Description /1/.
Classification of Indications
Indications are categorised as follows:
• Operational indications; these are generated while the device is operating: Informa-
tion regarding the status of device functions, measured data, power system data,
control command logs etc.
• Fault indications: indications from the last 8 network faults that were processed by
the device.
• Indications on "Statistics": they include a counter for the trip commands initiated by
the device, possibly reclose commands as well as values of interrupted currents
and accumulated fault currents.
A complete list of all indication and output functions that can be generated in a device
configured for the maximum scope of functions is contained in the Appendix, together
with their information number (FNo.). It also indicates where each indication can be
sent to. If functions are not present in a not fully equipped version of the device, or are
configured to Disabled, then the associated indications cannot appear.
Operational Indications
The operational indications contain information that the device generates during oper-
ation and on operational conditions. Up to 200 operational indications are recorded in
chronological order in the device. Newly generated indications are added to those
already there. If the maximum capacity of the memory is exhausted, the oldest indica-
tion is lost.
Fault Events
After a fault on the system, for example, important information about the progression
of the fault can be retrieved, such as the pickup or initiation of a trip signal. The initial
time of the short-circuit fault is allocated the internal absolute system clock time. The
course of the disturbance is output with a relative time referred to the pickup instant,
so that the duration until tripping and up to reset of the trip command can be ascer-
tained. The resolution of the time information is 1ms.
Spontaneous Indica-
tions on the Device
Front
After a fault, automatically and without operator action, the most important fault data
from the general device pickup appear on the display in the sequence shown in the
following figure.
Figure 2-79 Display of Spontaneous Annunciations in the Device Display
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