Siemens siprotec 7SD5 User Manual page 419

Classification of Indications are classified as follows:
Indications
• Operational indications: messages generated while the device is in operation: They
• Fault indications: messages from the last eight network faults that were processed
• Statistic indications: they include a counter for the switching actions of the circuit
A complete list of all indications and output functions that can be generated by the
device, with the associated information number (No.), can be found in the Appendix.
The lists also indicate where each indication can be sent to. If functions are not present
in the specific device version, or if they are set to Disabled, then the associated in-
dications cannot appear.
Operational Operational indications contain information that the device generates during operation
Indications and about 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 capac-
ity of the memory is exhausted, the oldest indication is lost.
Operational indications arrive automatically and can be read out from the device
display or a personal computer at any time. Faults in the power system are indicated
with „Network Fault" and the present fault number. The fault indications contain de-
tailed information on the behaviour of the power system fault.
Fault Indications Following a system fault, it is possible, for example, to retrieve important information
regarding its progress, such as pickup and trip. The time the initial occurrence of the
short-circuit fault occurred is accurately provided via the system clock. The progress
of the disturbance is output with a relative time referred to the instant of fault detection,
so that the duration of the fault until tripping and up to reset of the trip command can
be ascertained. The resolution of the time information is 1 ms.
A system fault starts with the recognition of the fault by the fault detection, i.e. first
pickup of any protection function, and ends with the reset of the fault detection, i.e.
dropout of the last protection function. Where fault causes several protective functions
to pick up, the fault is considered to include all that occurred between pickup of the
first protective function and dropout of the last protective function.
If auto-reclosing occurs, then the network fault ends after the last reclosing shot, which
means after a successful reclosing or lockout. Therefore the entire clearing process,
including the reclosing shot (or all reclosing shots) occupies only one fault record.
Within a network fault, several fault records can occur (from the first pickup of a pro-
tective function to the last dropout of a protective function). Without auto-reclosing
each fault record represents a network fault.
Spontaneous After a fault, automatically and without operator action, the most important fault data
Indications from the general device pickup appear on the display in the sequence shown in the
following figure.
7SD5 Manual
C53000-G1176-C169-1
include information about the status of device functions, measurement data, system
data, and similar information.
by the device.
breakers initiated by the device, maybe reclose commands as well as values of in-
terrupted currents and accumulated fault currents.
2.24 Ancillary Functions
419