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Classification of Indications
Indications are classified as follows:
• Operational indications: messages generated while the device is in operation: They include information
about the status of device functions, measurement data, system data, and similar information.
• Fault indications: messages from the last eight system faults that were processed by the device..
• Indications on Statistics: they include counters for the switching actions of the circuit breakers initiated by
the device, maybe reclose commands as well as values of interrupted currents and accumulated fault cur-
rents.
A complete list of all indications and output functions generated by the device with the associated information
number (No.) can be found in the Appendix. This list also indicates where each indication can be sent. If certain
functions are not avaiable in a device version with reduced function scope or if they are configured as in the
function scope, then the associated indications will not appear.
Operational Indications
Operational indications contain information generated by the device during operation about operational condi-
tions.
Up to 200 operational indications are recorded in chronological order in the device. Newly generated indica-
tions are added to those already present. If the maximum capacity of the memory has been exceeded, the
oldest indication will be overwritten.
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 detailed information on the response during system faults.
Fault Indications
Following a system fault it is possible to retrieve important information regarding its progress, such as pickup
and trip. The system clock accurately provides the absolute time when the fault first occurred. The fault pro-
gression is output with a relative time referred to the instant of pickup so that the time until tripping and until
reset of the trip command can be recognized. The resolution of the time information is 1 ms.
A system fault starts with the recognition of a fault by the fault detection, i.e. first pickup of any protection func-
tion, and ends with the reset of the fault detection, i.e. dropout of the last protection function. Where a fault
causes several protection functions to pick up, the fault is considered to include all that occurred between
pickup of the first protection function and dropout of the last protection function.
If automatic reclosure is performed, the network fault ends after the last blocking time has expired, thus after a
successful or unsuccessful reclosure. Therefore the entire clearing process, including the reclosure cycle shot
(or all reclosure cycles), occupies only one fault log. Within a network fault, several faults can occur (from the
first pickup of a protection function to the dropout of the last pickup). Without automatic reclosure each fault
represents a network fault.
Spontaneous Indications
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 2-236
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
Spontaneous fault indication display
Functions
2.26 Additional Functions
469
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