Auxiliary Functions - Siemens SIPROTEC 7SA522 Manual

2 Functions
2.21

Auxiliary functions

2.21.1 Processing of Messages
2.21.1.1 Method of Operation
Displays and
Binary Outputs
(output relays)
Information on the
Integrated Display
(LCD) or to a Per-
sonal Computer
346
The additional functions of the 7SA522 distance protection relay include:
• processing of messages,
• processing of operational measured values,
• storage of fault record data.
After the occurrence of a system fault, data regarding the response of the protective
relay and the measured quantities should be saved for future analysis. For this reason
message processing is done in three ways:
Important events and states are displayed using front panel LEDs. The device further-
more has output relays for remote indication. Most indications and displays can be
configured differently to the delivery default settings (for information on the delivery
default setting see Appendix). The procedure is described in detail in the SIPROTEC
4 System Description, (order no. E50417-H1176-C151).
The output relays and the LEDs may be operated in a latched or unlatched mode
(each may be individually set).
The latched conditions are protected against loss of the auxiliary voltage. They are
reset
• On site by pressing the LED key on the relay,
• Remotely using a binary input configured for that purpose,
• Using one of the serial interfaces,
• Automatically at the beginning of a new pickup.
Status messages should not be stored. Also, they cannot be reset until the criterion to
be reported has been cancelled. This applies to e.g. messages from monitoring func-
tions, or the like.
A green LED displays operational readiness of the relay ("RUN"), and cannot be reset.
It goes out if the self-check feature of the microprocessor recognizes an abnormal oc-
currence, or if the auxiliary voltage fails.
When auxiliary voltage is present but the relay has an internal malfunction, the red
LED ("ERROR") lights up and the processor blocks the relay.
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DIGSI enables you to control selectively each output relay and LED of the device
and, in doing so, check the correct connection to the system. In a dialog box you can,
for instance, cause each output relay to pick up, and thus test the wiring between the
7SA522 and the station, without having to create the indications masked to it.
Events and conditions can be read out on the display on the front cover of the relay.
Using the front PC interface or the rear service interface, for instance, a personal com-
puter can be connected, to which the information can be sent.
In the quiescent state, i.e. as long as no system fault is present, the LCD can display
selectable operational information (overview of the operational measured values) (de-
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7SA522 Manual
C53000-G1176-C155-3