Siemens siprotec 7SA522, User Manual

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Functions
6-246
7SA522 Manual
C53000-G1176-C119-2
6.18 Supplementary Functions
The auxiliary functions of the 7SA522 relay include:
•
processing of messages,
•
processing of operational measured values,
•
storage of fault record data.
6.18.1 Processing of Messages
For the detailed fault analysis, the information regarding the reaction of the protection
device and the measured values following a system fault are of interest. For this pur-
pose, the device provides information processing which operates in a threefold man-
ner:
Indicators (LEDs)
and Binary Outputs
(Output Relays) Important events and states are indicated with optical indicators (LED) on the front
plate. The device furthermore has output relays for remote indication. Most of the sig-
nals and indications can be marshalled, i.e. routing can be changed from the preset-
ting with delivery. In Section 5.2 the state of the delivered relay (presetting) and mar-
shalling facilities are extensively discussed.
The output relays and the LEDs may be operated in a latched or unlatched mode
(each may be individually set).
The latched state is saved against loss of auxiliary supply. It is reset:
−
locally by operation of the key LED reset on the front of the device,
−
from remote via a binary input,
−
via one of the serial interfaces,
−
automatically on detection of a new fault.
Condition messages should not be latched. Also, they cannot be reset until the crite-
rion to be reported has reset. This applies to e.g. messages from monitoring functions,
or similar.
A green LED indicates that the device is in service (“RUN”); it can not be reset. It ex-
tinguishes if the self-monitoring of the microprocessor recognizes a fault or if the aux-
iliary supply fails.
In the event that the auxiliary supply is available while there is an internal device fail-
ure, the red LED (“ERROR”) is illuminated and the device is blocked.
Information on the
Integrated Display
(LCD) or to a
Personal Computer Events and states can be obtained from the LCD on the front plate of the device. A
personal computer can be connected to the front interface or the service interface for
retrieval of the information.
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). In
the event of a system fault, information regarding the fault, the so-called spontaneous
messages, are displayed instead. The quiescent state information is displayed again
once the fault messages have been acknowledged. The acknowledgement is identical
to the resetting of the LEDs (see above).