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7SV512
V1
4.5
Ancillary functions
The ancillary functions of the circuit breaker failure
protection 7SV512 include:
--- Processing of annunciations,
--- Storage of short circuit data for fault recording,
--- Operational measurements and testing routines,
--- Monitoring functions.
4.5.1
Processing of annunciations
After a fault in the network system, information con-
cerning the response of the protective device and
knowledge of the measured values are of impor-
tance for an exact analysis of the history of the fault.
For this purpose the device provides annunciation
processing which is effective in three directions.
4.5.1.1
Indicators and binary outputs
(signal relays)
Important events and conditions are indicated by
optical indicators (LED) on the front plate. The mod-
ule also contains signal relays for remote signalling.
Most of the signals and indications can be mar-
shalled, i.e. they can be allocated meanings other
than the factory settings. In Section 5.5 the delivered
condition and the marshalling facilities are de-
scribed in detail.
The output signal relays are not latched and auto-
matically reset as soon as the originating signal dis-
appears. The LEDs can be arranged to latch or to be
self-resetting.
The memories of the LEDs can be safe against sup-
ply voltage failure. They can be reset:
--- locally, by operation of the reset button on the
relay,
--- remotely by energization of the remote reset in-
put,
--- automatically, on occurrence of a new general
pick-up signal.
C53000---G1176---C91
Some indicators and relays indicate conditions; it is
not appropriate that these should be stored. Equally
they cannot be reset until the originating criterion
has been removed. This mainly concerns fault indi-
cations such as "auxiliary voltage fault", etc.
A green LED indicates readiness for operation. This
LED cannot be reset and remains illuminated when
the microprocessor is working correctly and the unit
is not faulty. The LED extinguishes when the self-
checking function of the microprocessor detects a
fault or when the auxiliary voltage is absent.
With the auxiliary voltage present but with an exist-
ing internal fault in the unit, a red LED illuminates
("Blocked") and blocks the unit.
4.5.1.2
Information on the display panel or to
a personal computer
Events and conditions can be read off in the display
on the front plate of the device. Additionally, a per-
sonal computer, for example, can be connected via
the operation interface, and all the informations can
then be sent to it.
In the quiescent state, i.e. as long as no network
faults are present, the display outputs selectable op-
erating information (usually an operational mea-
sured value) in each of the two lines. In the event of a
network fault, selectable information on the fault ap-
pears instead of the operating information, e.g. de-
tected phase(s) and elapsed time from fault detec-
tion to trip command. The quiescent information is
displayed again once these fault annunciations
have been acknowledged. The acknowledgement
is identical to resetting of the stored LED displays as
in Section 4.5.1.1.
The device also has several event buffers, e.g. for
operating messages, circuit breaker operation sta-
tistics etc. (refer Section 6.4) which can be saved
against supply voltage failure by a buffer battery.
These messages, as well as all available operating
values, can be transferred into the front display at
any time using the keyboard or to the personal com-
puter via the operating interface.
After a fault, for example, important information con-
cerning its history, such as pick-up and tripping, can
be called up on the display of the device.
Method of operation
37
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