' $ ! $!& #$"&&"! Ċ (%& !' $$ !"
4 - 16
Siemens AG ⋅ January 1999
the trip command to be recognized. The resolution of
the real time is 1 ms.
Using the PC and the protection data processing proĆ
gram DIGSIR, events can also be read out, thus offeĆ
ring convenient screen visualization and menu-assiĆ
sted operation. The data can be either printed out or
stored in a file.
The protection device stores the events of the preĆ
vious eight system disturbances; in the event of a
ninth fault, the oldest event in the fault memory is
deleted and overwritten.
A system disturbance starts with the protection funcĆ
tion fault pick-up, and ends with the fault detector
reset of the last fault. A system fault can also comĆ
prise more than one incident (from fault detection
pick-up to fault detection drop-off).
The instantaneous values of measured signals
i
1
,i
diff
,i
stab
are sampled at an interval of 1Ăms (at 50ĂHz) or
0.83Ăms (at 60ĂHz) and stored in a cyclic buffer. In the
event of a fault, the data is stored for a settable peĆ
riod, but maximally 5Ăseconds. Up to 8Ădisturbances
can be stored. The disturbance record memory is auĆ
tomatically updated in the event of a new incident, so
that acknowledgement is not necessary.
Data can be read from a PC via the operator interface
and processed using the protection data processing
program DIGSIR. Graphical representation of the curĆ
rents is possible. In addition, signals are logged as
binary markers (tags), e.g. "starting" and "tripping".
The r.m.s. values of the currents
1
,
2
,
D
,
S
are perĆ
manently available and may be retrieved as long as
there is no trip pending.
7SD600 allows the interrogation of the switching staĆ
tes of all binary inputs and outputs. The start of the
interrogation is initiated from the operator keypad or
via the operator interface.
Following the start of the state interrogation, the curĆ
rent switching states of all binary inputs, all signal and
command relays and all LEDs can displayed consecuĆ
tively.
7SD600 is equipped with comprehensive monitoring
functions which cover device hardware as well as
software.
The device is monitored from measurement inputs
through to the command relays. Monitoring circuits
and processor check the hardware for faults and non-
permissible conditions. These include the following
D Auxiliary and reference voltages:
Power failure or disconnection of the supply volĆ
tage shuts down the device; an indication may be
issued by means of the idle state of a suitably
marshalled relay. Short-time interruptions (<50
ms) of the auxiliary supply voltage do not influence
the operation of the device (for nominal auxiliary
supply voltage
y 110 V).
To Next Page
Loading...
Need help?
General
