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Siemens AG ⋅ January 1999
During a system fault (short-circuit in the protected
zone), the instantaneous values of the measured siĆ
gnals are stored in the device for a maximum period
of 5 s and are subsequently available for fault analyĆ
sis. For this purpose, the 7SD600 is equipped with an
RS485 interface with bus-capability so that, with the
DIGSI 3 operating program, user-friendly operation as
well as convenient and clear fault recording and evaĆ
luation is possible. The interface is also suited for
operation through a modem connection.
Both hardware and software are constantly monitored
in the device so that faults are detected and indicated
immediately. This ensures an extremely high level of
reliability and availability.
The device cannot operate in conjunction with 7SD24
or 7SD502 but must always be implemented in pairs.
The previously used summation transformer 4AM49
can continue to be used if the device used to replace
a 7SD24.
D Numerical device with powerful 16-bit microproĆ
cessor system;
D Complete numerical measured value processing
and control, from the sampling and digitization of
measured variables through to the trip decisions
for the circuit-breaker;
D Complete galvanic and interference-free isolation
of the internal processing circuits from the measuĆ
ring, control and supply circuits of the station and
the pilot wires by means of screened measured
value transducers, binary in and output modules
and DC converters;
D Self-contained measuring unit for each line end;
D Low demands on the current transformer;
D Comprehensive additional functions (see section
1.3);
D Continuous calculation and display of operational
measured values at the front of the device;
D Simple operation via integrated keypad and display
panel or via connected PC with DIGSI 3;
D Storage of fault events and instantaneous values
for disturbance recording;
D Data exchange with remote station via a symmeĆ
trical pilot wire pair; thus enabling implementation
of existing pilot wires;
D Communication with central control and storage
device via serial interface;
D Connection to fiber optic cable via external
RS485/opt. module
D Continuous monitoring of signal path and measuĆ
red signals, as well as all device hardware and
software;
D Simple installation and commissioning, integral
commissioning aids;
D Low maintenance.
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