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Product description
2
2 - 2
Siemens AG ⋅ May 1998
2.2 Features
D Powerful 32-bit microprocessor system
D Completely digital measured value processing and
control, from the aquisition and digitizing of meaĆ
sured values, recognition of the isolator status and
processing of the CB failure protection signals up
to the trip decisions for the circuit-breaker
D Easy menu-guided operation via integrated keypad
and display panel
D Storage of fault events as well as instantaneous
values for fault recording.
D Complete galvanic and disturbance-free isolation
between the internal processing circuits of master
unit and bay units and the measuring and auxiliary
supply circuits of the station by virtue of screened
measuring transducers, binary input and output
modules and DC converters.
D Disturbance-free and fast data transmission from
and to the bay units by fibre-optical links.
D Complete scope of functions for the selective proĆ
tection of multiple busbar systems.
D Central administration and feeder-dedicated indiĆ
cation of the isolator states.
D Continuous monitoring of measured values as well
as of hardware and software of the unit
D Comprehensive self-monitoring provides for fast
signalling of unit failure.
D Communication via the V.24 interface and utilizaĆ
tion of the program DIGSI for system configuraĆ
tion, settings, parameterizing and reading-out of
events and fault recordings.
D Commissioning support by means of measuring
and annunciation features.
2.3 Scope of functions
The numerical busbar protection contains the folloĆ
wing functions:
D Busbar protection with up to 12 bus zones, 12 bus
coupler sections (KS) and up to 48 bay units.
D Evaluation of the differential current in conjunction
with through-current stabilization (refer Fig 2.1).
D Tripping dependent on three independent meaĆ
surement decisions; 2 based on busbar configuraĆ
tion and 1 isolator-independent (check zone).
D Typical trip time <
15 ms.
D High stability even with very high short-circuit curĆ
rents and CT saturation.
D Zone-selective and phase-selective blocking of
the busbar protection by the differential current
monitor.
D Characteristics for check zone and bus-selective
zones can be set independently from each other.
D Matching to different CT ratios without intermediĆ
ate matching transformers.
D Selective clearance of short-circuits even on the
bypass bus with signal transmission to the remote
end.
D Detection and disconnection of short-circuits in
the coupler bay between current transformers and
circuit-breaker based on current measurement
and selective unbalance.
D Direct operation of the circuit breaker by the bay
unit.
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