4
TB MRD1-G 11.01 E
2
Features and Characteristics
Basic Unit
Standard equipment
•
Modular design
with automatic short circuiting C.T.-inputs
•
Signal and data processing in a separate digital
signal processor (32 samples per cycle)
•
Digital filtering of measured quantities
•
Three possibilities of parameter setting and data
calling:
1) keyboard and display
2) RS232 interface at the front (lap top)
3) RS485 interface for integration into control
systems at the rear
•
Safety interlocking preventing parameter setting via
different ways at the same time
•
extensive internal plausibility check of modified pa-
rameters
•
Event Recorder for recording system messages
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Fault Recorder for recording measured fault data
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Four programmable independent parameter sets
•
Non-volatile memory for parameter sets, events and
fault data
•
Indication of measured operational values and re-
sulting quantities
•
Wide-ranging automatic self-tests
•
Small relay size
•
Three possibilities for relay resetting
•
Indication of relay function optically or via separate
selfsupervision relay
•
All data interfaces galvanical isolated
•
Rated frequency selectable: 50 Hz/60 Hz
•
Parameter setting protected by password
Functions which can be programmed by the user :
•
Protection and system parameters
•
Latched position or minimal signal duration for
each of the output relays
Optional equipment
•
CAN Bus
•
FO connection (fibre optic) for RS485 interface
•
Disturbance recorder on PCM card
•
Addition of further protection functions after installa-
tion of additional software modules
Generator differential protection
•
Stabilization against CT measuring errors
•
No complete blocking of differential element but
only reduced sensivity
•
Independent High Set differential element for heavy
faults
