Seg MRD1-T, Manual

Page: 4 / 64

4 TB MRD1-T 10.01 E
2 Features and Benefits
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
•
Fault Recorder for recording measured fault data
•
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
•
Indication of relay functions optically or via sepa-
rate self supervision relay
•
Three possibilities for relay resetting
•
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
•
Addition of further protection functions after installa-
tion of additional software modules
Transformer differential protection
•
Stabilization against transformer inrush and CT
saturation
•
Adaption to vector groups and transformation ratio
by means of software without additional interpos-
ing CTs
•
Compensation of tap changer position
•
Waveform recognition technique with a special
Fourier algorithm (inrush element)
•
No complete blocking of differential element but
only reduced sensivity
•
Independent High Set differential element for heavy
faults