Seg HighTECH MRU3-2, Руководство пользователя

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TB MRU3-2 12.00 E 3
1 Introduction and application
The MRU3-2 is a relay for voltage supervision with
universal application, it protects the three-phase net-
work against voltage unbalance or earthfaults in iso-
lated networks. Beside the pure rms value measure-
ment of the line voltage the
MRU3-2 evaluates the
symmetrical components (positive-, negative- and zero
sequence system). By evaluating these components re-
lay
MRU3-2 can detect the phase sequence, voltage
unbalance and earthfaults.
Important:
For additional common data of all MR -relays please
refer to technical description " MR - Digital Multifunc-
tional Relays".
2 Features and characteristics
•
Microprocessor technology with watchdog,
•
digital filtering of the measured values by using dis-
crete Fourier analysis to suppress higher harmonics
and d.c. components induced by faults or system
operations,
•
analog low pass filter,
•
two parameter sets,
•
voltage supervision each with two step under-/ and
overvoltage detection,
•
Voltage supervision for each phase separately
•
Completely independent time settings for voltage su-
pervision
•
separate tripping elements for over- and undervolt-
age and positive sequence system
•
overvoltage detection in negative- and zero se-
quence system,
•
display of measuring values of the line voltages and
system voltages U0, U1 and U2 as rms values
(zero-, positive- and negative sequence system)
•
alternatively connection and measurement of the
phase-to-neutral or phase-to-phase voltage
•
display of the phase sequence,
•
display of all measuring values and setting parame-
ters for normal operation as well as tripping via a
alphanumerical display and LEDs,
•
display of measuring values as primary quantities,
•
tripping memory for all line voltages and the volt-
ages of the symmetrical components,
•
storage and display of tripping values in a fault
memory (voltage-failure safe),
•
recording of up to eight fault occurences with time
stamp
•
for blocking the individual functions by the external
blocking input, parameters can be set according to
requirement,
•
suppression of indication after an activation
(LED flash),
•
free assignment for output relays,
•
display of date and time,
•
in complience with VDE 0435, part 303 and IEC
255,
•
mains frequency is adjustable to 50 Hz or 60 Hz or
variable from 40 - 70 Hz,
•
RS485 interface for communication with master sys-
tems
•
serial data exchange via RS485 interface possible;
alternatively with SEG RS485 Pro-Open Data Proto-
col or Modbus Protocol.