Seg MRU3-1, Руководство пользователя

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TB MRU3-1 12.00 E 3
1 Introduction and application
The voltage supervision relay MRU3-1 protects electri-
cal power generators, consumers or operating com-
ponents generally against over- or undervoltages.
Among other applications the relay can be used:
•
for detection of over- or undervoltages in power gen-
rating plants and energy supply systems
•
to protect generators against critical overvoltages in
case of defective voltage regulators
•
as undervoltage protection for motors
•
as generator stator earth fault protection
•
as over- and undervoltage protection with evaluating
the symmetrical components (
MRU1-2
, detailed in-
formation on this type can be found in the relevant
technical description)
There is also a similar protection relay IRU1 available
in a more simpler design, i.e. with less function, with-
out display and without serial interface.
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,
•
two parameter sets,
•
voltage supervision each with two step under-/ and
overvoltage detection,
•
Completely independent time settings for voltage su-
pervision
•
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
•
1-phase or 3-phase tripping criterion for the U</U>
step,
•
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,
•
serial data exchange via RS485 interface possible;
alternatively with SEG RS485 Pro-Open Data Proto-
col or Modbus Protocol.